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DTSTAMP:20260427T152748Z
UID:E8CA8923-6068-48FD-9B91-959D0877C0CD
DTSTART;TZID=America/Denver:20260410T100000
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DESCRIPTION:This talk presents wave-based sensing and fast modeling methods
  spanning time-reversal acoustics\, nonlinear piezoelectric tuning\, and m
 agneto-acoustic device physics. I describe a time-reversal acoustics (TRA)
  measurement system for detecting change events in complex environments wh
 ere optical line-of-sight is blocked. The system detected both gross chang
 es (e.g.\, removing an object from a dense “forest” of posts) and subt
 le tampering (e.g.\, material substitution)\, with sub-wavelength spatial 
 sensitivity. Simulation tools revealed object and boundary interactions en
 coded in the time signals and quantified the impact of sensor geometry and
  boundary conditions on detection and localization. Second\, we developed 
 simulation capability to predict tuning in nonlinear RF devices\, demonstr
 ated voltage-controlled frequency tuning in X-cut lithium niobate (LN) on 
 insulator\, and created tools for nonlinear coupling analysis. A key outco
 me is capturing nonlinear effects with effective-medium properties\, enabl
 ing applications such as real-time RF device temperature stabilization. Th
 ird\, I motivate acoustically driven ferromagnetic resonance (ADFMR) for e
 nergy-efficient control of magnonic devices via magnetoelastic coupling dr
 iven by piezoelectric transducers. Lastly\, I describe fast simulation app
 roaches for magneto-acoustic devices using perturbation theory and a Stroh
 -formalism framework for efficient modeling of magnetoelastic layered medi
 a.\n\nSpeaker(s): Darren\, \n\nRoom: A204\, Bldg: Osborne Center\, 1420 Au
 stin Bluffs Pkwy\, Osborne Center\, Colorado Springs\, Colorado\, United S
 tates
LOCATION:Room: A204\, Bldg: Osborne Center\, 1420 Austin Bluffs Pkwy\, Osbo
 rne Center\, Colorado Springs\, Colorado\, United States
ORGANIZER:jbrock8@uccs.edu
SEQUENCE:9
SUMMARY:Dr. Darren W. Branch - Time-Reversal Change Detection and Rapid Mul
 tiphysics Models for Next-Generation Acoustic and Magnonic Devices
URL;VALUE=URI:https://events.vtools.ieee.org/m/549791
X-ALT-DESC:Description: <br /><p><span style="font-size: 11.0pt\; line-heig
 ht: 107%\; font-family: 'Calibri'\,sans-serif\; mso-ascii-theme-font: mino
 r-latin\; mso-fareast-font-family: Calibri\; mso-fareast-theme-font: minor
 -latin\; mso-hansi-theme-font: minor-latin\; mso-bidi-theme-font: minor-la
 tin\; mso-ansi-language: EN-US\; mso-fareast-language: EN-US\; mso-bidi-la
 nguage: AR-SA\;">This talk presents wave-based sensing and fast modeling m
 ethods spanning time-reversal acoustics\, nonlinear piezoelectric tuning\,
  and magneto-acoustic device physics. I describe a time-reversal acoustics
  (TRA) measurement system for detecting change events in complex environme
 nts where optical line-of-sight is blocked. The system detected both gross
  changes (e.g.\, removing an object from a dense &ldquo\;forest&rdquo\; of
  posts) and subtle tampering (e.g.\, material substitution)\, with sub-wav
 elength spatial sensitivity. Simulation tools revealed object and boundary
  interactions encoded in the time signals and quantified the impact of sen
 sor geometry and boundary conditions on detection and localization. Second
 \, we developed simulation capability to predict tuning in nonlinear RF de
 vices\, demonstrated voltage-controlled frequency tuning in X-cut lithium 
 niobate (LN) on insulator\, and created tools for nonlinear coupling analy
 sis. A key outcome is capturing nonlinear effects with effective-medium pr
 operties\, enabling applications such as real-time RF device temperature s
 tabilization. Third\, I motivate acoustically driven ferromagnetic resonan
 ce (ADFMR) for energy-efficient control of magnonic devices via magnetoela
 stic coupling driven by piezoelectric transducers. Lastly\, I describe fas
 t simulation approaches for magneto-acoustic devices using perturbation th
 eory and a Stroh-formalism framework for efficient modeling of magnetoelas
 tic layered media.</span></p>
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