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  Discovered and maintained by CalDiscovery (https://caldiscovery.com). Eve
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X-WR-CALNAME:Boston · film · Monday · CalDiscovery
BEGIN:VEVENT
SUMMARY:MIT.nano Seminar: Acoustic Waves in Nanometer-Thick Films: Sub-Ter
 ahertz Devices and Coupling to Optical\, Electronic\, and Power Domains
DTSTART:20260921T190000Z
DTEND:20260921T200000Z
DTSTAMP:20260910T183139Z
UID:tag:localist.com\,2008:EventInstance_53940049198682
CATEGORIES:education,film
DESCRIPTION:Ruochen Lu\nAssistant Professor\, Chandra Family Department of
  Electrical and Computer Engineering\nThe University of Texas at Austin\n\
 nDate: September 21\, 2026\nTime: 3:00 – 4:00 PM ET\nLocation: 12-0168\n
 Reception to follow.\n\n \n\nABSTRACT\n\nAcoustic waves travel about five 
 orders of magnitude slower than electromagnetic waves\, so at the same fre
 quency an acoustic wavelength is roughly 100\,000 times shorter. That is w
 hy a modern smartphone holds more than eighty acoustic filters\, and why p
 iezoelectric devices are among the most volume-efficient signal processing
  components on chip. This talk asks how far that advantage can be scaled i
 n piezoelectric platforms.\n\n \n\nIn thin film piezoelectrics\, e.g.\, li
 thium niobate\, scaling toward millimeter-wave and sub-terahertz frequenci
 es runs into two constraints that pull against each other: thinner films l
 ose quality factor to surfaces and interfaces\, while higher-order overton
 es lose piezoelectric coupling to charge cancellation. The first part of t
 he talk covers periodically polarized piezoelectric films\, in which bonde
 d interfaces a few nanometers thick are placed at acoustic stress nodes so
  that the two constraints can be treated separately. On this platform we h
 ave measured resonators above 200 GHz and filters up to 50 GHz. Cryogenic 
 measurements separate temperature-dependent phonon–phonon dissipation fr
 om the temperature-independent interface loss that dominates at present\, 
 and show that these devices are still well short of the intrinsic limit.\n
 \n \n\nAdditionally\, thin suspended films also concentrate energy\, so mo
 dest drive powers are enough to produce strong nonlinearity\, including ph
 ononic frequency combs generated from a single input tone. The talk closes
  with ways the same platform couples acoustics to other domains: optomecha
 nical infrared sensing\, acoustoelectric interaction with electrons\, and 
 piezoelectric resonators that replace magnetics in power conversion. Taken
  together\, these devices cover nearly six decades of frequency\, from ult
 rasonic transducers below 100 kHz to resonators above 100 GHz\, on one int
 egrated acoustic microsystems.
LAST-MODIFIED:20260910T183139Z
LOCATION:Building 12\, 0168
URL:https://calendar.mit.edu/event/mitnano-seminar-acoustic-waves-in-nanom
 eter-thick-films-sub-terahertz-devices-and-coupling-to-optical-electronic-
 and-power-domains?utm_source=caldiscovery&utm_medium=ics&utm_campaign=bost
 on-ma
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