Full Transcript
https://www.youtube.com/watch?v=ylaCYUME8SY
[00:00] hello and welcome to your practices
[00:05] hello and welcome to your practices webinar on advanced packaging
[00:08] webinar on advanced packaging I'm Ramsey Celine your practice lead
[00:11] I'm Ramsey Celine your practice lead Tindall National Institute where we
[00:14] Tindall National Institute where we focus on system integration and advanced
[00:16] focus on system integration and advanced photonics packaging this webinar
[00:19] photonics packaging this webinar continues our series where we step into
[00:21] continues our series where we step into the world of advanced photonics
[00:23] the world of advanced photonics packaging and with me today is my
[00:26] packaging and with me today is my co-host Francisco dr. Francesco Flores
[00:30] co-host Francisco dr. Francesco Flores head of the training programs hi
[00:32] head of the training programs hi Francisco I will say hi everybody
[00:35] Francisco I will say hi everybody we've also got Lucas agog Lia who is
[00:39] we've also got Lucas agog Lia who is helping develop our greeting coupler
[00:41] helping develop our greeting coupler technology here at Tyndall I look up I
[00:43] technology here at Tyndall I look up I run same and they're good to see you
[00:47] run same and they're good to see you both and so we've had three episodes
[00:50] both and so we've had three episodes dedicated to grating couplers and
[00:52] dedicated to grating couplers and today's episode is fourth as well so
[00:58] today's episode is fourth as well so Francesco how did we get here
[01:00] Francesco how did we get here?
[01:00] Well we started explaining the bra glow.
[01:05] Well we started explaining the bra glow that is the basis to understand the scattering process interaction between light and the device and with that we built the first type of grating coupler that is called standard grating cutler.
[01:21] There is this one so we saw that the pitch is constant and the catalytic efficiency around 50%.
[01:27] The next step per second episode on ready coupler we decided to focus on how to boost the coupling efficiency and we work mainly in two ways.
[01:40] The first one was we increase the amount of silicon on top of the grating Cutler the so called silicon over Larry in order to increase the scattering Sanford and the second idea was the application of the impedance.
[02:01] was the application of the impedance matching to light so the structure.
[02:05] matching to light so the structure became from standardized and we saw that.
[02:08] became from standardized and we saw that we were able to increase the coupling.
[02:10] we were able to increase the coupling efficiency up to 775.
[02:13] efficiency up to 775 percenter if you choose instead of the.
[02:16] percenter if you choose instead of the two hundred and twenty nanometers that.
[02:18] two hundred and twenty nanometers that 140 nanometer platform you can boost the.
[02:21] 140 nanometer platform you can boost the cutting efficiency up to eighty.
[02:23] cutting efficiency up to eighty eighty-five percent the third episode.
[02:26] eighty-five percent the third episode was focused mainly on Lucas work and the.
[02:32] was focused mainly on Lucas work and the particle swarm optimization procedure.
[02:34] particle swarm optimization procedure that we built customized here in Tyndall.
[02:38] that we built customized here in Tyndall and mainly it's a routine that can use.
[02:41] and mainly it's a routine that can use inside an FD Gigi method and you can use.
[02:47] inside an FD Gigi method and you can use has we so the main parameters of the.
[02:51] has we so the main parameters of the braking Kuttner and you can leave them.
[02:53] braking Kuttner and you can leave them so the geometrical parameters you can.
[02:55] so the geometrical parameters you can link them to the losses channels.
[02:58] link them to the losses channels transmittance and reflectance and the.
[03:01] transmittance and reflectance and the coupling efficiency so the light that is.
[03:04] coupling efficiency so the light that is properly injected inside Gagan mode of.
[03:07] properly injected inside Gagan mode of the web data today we want to make.
[03:10] the web data today we want to make another step forward and we want to.
[03:13] another step forward and we want to analyze a little bit better let's say.
[03:16] analyze a little bit better let's say the concept that is behind this coupling.
[03:20] the concept that is behind this coupling efficiency so not only in terms of.
[03:22] efficiency so not only in terms of intensity 80 90 whatever you want.
[03:25] intensity 80 90 whatever you want percent but we want to link the coupling.
[03:28] percent but we want to link the coupling efficiency to the bank structure of the.
[03:31] efficiency to the bank structure of the grating coupler and then to the.
