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538 results on '"Yang, Shuming"'

15. Thickness insensitive nanocavities for 2D heterostructures using photonic molecules

Author

Ji Peirui, Qian Chenjiang, Finley Jonathan J., and Yang Shuming

Subjects
2d heterostructure, mode coupling, nanocavity, photonic molecule, Physics, QC1-999
Abstract

Two-dimensional (2D) heterostructures integrated into nanophotonic cavities have emerged as a promising approach towards novel photonic and opto-electronic devices. However, the thickness of the 2D heterostructure has a strong influence on the resonance frequency of the nanocavity. For a single cavity, the resonance frequency shifts approximately linearly with the thickness. Here, we propose to use the inherent non-linearity of the mode coupling to render the cavity mode insensitive to the thickness of the 2D heterostructure. Based on the coupled mode theory, we reveal that this goal can be achieved using either a homoatomic molecule with a filtered coupling or heteroatomic molecules. We perform numerical simulations to further demonstrate the robustness of the eigenfrequency in the proposed photonic molecules. Our results render nanophotonic structures insensitive to the thickness of 2D materials, thus owing appealing potential in energy- or detuning-sensitive applications such as cavity quantum electrodynamics.

Published
2023
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32. Plasmonic interference modulation for broadband nanofocusing

Author

Li Shaobo, Yang Shuming, Wang Fei, Liu Qiang, Cheng Biyao, and Rosenwaks Yossi

Subjects
asymmetric slits, broadband nanofocusing, circumference interference, plasmonic modulation, polarization rotation, Physics, QC1-999
Abstract

Metallic plasmonic probes have been successfully applied in near-field imaging, nanolithography, and Raman enhanced spectroscopy because of their ability to squeeze light into nanoscale and provide significant electric field enhancement. Most of these probes rely on nanometric alignment of incident beam and resonant structures with limited spectral bandwidth. This paper proposes and experimentally demonstrates an asymmetric fiber tip for broadband interference nanofocusing within its full optical wavelengths (500–800 nm) at the nanotip with 10 nm apex. The asymmetric geometry consisting of two semicircular slits rotates plasmonic polarization and converts the linearly polarized plasmonic mode to the radially polarized plasmonic mode when the linearly polarized beam couples to the optical fiber. The three-dimensional plasmonic modulation induces circumference interference and nanofocus of surface plasmons, which is significantly different from the nanofocusing through plasmon propagation and plasmon evolution. The plasmonic interference modulation provides fundamental insights into the plasmon engineering and has important applications in plasmon nanophotonic technologies.

Published
2021
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40. Silicon nitride thermo-optic on-chip Mach–Zehnder interferometer at visible wavelengths.

Author

Wang, Xiaomin, Ji, Peirui, Li, Shaobo, Wang, Fei, Deng, Huiwen, and Yang, Shuming

Abstract

On-chip Mach–Zehnder interferometer (MZI) is a fundamental component for many integrated systems. It holds great promise in photonic applications at visible wavelengths. This paper presents an on-chip silicon nitride thermo-optic MZI. It is capable of generating interference at a wide wavelength range in the visible spectrum, including 488 nm, 532 nm, and 633 nm. The optical transmission loss is reduced by optimizing the device architecture. This work provides new insights into the designing of integrated optics and demonstrates the potential applications of on-chip MZI in the field of visual measurement. [ABSTRACT FROM AUTHOR]

Published
2024
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