visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-04-14 16:00 
일시 4pm, 14th April 
장소 E6 1323 
연사 신승우 (KAIST 물리학과) 
Title: Holographic tomography of dielectric tensors at optical frequency
 
Speaker: 신승우 (KAIST 물리학과)
 
Date: 4pm, 14th April
 
Place: E6 1323 (Available seats can be limited because of the COVID situation.)
 
Abstract
Ranging from material science to soft matter physics, liquid-crystal displays, and tissue biology, three-dimensional (3D) optically anisotropic structures have been investigated for versatile purposes in various research areas. However, conventional methods indirectly access information of 3D anisotropic structure, due to the lack of direct imaging modality for 3D anisotropy.
 
Optical diffraction tomography (ODT) techniques have been successfully demonstrated in reconstructing 3D refractive index (RI) distribution for various research areas. However, applications of the techniques have been restricted to optically isotropic objects, due to the scalar wave assumption in the ODT principles. This assumption severely limits broader applications of the ODT techniques to optically anisotropic objects, particularly for liquid crystalline materials and filament structures in biological cells.
 
Here, we present dielectric tensor tomography as a label-free modality for reconstructing 3D dielectric tensors of anisotropic structures. Dielectric tensor, a physical descriptor for vectorial light-matter interaction, serves intrinsic information of optical anisotropy including principal refractive indices and optic axes. By measuring diffracted electric fields and inversely solving a vectorial wave equation, the present method offers 3D distributions of dielectric tensors, principal RIs, and optic axes of anisotropic structures. The feasibility of the present method is validated by numerical simulations and experimental results. We demonstrate quantitative tomographic measurements of various nematic liquid-crystal structures and their fast 3D nonequilibrium dynamics.
번호 날짜 장소 제목
공지 2022-10-24 16:00  E6 #1501(공동강의실)  Physics Colloquim(Fall 2022)
공지 2022-09-21 10:30  E6-1 #1501  [Update 세미나 영상] Distinguished Lecture 'The Magic of Moiré Quantum Matter' Prof. Pablo Jarillo-Herrero(Department of Physics, MIT)
공지 2022-11-11 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Honeycomb oxide heterostructures for quantum spin liquid
공지 2022-10-28 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Machine-Learning-Guided Prediction models and Materials discovery for high Tc cuprates
공지 2022-10-07 11:00  E6-2 #1323  [Update 세미나 영상] (응집물리 세미나) Competing orders in a vanadium-based kagome metal monolayer
공지 2022-09-23 11:00  E6-2 #1323  [Update 세미나 영상] (응집물리 세미나) Steady Floquet-Andreev states in graphene Josephson junctions
공지 2022-09-22 11:00  E6-1 #1323  2022 가을학기 응집물리 및 광학 세미나 전체 일정
359 2020-12-11 14:30  online  Antisymmetric interlayer exchange coupling in magnetic multilayers
358 2020-11-20 14:30  Online  Lumpy Cooper pairs in an iron-based superconductor
357 2020-11-20 16:00  Online  Coherent control of field gradient induced quantum dot spin qubits
356 2016-09-05 16:00  Natual Scien Bldg.(E6)m #1501  Physics Colloquium : 2016 Fall file
355 2016-05-19 15:00  May 19, 2016 (Thur.) 3PM,  The CERN Resonant WISP Search: Development, Results and Lesson-Learned
354 2017-01-09 16:00  Lecture Hall, College of Natural Sciences [#1501,E6-2]  Topological Defects and Phase Transitions" file
353 2016-04-18 15:30  KI빌딩(E4), 강의실 B501 (5F)  First Principles Approaches for Intermolecular Interactions: From Gas-Phase Dimers to Liquid Water and Molecular Crystal Polymorphism file
352 2014-05-28 17:00  KI Building, Matrix Hall  부품소재산업이 미래다
351 2022-08-09 14:00  KI building (E4), Lecture Room Red (B501)  Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
350 2022-01-18 14:00  KI bldg. 5th fl. Room B501 & Zoom  Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo file
349 2016-08-04 14:30  KAIST Natural Science Building (E6-5), EDU 3.0 Room(1st fl.)  Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics)
348 2016-04-04 09:30  KAIST Natural Science Building (E6-2), RM #4314  Radio frequency engineering
347 2015-10-14 18:00  KAIST Munji Campus Supex Hall  인터스텔라 영화 속의 물리 file
346 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
345 2017-04-06 16:00  IBS CAPP seminar room, Creation Hall (3F), KAIST Munji Campus  For whom the Belle tolls
344 2020-10-16 16:00  https://kaist.zoom.us/j/89198078609  Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
343 2020-10-16 14:30  https://kaist.zoom.us/j/89198078609  Nanoscale magnetic resonance detection towards nano MRI file
342 2020-10-09 09:00  https://kaist.zoom.us/j/85161896513?pwd=U3pwWFFZaWVRamxDZUR5REhNeVk0UT09  Quantum Many-Body Simulation file
341 2020-10-15 17:00  https://bit.ly/3ndIiJn  Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file
340 2016-05-13 13:30  E6. #1501(1st fl.)  Aperiodic crystals in low dimensions