[03:33] grating coupler and then to the bandwidth so we can show that there is a.
[03:36] bandwidth so we can show that there is a link between the coupling efficiency and.
[03:38] link between the coupling efficiency and the bandwidth of the braking couplers so.
[03:41] the bandwidth of the braking couplers so in this case you can see for example the.
[03:42] in this case you can see for example the structure as a very fast filter and you.
[03:45] structure as a very fast filter and you can choose if you want need to boost.
[03:48] can choose if you want need to boost more the carbon efficiency or the.
[03:50] more the carbon efficiency or the bandwidth oh it sounds exciting I'm.
[03:55] bandwidth oh it sounds exciting I'm looking forward to hearing about that I.
[03:56] looking forward to hearing about that I reminder folks if you want to catch up.
[03:58] reminder folks if you want to catch up on any of these previous episodes that.
[04:00] on any of these previous episodes that Francesco was mentioning you can watch.
[04:04] Francesco was mentioning you can watch them on our Europe Rattus youtube.
[04:06] them on our Europe Rattus youtube channel so just search on youtube for.
[04:08] channel so just search on youtube for your practice and they'll be a few.
[04:10] your practice and they'll be a few different webinar series there it will.
[04:12] different webinar series there it will be under the advanced packaging webinar.
[04:16] be under the advanced packaging webinar series and remember if you have Q.
[04:18] series and remember if you have Q questions just use the Q&A button and.
[04:20] questions just use the Q&A button and we'll collect these questions and answer.
[04:23] we'll collect these questions and answer them in a dedicated Q&A.
[04:24] them in a dedicated Q&A session after the talk and so what will.
[04:27] session after the talk and so what will we learn today then look up so the topic.
[04:31] we learn today then look up so the topic of the day is Francesca already said the.
[04:33] of the day is Francesca already said the bandpass filter effect so we're gonna.
[04:36] bandpass filter effect so we're gonna see how we can manage the bandwidth why.
[04:41] see how we can manage the bandwidth why there is the difference in in the width.
[04:43] there is the difference in in the width of the bandwidth between a uniform and.
[04:45] of the bandwidth between a uniform and organized working copper and how if you.
[04:48] organized working copper and how if you want to look at it using either Fourier.
[04:51] want to look at it using either Fourier transform and the band structure concept.
[04:55] transform and the band structure concept go over to you share my screen so the.
[05:04] go over to you share my screen so the talk of today is divided into four main parts.
[05:08] there gonna be a general overview of on the problem in capping the light inside the photonic integrated circuit or pigs.
[05:15] and this is just a reminder of the importance of breaking copper in silicon photonics.
[05:27] and then we're gonna talk about briefly the structure of grating copper in order to make a bridge between this webinar and the previous one that was about the design routine that we used to optimize the protein coupler.
[05:39] and then we moved to the pass filter effects so what's the bandwidth while there is a difference between uniform and non-uniform working factor.
[05:44] and how we can study this is issue eventually there is the the Q&A session as as always.
[05:52] so as you know from the previous webinar grating coupler can be used to match the mode of the sources that we use to inject the light inside.
[06:06] that we use to inject the light inside the peak and the one sustained by the
[06:08] the peak and the one sustained by the wave guides of the pig itself and we can
[06:10] wave guides of the pig itself and we can overcome the mismatch between these two
[06:12] overcome the mismatch between these two modes quite efficiently so if you
[06:15] modes quite efficiently so if you remember we use the design routine
[06:17] remember we use the design routine explained in the last webinar to design
[06:19] explained in the last webinar to design grating copper and the final outcome of
[06:22] grating copper and the final outcome of the design routine was this final three
[06:26] the design routine was this final three dimensional grating cutter that we were
[06:28] dimensional grating cutter that we were able to import
[06:29] able to import inside 3d fdtd and using these monitors
[06:34] inside 3d fdtd and using these monitors we also are able to look at all the
[06:37] we also are able to look at all the parameter
[06:38] parameter very important from the propagation of
[06:40] very important from the propagation of the electromagnetic field so for example
[06:43] the electromagnetic field so for example the diffraction process that couples the
[06:45] the diffraction process that couples the light towards the wave get the focus in
[06:47] light towards the wave get the focus in here affect the ability of the grating
[06:49] here affect the ability of the grating in coupling the light inside the
[06:51] in coupling the light inside the fundamental mode of the of the waveguide
[06:54] fundamental mode of the of the waveguide and then how to manage the losses so the
[06:58] and then how to manage the losses so the transmitter monitor a reflector monitors
[07:00] transmitter monitor a reflector monitors to collect the light that his back
[07:01] to collect the light that his back reflect and transmitted through the
[07:03] reflect and transmitted through the grating and the coupling efficiency
[07:04] grating and the coupling efficiency monitor to collect the coupling
[07:06] monitor to collect the coupling efficiency spectrum and also in this efficiency spectrum and also in this case the bandwidth so we have two different type of grating couples.
