Active control of chirality in nonlinear metamaterials

An all-optical tunabe chirality is realized in a photonic metamaterial, the metamolecule of which consists of a nonlinear nano-Au:polycrystalline indium-tin oxide layer sandwiched between two L-shaped gold nano-antennas twisted 90° with each other. The maximum circular dichroism reached 30%. Under e...

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Bibliographic Details
Published in:Applied physics letters 2015-03, Vol.106 (9)
Main Authors: Zhu, Yu, Hu, Xiaoyong, Chai, Zhen, Yang, Hong, Gong, Qihuang
Format: Article
Language:English
Subjects:
Active control
ANTENNAS
Applied physics
CHIRALITY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DICHROISM
EXCITATION
GOLD
INDIUM COMPOUNDS
Indium tin oxides
LAYERS
METAMATERIALS
Nonlinear control
NONLINEAR PROBLEMS
Photonics
POLYCRYSTALS
Response time
SENSORS
TIN OXIDES
VISIBLE RADIATION
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Summary:An all-optical tunabe chirality is realized in a photonic metamaterial, the metamolecule of which consists of a nonlinear nano-Au:polycrystalline indium-tin oxide layer sandwiched between two L-shaped gold nano-antennas twisted 90° with each other. The maximum circular dichroism reached 30%. Under excitation of a 40 kW/cm2 weak pump light, the peak in the circular dichroism shifts 45 nm in the short-wavelength direction. An ultrafast response time of 35 ps is maintained. This work not only opens up the possibility for the realization of ultralow-power and ultrafast all-optical tunable chirality but also offers a way to construct ultrahigh-speed on-chip biochemical sensors.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4914343