arXiv 2402.070862024-02-11physics.optics

耦合相变与广义布鲁斯特效应以实现可调谐光学传感器设计

Coupling phase-switching with generalized Brewster effect for tunable optical sensor designs

Daniel T. Yimam, Dennis van der Veen, Teodor Zaharia, Maria Loi, Bart J. Kooi

AI总结：

本研究利用相变材料Sb2Se3与金基底构成多层异质结构，在单一布鲁斯特角实现s和p偏振光同时消失的广义布鲁斯特效应，并通过相变切换产生多个相位奇异点，用于高灵敏CO2气体传感。

摘要：

相变材料随其相变而变化的非线性且可调谐的光学常数已被应用于可重构光学器件中。例如，相变薄膜的一个可能应用是可调谐完美吸收设计，其中p偏振光在称为布鲁斯特角的特定入射角处反射率消失。本工作展示了一种基于强干涉效应的多层异质结构设计中的广义布鲁斯特效应（s偏振和p偏振光吸收）。所提出的设计包括涂覆在金基底上的低损耗相变材料Sb2Se3。我们在实验和理论上证明了在可见光和近红外波长范围内，在单一布鲁斯特角处s偏振和p偏振光的反射率同时消失。这种消失的反射率值（暗点）与具有突变相位奇异点相关。此外，我们展示了通过将活性Sb2Se3层在非晶态和晶态结构之间切换可以实现额外的相位奇异点，从而扩展了我们设计的功能。实现的相位奇异点对小的光学常数变化敏感，可用于超灵敏传感应用。作为概念验证，我们展示了我们设计的CO2气体传感能力，显示了光学响应与气体流速的线性依赖关系。我们相信，我们这种无光刻设计，具有来自共存的广义布鲁斯特效应和额外结构切换的多个相位奇异点，对于可调谐光学传感应用非常有前景。

英文摘要：

The non-linear and tunable optical constants of phase-change materials associated with their phase-switching have been utilized in reconfigurable optical devices. For example, one possible application of phase-change thin films is for tunable perfect absorption designs, where p- polarized light reflectance vanishes at a specific incidence angle known as the Brewster angle. This work demonstrates a generalized Brewster effect (s- and p- polarized light absorption) for a multilayered heterostructure design based on the strong interference effect. The proposed design comprises a low-loss phase-change material, Sb2Se3, coated on a gold substrate. We experimentally and theoretically show the coexistence of vanishing reflectance values for both s- and p- polarized lights in the visible and near IR wavelength range at a single Brewster angle. Such vanishing reflectance values (points of darkness) are associated with phase singularities with abrupt changes. Moreover, we show that additional phase singularities can be realized by switching the active Sb2Se3 layer between amorphous and crystalline structures, extending the functionality of our design. The realized phase singularities are susceptible to small optical constant changes and can be utilized for ultra-sensing applications. As a proof of concept, we demonstrate our design's CO2 gas sensing capabilities, showing a linearly dependent optical response with gas flow rate. We believe our lithography-free design with multiple phase singularities, from the coexisting generalized Brewster effect and from the additional structural switching, is highly promising for tunable optical sensing applications.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

AI总结：

摘要：

英文摘要：

相关论文