[07:15] uniform grating couples that have a constant pitch and upward eyes or non-uniform grating cutter where the pitch is a linear function of the distance.
[07:24] so as you can see on the right there is a difference in the country and efficiency spectra from the peak point of view using non-uniform grating coupler we are able to boost the coupling efficiency at a certain in this case energy so pointing electron volt or 1550 nanometers and also we are in this case reducing the bandwidth so the amount of frequencies that we are able to inject efficiently inside the waveguide.
[07:54] not only this one we can also note that there is a difference in the shape so for the uniform grating copper the shape is uniform on the left and right part respect to the peak while for
[08:06] right part respect to the peak while for the appetizer 18 cutter there is a more gentle decay on the left side.
[08:11] gentle decay on the left side so for lower energies and a more sharp decay on the right part.
[08:15] lower energies and a more sharp decay on the right part and this is due to the bandpass filter effect.
[08:17] the right part and this is due to the bandpass filter effect so what we want to study today is why there is this reduction.
[08:20] bandpass filter effect so what we want to study today is why there is this reduction and why we see these different behaviors in the coupling efficiency spectra.
[08:25] reduction and why we see these different behaviors in the coupling efficiency spectra.
[08:26] behaviors in the coupling efficiency spectra so the first tool that we can use is the special Fourier transform of the electromagnetic field emitted by the grating.
[08:30] spectra so the first tool that we can use is the special Fourier transform of the electromagnetic field emitted by the grating.
[08:33] use is the special Fourier transform of the electromagnetic field emitted by the grating so practically what we can do is to use again fdtd put a monitor on top of our structure and collect the light that is emitted by the grating.
[08:35] the electromagnetic field emitted by the grating so practically what we can do is to use again fdtd put a monitor on top of our structure and collect the light that is emitted by the grating.
[08:38] grating so practically what we can do is to use again fdtd put a monitor on top of our structure and collect the light that is emitted by the grating then we can do the Fourier transform and what we have is basically the energies sustained by the structure.
[08:41] to use again fdtd put a monitor on top of our structure and collect the light that is emitted by the grating then we can do the Fourier transform and what we have is basically the energies sustained by the structure.
[08:43] of our structure and collect the light that is emitted by the grating then we can do the Fourier transform and what we have is basically the energies sustained by the structure.
[08:45] that is emitted by the grating then we can do the Fourier transform and what we have is basically the energies sustained by the structure as a function of the in-plane wave vector.
[08:47] can do the Fourier transform and what we have is basically the energies sustained by the structure as a function of the in-plane wave vector.
[08:50] have is basically the energies sustained by the structure as a function of the in-plane wave vector this is in accordance with the Bragg blue that is basically the law that we used to design grating copper that leaked the energies of the way length that we want to couple to the angle of incidence of the light that we are using to as a source.
[08:51] by the structure as a function of the in-plane wave vector this is in accordance with the Bragg blue that is basically the law that we used to design grating copper that leaked the energies of the way length that we want to couple to the angle of incidence of the light that we are using to as a source.
[08:53] as a function of the in-plane wave vector this is in accordance with the Bragg blue that is basically the law that we used to design grating copper that leaked the energies of the way length that we want to couple to the angle of incidence of the light that we are using to as a source.
[08:56] vector this is in accordance with the Bragg blue that is basically the law that we used to design grating copper that leaked the energies of the way length that we want to couple to the angle of incidence of the light that we are using to as a source.
[08:57] Bragg blue that is basically the law that we used to design grating copper that leaked the energies of the way length that we want to couple to the angle of incidence of the light that we are using to as a source.
[08:59] that we used to design grating copper that leaked the energies of the way length that we want to couple to the angle of incidence of the light that we are using to as a source.
