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
422 2015-03-04 12:00  1323호, E6-2  Bioimaging and Biosensing Using Near-Infrared Fluorescence file
421 2016-12-12 13:30  1:30p.m. #1323(E6-2. 1st fl.)  “Possible symmetry in the phase diagrams of electron- & hole-doped cuprate high-Tc superconductors”
420 2016-10-18 13:30  1st fl. #1323(E6-2)  "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
419 2019-07-10 16:00  Academic Cltural Complex (E9) 5층 스카이라운지  Public Lectures file
418 2015-08-04 11:00  B501, Room Red, KI bldg. 5nd fl.  Propagation of ultrasound through two- and three-dimensional strongly scattering media
417 2016-06-01 10:30  BK21 Conference Room (#1318, E6-2)  Welcome to Nature Photonics
416 2020-10-15 16:00  CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus  Graphene-based Josephson junction microwave bolometer file
415 2023-09-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
414 2023-05-15 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  Role of dark Higgs boson in DM physics and cosmology file
413 2023-09-18 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP Seminar] Searching for axions in quantum vacuum birefringence file
412 2023-10-11 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Particle Physics with Neutrinos file
411 2023-09-21 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Axion Magnetic Resonance file
410 2024-01-25 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminars] Detecting Gravitational Waves by Elecromagnetic Cavity
409 2023-06-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] EMC at CERN file
408 2023-03-27 15:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  A coherent mechanical oscillator pumped by a suspended quantum dot file
407 2023-03-30 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  Detecting axions with chiral magnetic effects file
406 2023-07-26 10:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio
405 2023-06-22 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP Seminar] The muon g-2 puzzle file
404 2023-06-15 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP Seminar] Cryogenic electronics for ion traps file
403 2023-12-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  Superconducting qubits for large-scale quantum computers file