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
» 2022-04-14 16:00  E6 1323  (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency
503 2022-11-11 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Honeycomb oxide heterostructures for quantum spin liquid file
502 2022-03-07 16:00  E6, #1501  Climate Physics and Modelling(우리말강의)
501 2022-08-01 10:00  E6 #1501 & Zoom  [Update 세미나 영상] James Webb Space Telescope & OTE Commissioning
500 2022-10-27 16:00  E6-2 #1323  (광학분야 세미나) Cavity optomechanical systems for quantum transduction
499 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
498 2016-05-17 11:00  창의학습관(E11), 406호  The CERN Resonant WISP Search: Development, Results and Lesson-Learned
497 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
496 2018-04-06 10:00  #2502, E6  Entanglement and thermalization in many-body systems: recent progress file
495 2015-09-15 16:00  E6, 1501  Physics Colloquium : 2014 Fall file
494 2022-03-14 16:00  E6, #1501  Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
493 2023-04-27 16:00  E6-2 #1323  (광학분야 세미나)On-chip spectrometers based on CMOS image sensors
492 2021-05-27 16:00  온라인  찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
491 2016-03-11 13:30  E6-2, 1501 외  Physics Seminar Serises : 2016 Spring file
490 2022-11-03 16:00  E6-2 #1323  (광학분야 세미나) Single-photon emission from low-dimensional materials
489 2015-09-07 16:00  E6, 1501  Physics Colloquium : 2015 Fall file
488 2022-04-11 16:00  E6, #1501  Emergence of Statistical Mechanics in Quantum Systems
487 2022-04-04- 16:00  E6, #1501  New paradigms in Quantum Field Theory
486 2022-05-09 16:00  E6, #1501  Searching for new electronic properties in correlated material flatland
485 2022-05-23 16:00  E6, #1501  Novel electronic transport in topological van der Waals magnets