[09:00] that leaked the energies of the way length that we want to couple to the angle of incidence of the light that we are using to as a source.
[09:02] length that we want to couple to the angle of incidence of the light that we are using to as a source.
[09:06] angle of incidence of the light that we are using to as a source so what we can
[09:10] are using to as a source so what we can see is that the width of the special
[09:12] see is that the width of the special Fourier transform for the unicrone
[09:14] Fourier transform for the unicrone grating copper is almost the same across
[09:16] grating copper is almost the same across the entire energy interval well for the
[09:19] the entire energy interval well for the appetizer 18 copper this is not true
[09:22] appetizer 18 copper this is not true anymore and what we can see is that at
[09:24] anymore and what we can see is that at the bottom so lower energies we have is
[09:26] the bottom so lower energies we have is blurring region that is wider and then
[09:29] blurring region that is wider and then the Fourier transform is squeezed at
[09:31] the Fourier transform is squeezed at higher energies so if you want to
[09:35] higher energies so if you want to compare these two object with the
[09:37] compare these two object with the coupling efficiency specter we can take
[09:39] coupling efficiency specter we can take a cross-section to look at the width of
[09:41] a cross-section to look at the width of this object and we take the
[09:44] this object and we take the cross-section at the value of KX or
[09:46] cross-section at the value of KX or in-plane wave vector equal one because
[09:48] in-plane wave vector equal one because this value is related to the angle of
[09:50] this value is related to the angle of incidence and to the way like that we
[09:52] incidence and to the way like that we use to design rating copper in this case
[09:54] use to design rating copper in this case 10 degrees and 1550 nanometers so if we
[09:59] 10 degrees and 1550 nanometers so if we take this cross section what we can see
[10:02] take this cross section what we can see is that we are able to calculate again
[10:05] is that we are able to calculate again the bandwidth using the same meter for
[10:09] the bandwidth using the same meter for the coupling efficiency spectra and also
[10:12] the coupling efficiency spectra and also we can see that there is a different.
[10:14] we can see that there is a different behavior around the peak so for the appetizer 18 cutter again we can see that is there is a gentle decay for lower energies and a sharp decay for our energies and it is related also to this image because we can see that for lower energies the Fourier transform is wider respect to the higher one but of course this is just a cross section in reality we are using the mode of a single mode fiber the fundamental mode as an incident beam and as you know the fundamental mode of the single mode fiber as a Gaussian shape so we can consider also the the Fourier transform of our source and we can take the overlap between the Fourier transform of the emission of the grating copper and the Fourier transform of our source and what we get is this green region here and we can see the same behavior that we saw before so for the uniform protein copper is free in region is more homogeneous while for the appetizer 18 Kapler there.
[11:15] while for the appetizer 18 Kapler there is always this blurry region for lower.
[11:17] is always this blurry region for lower energies that is related with this.
[11:19] energies that is related with this gentle decay in the fluid transform and.
[11:21] gentle decay in the fluid transform and in the coupling efficiency spectra so.
[11:24] in the coupling efficiency spectra so now this can be considered as in an.
[11:26] now this can be considered as in an indirect way to look at the energies.
[11:28] indirect way to look at the energies sustained by the structure and the wave.
[11:30] sustained by the structure and the wave vector now we want to move further what.
[11:33] vector now we want to move further what we can do is to look at a dispersion of.
[11:36] we can do is to look at a dispersion of the light inside this structure and what.
[11:38] the light inside this structure and what we can calculate it's basically the pen.
[11:41] we can calculate it's basically the pen structure again we can use the fdtd.
[11:44] structure again we can use the fdtd as a meter to evaluate the pen structure.
[11:47] as a meter to evaluate the pen structure we can set up our simulation a box with.
[11:50] we can set up our simulation a box with periodic boundary condition to mimic.
[11:53] periodic boundary condition to mimic just one period of the grating copper.
[11:55] just one period of the grating copper then we have dipoles inside the.
[11:58] then we have dipoles inside the simulation box website the mode of the.
[12:00] simulation box website the mode of the structure and the time monitor are used.
[12:02] structure and the time monitor are used to collect the electromagnetic field and.
[12:04] to collect the electromagnetic field and using a Fourier transform we are able to.
[12:07] using a Fourier transform we are able to look at the nodes sustained by the.
