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27 results on '"Guo, Chucai"'

1. Large Chiroptical Effects in Planar Chiral Metamaterials

Author

Ye, Weimin, Yuan, Xiaodong, Guo, Chucai, Zhang, Jianfa, Yang, Biao, and Zhang, Shuang

Subjects
Physics - Optics
Abstract

Chiroptical effects, characterized by different optical responses for left- (LCP) and right- handed circularly polarized light (RCP), are powerful and valuable tools in optics with wide applications in polarization resolved imaging and sensing. Previously observed strong chiroptical effects are limited to metamaterials with complex three-dimensional chiral structures at the sub-wavelength scale. Although asymmetrical transmission of LCP and RCP have been investigated in planar chiral metasurfaces, the observed weak chiroptical effects result from anisotropic Ohmic dissipation of the metal constituents. Here, we demonstrate by theory and proof-of-concept experiments that large difference in transmittances of LCP and RCP can be attained in a single-layer planar chiral metamaterial with a sub-wavelength thickness. Without violating the reciprocity and mirror symmetry, the strong chiroptical effect, independent of dielectric loss, arise from a novel mechanism of multimode interference. The described effect may lead to new gateway towards chiral manipulations of light and chiral optical devices.

Published
2018

3. Circular Polarizer Realized by a Single Layer of Planar Chiral Metallic Nanostructure

Author

Ye, Weimin, Yuan, Xiaodong, Guo, Chucai, Zhang, Jianfa, Yang, Biao, Liu, Ken, Zhu, Zhihong, and Zeng, Chun

Subjects
Physics - Optics
Abstract

As a basic optical element, circular polarizer plays significant roles in signal transmission, measurements and life science microscopy. Three-dimensional (3D) chiral structures have been thought to be necessary to realize circular polarizers. Here we demonstrate theoretically and experimentally for the first time that a high-efficiency circular polarizer could be realized by a single layer of planar 2D chiral structure. Our proposed circular polarizer is based on unidirectional polarization conversion instead of circular polarization stop bands. Since two-dimensional planar structures present obvious advantage for fabrication and integration on chip, the proposed circular polarizer is of great interest in integrated optics and microscopy. It provides a novel scheme to manipulate polarizations of light wave, as well as Terahertz wave and microwave., Comment: 13 pages, 10 figures including Supplementary Materials

Published
2014

27. High-Performance Photodetectors Based on MoTe 2 -MoS 2 van der Waals Heterostructures.

Author

Ji X, Bai Z, Luo F, Zhu M, Guo C, Zhu Z, and Qin S

Abstract

Two-dimensional (2D) materials have got extensive attention for multifunctional device applications in advanced nanoelectronics and optoelectronics, such as field-effect transistors, photodiodes, and solar cells. In our work, we fabricated MoTe 2 -MoS 2 van der Waals heterostructure photodetectors with great performance using the mechanical exfoliation method and restack technique. It is demonstrated that our MoTe 2 -MoS 2 heterostructure photodetector device can operate without bias voltage, possessing a low dark current (10 pA) and high photocurrent on/off ratio (>10 4 ). Importantly, the room temperature photoresponsivity of the MoTe 2 -MoS 2 photodetector can reach 110.6 and 9.2 mA W -1 under λ = 532 and 1064 nm incident laser powers, respectively. Our results indicate that the van der Waals heterostructure based on 2D semiconducting materials is expected to play an important role in nanoscale optoelectronic applications., Competing Interests: The authors declare no competing financial interest., (© 2022 The Authors. Published by American Chemical Society.)

Published
2022
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