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
494 2019-08-22 16:00  #1323, E6-2  Physics and Applications in Nanoelectronics and Nonomechanics file
493 2019-07-30 16:00  #1323, E6-2  Dirac fermions and flat bands in correlated kagome metals file
492 2019-06-04 17:00  #1323, E6-2  Stochastic nature of bacterial eradication using antibiotics file
491 2019-05-09 16:00  #1323, E6-2  Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
490 2019-05-09 16:00  #1323, E6-2  Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
489 2019-05-24 16:00  #1323, E6-2  Infrared spectroscopy study on metal-insulator transitions in layered perovskite iridates file
488 2019-05-30 16:00  #1323, E6-2  Tuning the excitonic properties of semiconductors with light-matter interactions file
487 2019-04-19 11:00  #1323, E6-2  First-principles studies of semiconductors for solar cell applications file
486 2019-04-23 16:00  #1323, E6-2  From Mott physics to high-temperature superconductivity file
485 2019-04-11 16:00  #1323, E6-2  Massive screening for cathode active materials using deep neural network file
484 2019-04-04 16:00  #1323, E6-2  Chiral spin-photon interaction at nanoscale file
483 2019-04-26 16:00  #1323, E6-2  Robust Quantum Metrology using Strongly Interacting Spin Ensembles and Quantum Convolutional Neural Network file
482 2019-06-17 10:30  #1323, E6-2  Chiral Spintronics file
481 2018-09-20 16:00  #1323, E6-2  Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
480 2018-09-20 16:00  #1323, E6-2  Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
479 2019-05-01 16:00  #1323, E6-2  Raman and x-ray scattering study on correlated electron systems: two case examples file
478 2019-05-31 11:00  #1323, E6-2  Cavity QED with Spin Qubits file
477 2019-05-08 16:00  E6 Room(#1323)  Imaging valley dependent electron transport in 2D semiconductors file
476 2018-07-09 14:00  #1323, E6-2  The principles of collective learning file
475 2019-12-13 13:30  #1323, E6-2  Biophysics Mini-symposium at KAIST file