visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2018-05-31 16:00 
연사  
장소 #1323, E6-2 

Physics Seminar Series

 

 

Dynamic control of optical properties with gated-graphene metamaterials

 

Prof. Teun-Teun Kim

 

Center for Integrated Nanostructure Physics (CINAP)

Institute for Basic Science (IBS)

Sungkyunkwan University (SKKU)

 

May 311 (Thu.), 04:00 PM

#1323, E6-2

 

Abstract:

In this talk, I will present recent my research results with different design of artificial media, called metamaterials which consist of the arrangement of periodic subwavelength optical elements that exhibit unusual optical properties beyond what natural materials can offer. I will show the gate-induced switching and linear modulation of terahertz waves can be achieved in a hybrid material system consisting of artificially constructed meta-atoms and an atomically thin graphene layer [1]. It has been experimentally demonstrated that by integrating graphene with metamaterials, significant transmission amplitude modulation of up to 50% with high modulation speed of about 80ns was achieved with gated graphene metamaterials. Based this approach, I will introduce electrically controllable unique optical properties such as optical activity [2], anomalous refraction, and focusing [3], and analogue of electromagnetically induced transparency (EIT) [4] by integrating 2D graphene layer onto metamaterials with different functional unit cells. The switching and linear modulation of unique optical properties are realized by changing coupling among meta-atoms or electrical conductivity of metallic structures caused by increased sheet conductivity of the single layer graphene. Benefitting from the electrically controllable unique optical properties, the proposed graphene based meta-devices are expected to provide a myriad of important applications such as active polarization controllers, active slow light devices, ultrasensitive sensors and nonlinear devices. 

Reference 

[1] S. H. Lee, et al, Nature Materials 11,936-641 (2012)

[2] T. -T. Kim, et al, Science Advances 3, e1701377 (2017)

[2] T. -T. Kim, et al, Advanced Optical Materials 6(1)1700507, (2018)

[3] T. -T. Kim, et al, ACS Photonics, 5(5), 1800-1807(2018).

 

 

Department of Physics, KAIST

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
566 2020-10-16 14:30    Nanoscale magnetic resonance detection towards nano MRI file
565 2015-12-02 16:00    Samarium Hexaboride: Is it a Topological insulator?
564 2020-10-16 16:00    Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
563 2015-11-19 16:00    Emergent Collective Phenomena and Functions at Reduced Dimensions
562 2016-05-16 16:00    Tuning microwave cavities with biased nonlinear dielectrics for axion searches
561 2018-10-12 14:30    Quantum Advantage in Learning Parity with Noise file
560 2023-04-04 16:00    Chiral Magnetism: A Geometric Perspective
559 2018-06-22 16:00    Tuning functional properties of BiFeO3 films using strain and growth chemistry file
558 2018-06-22 16:00    Tuning functional properties of BiFeO3 films using strain and growth chemistry file
557 2018-09-05 16:00    Shining a light on fractional excitations file
556 2022-03-18 11:00    (응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids file
555 2021-03-02 16:00    Sensitive terahertz detection with graphene-based transistors file
554 2020-11-20 16:00    Coherent control of field gradient induced quantum dot spin qubits
553 2016-11-04 15:00    Quantum information experiments using few electron spins in semiconductors
552 2022-01-17 14:00    Five Lectures on Observational Probes of Dark Energy file
551 2018-11-09 16:00    Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
550 2022-11-18 16:00    Qubits, new experimental tools for physics file
549 2020-11-20 14:30    Lumpy Cooper pairs in an iron-based superconductor
548 2017-07-10 16:00    “Intertwined Orders in a Heavy-fermion metal” file
547 2022-05-25 14:00    Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file