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Indexed by:期刊论文

Date of Publication:2015-08-06

Journal:RSC ADVANCES

Included Journals:SCIE、EI、Scopus

Volume:5

Issue:85

Page Number:69319-69324

ISSN No.:2046-2069

Abstract:Light-steering devices have been extensively investigated for a large host of applications in defense, communications, data storage and display technologies. However, the challenge is to continuously steer the light over a wide angular range in the optical region, using actively tunable structure with a small footprint. Here, we numerically demonstrate a gradient phase-array-like Au/Bi2Se3/Au trilayers plasmonic resonators for actively steering the beam in the near-infrared (N-IR) region. The proposed device provides a continuously large beam-steering of 18 degrees for the reflected light and 9 degrees for the transmitted light around the resonant wavelength of 1500 nm by changing the state of Bi2Se3 from amorphous to crystalline. The essence of this phenomenon lies in the variation of refractive index of Bi2Se3 induced by the phase transition, which is achieved through the chemical reactions between the Bi2Se3 film and AgNO3 solution. The continuous beam-steering is enabled by gradually increasing the immersion time (t(im)) of the Bi2Se3 into AgNO3 solution. This study exploits a new research area of Bi2Se3 based nano-antenna for dynamic optical routing and switching in photonic circuits.