Polarization-Dependent Nonlinear Optical Responses of CrPS4 for Ultrafast All-Optical Switches

IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Lei Yan, Ziyao Gong, Qinyong He, Dechao Shen, Anping Ge, Yang Liu, Guohong Ma, Ye Dai, Liaoxin Sun, Saifeng Zhang
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Abstract

Due to the extraordinary chemical and physical properties, ternary chalcogenides with wide-range bandgap, unique structures, and exceptional photoelectric properties have attracted great interest recently. Among them, Chromium thiophosphate (CrPS4) is a promising semiconductor with excellent optical, mechanical, and electronic properties and has a lower lattice symmetry resulting in significant in-plane anisotropy. Here, the polarization-dependent nonlinear optical (NLO) responses of CrPS4 flake are investigated. Based on polarization-resolved Raman spectroscopy, which identifies the crystal axis of sample, the anisotropic linear absorption spectra, I-scan technique, and pump-probe measurements are utilized to investigate the optical absorption information of CrPS4. The polarization-dependent NLO responses are found originating from the anisotropic optical transition probability. And the polar optical phonons play an important role in carrier relaxation processes. Furthermore, CrPS4-based all-optical switches are proposed, which can modulate the transmittance of signal light (CW laser) by changing the polarization of switch light (fs laser). This work provides insights into polarization-dependent CrPS4-based devices, which is important to promote the potential applications in optical modulator, versatile optoelectronic detection, and so on.

Abstract Image

用于超快全光开关的CrPS4偏振相关非线性光响应
三元硫族化合物由于其特殊的化学和物理性质,具有宽带隙、独特的结构和特殊的光电性质,近年来引起了人们的极大兴趣。其中,硫代磷酸铬(CrPS4)是一种很有前途的半导体,具有优异的光学、机械和电子性能,并且具有较低的晶格对称性,导致显着的面内各向异性。本文研究了CrPS4薄片的偏振相关非线性光学(NLO)响应。基于偏振分辨拉曼光谱识别样品的晶体轴,利用各向异性线性吸收光谱、i扫描技术和泵浦探针测量研究了CrPS4的光吸收信息。偏振相关的NLO响应来源于各向异性的光跃迁概率。极性光学声子在载流子弛豫过程中起着重要的作用。在此基础上,提出了基于crps4的全光开关,通过改变开关光(fs激光)的偏振来调制信号光(CW激光)的透射率。这项工作为基于偏振相关的crps4器件提供了新的见解,这对于促进其在光调制器、多功能光电检测等领域的潜在应用具有重要意义。
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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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