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VERSION:2.0
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SUMMARY:Junior Quantum Seminar
DTSTART:20241029T093000
DTEND:20241029T110000
DTSTAMP:20260526T042839Z
UID:820e90e72b777b1155d0daeac8003feb894dc86622a2a914ce513474
CATEGORIES:Conferences - Seminars
DESCRIPTION:Shreyas S. Joglekar\, Chufan Zhou\nPlease join us for the Ju
 nior Quantum Seminar with Shreyas S. Joglekar from the Laboratory of N
 anoscale Magnetic Materials and Magnonics (EPFL)\, who will give the talk
  "Spin wave assisted magnetization switching of nanomagnet memory bits" 
 and Chufan Zhou from the Advanced Quantum Architecture Laboratory (EPFL) 
 who will give the talk "Planar 16-band metasurface-enhanced spectral filte
 r for integrated image sensing" on Tuesday October 29th from 9h30-11h.\n\n
 PLEASE NOTE: The Junior Quantum Series are for gathering  the junior qu
 antum community of master's students\, PhDs and post-docs at EPFL\, to cr
 eate a non-judgmental space were scientific ideas can be shared between pe
 ers. This event is not for Professors or senior researchers. \n\nABSTRACT
  :\n1. Spin wave assisted magnetization switching of nanomagnet memory bi
 ts:\nSpin waves or their quasi-particles known as magnons are promising ca
 ndidates to realize in-memory computing hardware. Propagating magnons cohe
 rently excited via microwave irradiation in a thin film Yttrium Iron Garne
 t (YIG) possess large decay lengths over hundreds of micrometers\, low-los
 s transmission\, complex interconnectivity and rich nonlinear phenomena. L
 everaging these properties along with the recently discovered memory funct
 ionality\, magnon-based computing platforms can offer an energy efficient 
 hardware platform for AI algorithms. In this talk\, I will focus on how ma
 gnons excited in YIG thin film can be stored in nonvolatile manner by swit
 ching the magnetization of differently shaped Ni81Fe19 nanomagnet memory b
 its having widths down to 50 nm. The talk will encompass various character
 ization techniques to readout the magnetic state of nanomagnet bits such a
 s Vector Network Analyzer\, Magnetic Force Microscopy\, Microfocus Brillou
 in Light Scattering spectroscopy and Scanning Transmission X-ray Microscop
 y.\n2. Planar 16-band metasurface-enhanced spectral filter for integrated
  image sensing:\nWe study theoretically and demonstrate experimentally a 1
 6-band narrow band wavelength selective filter in the near-infrared range.
  The combination of a pair of distributed Bragg reflectors with a sub-wave
 length grating metasurface embedded in the intra-cavity provides a narrow 
 response which can be tuned by adjusting the geometry of the sub-wavelengt
 h grating metasurface. The key advantage of this approach is its ease of f
 abrication\, where the spectral response is tuned by merely changing the g
 rating period\, resulting in a perfectly planar geometry that can be easil
 y integrated with a broad variety of photodetectors\, thus enabling attrac
 tive applications such as bio-imaging\, time-of-flight sensors and LiDAR. 
 The experimental results are supported by numerical simulations and effect
 ive medium theory that unveil the mechanisms that lead to the optical resp
 onse of the device. It is also shown how the polarization dependence of th
 e structure can be used to determine very accurately the polarization of i
 ncoming light.\n\nBIO:\n1. Shreyas S. Joglekar is a PhD student at EPFL 
 working on spin wave-based memory device. He obtained bachelor’s degree 
 in Metallurgical Engineering from College of Engineering Pune\, India and 
 received MSc in Materials Science and Engineering at EPFL. He worked on me
 tal additive manufacturing at Empa and on the growth of II-V and III-V sem
 iconductor nanostructures at the Laboratory of Semiconductor Materials (LM
 SC) before undertaking a doctoral research at LMGN.\n2. Chufan Zhou is a
  PhD student from AQUA lab. Her research interested in wavelength selectiv
 e filter and metasurface enhanced polarization imaging. She is frequent tr
 aveler and experienced baker.
LOCATION:GC A3 31 https://plan.epfl.ch/?room==GC%20A3%2031
STATUS:CONFIRMED
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