BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20260308T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20261101T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260414T215541Z UID:E9613BC6-D7F7-41F4-96BD-91D44D6CE7B1 DTSTART;TZID=America/New_York:20260414T153000 DTEND;TZID=America/New_York:20260414T170000 DESCRIPTION:This seminar will include three UVA graduate student talks. One from MTT-S UVA Chapter on FMCW research and the other two from IEEE Photo nics UVA Chapter.\n\nFMCW Radar: From Chirp Waveform to System Architectur e and Applications\nMohan Zhao - University of Virginia\nFMCW radar enable s simultaneous range and velocity measurement through a simple continuous- wave architecture\, making it the dominant sensing modality in automotive\ , healthcare\, and industrial applications. This talk covers the essential s: the linear chirp waveform and beat frequency derivation\, the RF transc eiver chain from PLL/VCO through mixer and ADC front-end\, the signal proc essing pipeline (range/Doppler FFT\, CFAR\, angle estimation)\, and a surv ey of application domains including 77 GHz automotive MIMO radar\, non-con tact vital sign monitoring\, and emerging mmWave imaging systems. Hardware design trade-offs — phase noise\, chirp linearity\, mixer IIP3 — and their impact on radar performance will be emphasized throughout.\n\nThin a bsorber AlInAsSb 2-μm SACM APDs with photon-trapping gratings\nHannaneh K arimi - University of Virginia\nIn the extended short-wavelength infrared (eSWIR) spectral window\, high-sensitivity detectors are key components fo r various low-light-level imaging and sensing applications\, including eye -safe LIDAR. This talk presents low-room-temperature dark-current AlxIn1-x AsySb1-y avalanche photodiodes (APDs) that operate at 2 µm by using a thi n absorber. To compensate for the low external quantum efficiency (EQE) in thin absorbers\, we have fabricated 2D metal grating structures on SACM A PDs with absorber layers ranging from 50 to 400 nm. We have resolved the i ssue of non-vertical side-wall angles in fabricated nanopillars by overcoa ting the sample with an index-matching liquid. Additionally\, the highest EQE was achieved by optimizing the input polarization. The Noise Equivalen t Power (NEP) results of the designed structure are comparable to the HgCd Te at a temperature of 200K.\n\nHeterogeneous Integration of Photodiodes o n Thin-Film Lithium Niobate Waveguides\nMohammadhassan Maghsoudian - Unive rsity of Virginia\nWe present heterogeneously integrated photodiodes on th in-film lithium niobate with low dark current and a responsivity of 0.3 A/ W for a 10 × 20 µm² active area\, making them ideal for high-bandwidth applications.\n\nSpeaker(s): Hannaneh Karimi\, Mohammad Maghsoudian\, Moha n Zhao\n\nRoom: E-316\, Bldg: Thornton\, 85 Engineers Way\, Charlottesvill e\, Virginia\, United States\, 22904 LOCATION:Room: E-316\, Bldg: Thornton\, 85 Engineers Way\, Charlottesville\ , Virginia\, United States\, 22904 ORGANIZER:xgr6ku@virginia.edu SEQUENCE:21 SUMMARY:Student Spotlight Seminar MTT-S/Photonics URL;VALUE=URI:https://events.vtools.ieee.org/m/545973 X-ALT-DESC:Description: <br /><p><span style="font-family: arial\, helvetic a\, sans-serif\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;">This seminar w ill include three UVA graduate student talks. One from MTT-S UVA Chapter o n FMCW research and the other two from IEEE Photonics UVA Chapter.</span>< br><br></p>\n<div class="x_elementToProof"><span style="font-family: arial \, helvetica\, sans-serif\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;"><st rong>FMCW Radar: From Chirp Waveform to System Architecture and Applicatio ns</strong></span></div>\n<div class="x_elementToProof"><span style="font- family: arial\, helvetica\, sans-serif\; color: rgb(0\, 0\, 0)\; font-size : 12pt\;"><strong>Mohan Zhao - University of Virginia</strong></span></div >\n<div class="x_elementToProof"><span style="font-family: arial\, helveti ca\, sans-serif\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;">FMCW radar en ables simultaneous range and velocity measurement through a simple continu ous-wave architecture\, making it the dominant sensing modality in automot ive\, healthcare\, and industrial applications. This talk covers the essen tials: the linear chirp waveform and beat frequency derivation\, the RF tr ansceiver chain from PLL/VCO through mixer and ADC front-end\, the signal processing pipeline (range/Doppler FFT\, CFAR\, angle estimation)\, and a survey of application domains including 77 GHz automotive MIMO radar\, non -contact vital sign monitoring\, and emerging mmWave imaging systems. Hard ware design trade-offs &mdash\; phase noise\, chirp linearity\, mixer IIP3 &mdash\; and their impact on radar performance will be emphasized through out.</span></div>\n<div class="x_elementToProof">&nbsp\;</div>\n<div class ="x_elementToProof"><span style="font-family: arial\, helvetica\, sans-ser if\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;"><strong>Thin absorber AlIn AsSb 2-&mu\;m SACM APDs with photon-trapping gratings</strong></span></div >\n<div class="x_elementToProof"><span style="font-family: arial\, helveti ca\, sans-serif\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;"><strong>Hanna neh Karimi - University of Virginia</strong></span></div>\n<div class="x_e lementToProof"><span style="font-family: arial\, helvetica\, sans-serif\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;">In the extended short-wavelengt h infrared (eSWIR) spectral window\, high-sensitivity detectors are key co mponents for various low-light-level imaging and sensing applications\, in cluding eye-safe LIDAR. This talk presents low-room-temperature dark-curre nt AlxIn1-xAsySb1-y avalanche photodiodes (APDs) that operate at 2 &micro\ ;m by using a thin absorber. To compensate for the low external quantum ef ficiency (EQE) in thin absorbers\, we have fabricated 2D metal grating str uctures on SACM APDs with absorber layers ranging from 50 to 400 nm.<span style="mso-spacerun: yes\;">&nbsp\; </span>We have resolved the issue of n on-vertical side-wall angles in fabricated nanopillars by overcoating the sample with an index-matching liquid. Additionally\, the highest EQE was a chieved by optimizing the input polarization. The Noise Equivalent Power ( NEP) results of the designed structure are comparable to the HgCdTe at a t emperature of 200K.</span></div>\n<div class="x_elementToProof">&nbsp\;</d iv>\n<div class="x_elementToProof"><span style="font-family: arial\, helve tica\, sans-serif\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;"><strong><sp an style="line-height: 115%\; background: white\;"><span data-olk-copy-sou rce="MessageBody">Heterogeneous Integration of Photodiodes on Thin-Film Li thium Niobate Waveguides</span>&nbsp\;</span></strong></span></div>\n<div class="x_elementToProof"><span style="font-family: arial\, helvetica\, san s-serif\; color: rgb(0\, 0\, 0)\; font-size: 12pt\;"><strong><span style=" line-height: 115%\; background: white\;">Mohammadhassan Maghsoudian - Univ ersity of Virginia</span></strong></span></div>\n<div class="x_elementToPr oof"><span style="font-size: 12pt\; line-height: 115%\; font-family: arial \, helvetica\, sans-serif\; color: rgb(0\, 0\, 0)\; background: white\;">< span style="line-height: 115%\;">We present heterogeneously integrated pho todiodes on thin-film lithium niobate with low dark current and a responsi vity of 0.3 A/W for a 10 &times\; 20 &micro\;m&sup2\; active area\, making them ideal for high-bandwidth applications.</span></span></div> END:VEVENT END:VCALENDAR