Imperial College London

DrSang SoonOh

Faculty of Natural SciencesDepartment of Physics

Visiting Researcher



s.oh Website




901Blackett LaboratorySouth Kensington Campus






BibTex format

author = {Kim, T-T and Oh, SS and Kim, H-D and Park, HS and Hess, O and Min, B and Zhang, S},
doi = {10.1126/sciadv.1701377},
journal = {Science Advances},
title = {Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials.},
url = {},
volume = {3},
year = {2017}

RIS format (EndNote, RefMan)

AB - Active control of polarization states of electromagnetic waves is highly desirable because of its diverse applications in information processing, telecommunications, and spectroscopy. However, despite the recent advances using artificial materials, most active polarization control schemes require optical stimuli necessitating complex optical setups. We experimentally demonstrate an alternative-direct electrical tuning of the polarization state of terahertz waves. Combining a chiral metamaterial with a gated single-layer sheet of graphene, we show that transmission of a terahertz wave with one circular polarization can be electrically controlled without affecting that of the other circular polarization, leading to large-intensity modulation depths (>99%) with a low gate voltage. This effective control of polarization is made possible by the full accessibility of three coupling regimes, that is, underdamped, critically damped, and overdamped regimes by electrical control of the graphene properties.
AU - Kim,T-T
AU - Oh,SS
AU - Kim,H-D
AU - Park,HS
AU - Hess,O
AU - Min,B
AU - Zhang,S
DO - 10.1126/sciadv.1701377
PY - 2017///
SN - 2375-2548
TI - Electrical access to critical coupling of circularly polarized waves in graphene chiral metamaterials.
T2 - Science Advances
UR -
UR -
VL - 3
ER -