[12:09] look at the nodes sustained by the grating cutter.
[12:10] grating cutter this way we can rebuild the dispersion.
[12:13] this way we can rebuild the dispersion curve or the band structure however.
[12:16] curve or the band structure however there is a problem here.
[12:18] there is a problem here uniform grating copper are basically.
[12:21] uniform grating copper are basically photonic crystals one dimensional.
[12:22] photonic crystals one dimensional photonic crystal with the uniform pitch.
[12:25] photonic crystal with the uniform pitch so we are able to create work easily we.
[12:28] so we are able to create work easily we can say the band structure while the.
[12:30] can say the band structure while the same concept cannot be applied directly.
[12:32] same concept cannot be applied directly for appetizer 18 copper because because.
[12:34] for appetizer 18 copper because because we have a non-uniform structure but then.
[12:38] we have a non-uniform structure but then there is an easy way to also manage the.
[12:42] there is an easy way to also manage the band structure for this object here and.
[12:45] band structure for this object here and what we can do is basically first.
[12:49] what we can do is basically first calculate the band structure for the.
[12:51] calculate the band structure for the uniform grating copper and then we can.
[12:53] uniform grating copper and then we can again consider as you can see from this.
[12:57] again consider as you can see from this pink line in this plot the free.
[13:02] pink line in this plot the free transform of our incident beam and we.
[13:05] transform of our incident beam and we can set the overlap between the Fourier.
[13:08] can set the overlap between the Fourier transform of the incident beam and the.
[13:10] transform of the incident beam and the band structure around the energies.
[13:12] band structure around the energies linked to the working whalen in this.
[13:15] linked to the working whalen in this case again 1550.
[13:17] case again 1550 and we can see that variable checking.
[13:19] and we can see that variable checking these region here to really obtain the bandwidth value what we can do for the appetizer editing cutter is to consider this grating as made of different uniform grating and we can calculate the band structure at each period of non-uniform great encounter and at what we get is this graph on the right where we have a slightly more complicated situation we can say we have three different regions where we have what we call filter it out energies the bandwidth region and the spectrum of symmetry as you can see here we have multiple curves and these multiple curves are related to the period of the non-uniform grating copper so the blue line is the first tooth then we have the fifth the tenth and the 15 in this way.
[14:17] fifth the tenth and the 15 in this way we are covering basically the region.
[14:20] we are covering basically the region that our corrosion source our.
[14:23] that our corrosion source our fundamental mode fiber is striking so we.
[14:29] fundamental mode fiber is striking so we can say that the geometrical dimension.
[14:30] can say that the geometrical dimension of the mode shines the grating copper.
[14:36] of the mode shines the grating copper from the first period till the 15th so.
[14:41] from the first period till the 15th so if we consider the overlap again between.
[14:43] if we consider the overlap again between the special Fourier transform and the.
[14:46] the special Fourier transform and the these multiple band structure curves we.
[14:49] these multiple band structure curves we can again comprehend better the behavior.
[14:54] can again comprehend better the behavior of the Fourier transform and the.
[14:55] of the Fourier transform and the coupling efficiency spectral so first of.
[14:58] coupling efficiency spectral so first of all we can fix this first point here as.
[15:01] all we can fix this first point here as a hopper limit of our bandwidth so all.
[15:05] a hopper limit of our bandwidth so all the energies that are higher and greater.
[15:07] the energies that are higher and greater than this point cannot be coupled by the.
[15:11] than this point cannot be coupled by the grating itself because they are filtered.
[15:14] grating itself because they are filtered by these matching impedance matching.
[15:17] by these matching impedance matching that we have in this type of structure
[15:19] that we have in this type of structure due to the despairing pitch across the
[15:22] due to the despairing pitch across the grating cutter then we have the
[15:25] grating cutter then we have the bandwidth region where the lower limit
[15:27] bandwidth region where the lower limit is fixed at
[15:29] is fixed at - and this is because basically the
[15:32] - and this is because basically the center of gravity of our corrosion mode
[15:35] center of gravity of our corrosion mode that is striking the grating coupler
[15:37] that is striking the grating coupler shines on the test - so the majority of
[15:40] shines on the test - so the majority of the energies are coupled in this region
[15:44] the energies are coupled in this region of the grating cutter and then we have
[15:47] of the grating cutter and then we have the spectrum asymmetry region so in this
[15:50] the spectrum asymmetry region so in this case we don't have anymore a fixed limit
[15:54] case we don't have anymore a fixed limit like in the upper limit here all these
[15:56] like in the upper limit here all these energies the final region that can be
[15:58] energies the final region that can be coupled inside the grating so here we
[16:01] coupled inside the grating so here we can consider that the tail of the
[16:03] can consider that the tail of the Gaussian node that is striking the first
[16:05] Gaussian node that is striking the first till the 9th two are coupled inside the
[16:08] till the 9th two are coupled inside the grating coupler and this gives is more
[16:13] grating coupler and this gives is more gentle decay a lens sharp respect to
[16:16] gentle decay a lens sharp respect to this right part where we have a fixed
[16:18] this right part where we have a fixed point and we can see this behavior.
[16:22] point and we can see this behavior inside the coupling efficiency spectrum.
[16:25] inside the coupling efficiency spectrum so in the end we saw how to start.
[16:29] so in the end we saw how to start grating coppers and the first thing that.
[16:33] grating coppers and the first thing that we can do is to look at the coupling.
[16:34] we can do is to look at the coupling efficiency spectrum so we can get the.
[16:38] efficiency spectrum so we can get the efficiency of our structure at the.
[16:41] efficiency of our structure at the working whaling and also the bandwidth.
[16:43] working whaling and also the bandwidth then if we want to study more deeply the.
[16:46] then if we want to study more deeply the behavior of the structure and while we.
[16:48] behavior of the structure and while we have different cutting efficiency.
[16:50] have different cutting efficiency spectra with different characteristics.
[16:52] spectra with different characteristics we can use Fourier transform and the.
[16:55] we can use Fourier transform and the band structure moreover we can also try.
[16:58] band structure moreover we can also try to put these two tool the Fourier.
[17:01] to put these two tool the Fourier transform and the band structure inside.
[17:03] transform and the band structure inside the design routine in order to try to.
[17:06] the design routine in order to try to gain control also on the bandwidth and.
[17:08] gain control also on the bandwidth and not only on the amount of light that.
[17:10] not only on the amount of light that we're able to inject inside the.
[17:12] we're able to inject inside the waveguide so this concludes the today's.
[17:16] waveguide so this concludes the today's topics I hope that it was clear and
[17:18] topics I hope that it was clear and interesting Ramsey before I was very interesting Ramsey before I was very interested for jump into it remind folks.
[17:26] interested for jump into it remind folks that there are webinar series and there'll be other talks coming up on different topics.
[17:36] different topics in fact the next couple of episodes Francesco remind us what they're going to be about.
[17:43] yeah we are organizing two more webinars that we have called a special summer session with partners that we are working in with and the first one will be in two weeks in July and the presenter will be dr. Kalam Little John from cornerstone but actually is a HW rod.
[18:13] so we really really interesting and actually we are working with them on our rating Cutler structures so in this case.
[18:19] rating Cutler structures so in this case we are jumping from the let's say design.
[18:23] we are jumping from the let's say design to the so called foundry perspective so.
[18:27] to the so called foundry perspective so the idea is to show how these breaking.
[18:29] the idea is to show how these breaking calculus can be realized and eventually.
[18:33] calculus can be realized and eventually measure and in the last episode the.
[18:36] measure and in the last episode the third week of July we will show you how.
[18:39] third week of July we will show you how to put together several device several.
[18:42] to put together several device several of these let's say building blocks in.
[18:45] of these let's say building blocks in order to realize a working device so.
[18:48] order to realize a working device so something that you can really use super.
[18:51] something that you can really use super cool so when the next episode then is on.
[18:55] cool so when the next episode then is on Tuesday the 7th of July and as you hear.
[18:59] Tuesday the 7th of July and as you hear there from Francisco for the first time.
[19:01] there from Francisco for the first time you'll hear about packaging from the.
[19:03] you'll hear about packaging from the foundries perspective and and if you.
[19:08] foundries perspective and and if you want to access some of our technology.
[19:10] want to access some of our technology our packaging techniques that's.
[19:12] our packaging techniques that's available to you through your practice.
[19:14] available to you through your practice you can get in touch with us you go to.
[19:16] you can get in touch with us you go to the website and check it out or you can.
[19:18] the website and check it out or you can get in touch with us at your practice.