Narrow-bandgap titanium sesquioxide with resonant metasurfaces for enhanced infrared absorption

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-12-23 DOI:10.1063/5.0240125

Viktoriia E. Babicheva, Evgeniya Lock, Heungsoo Kim

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引用次数: 0

Abstract

We report on the structural, chemical, and optical properties of titanium sesquioxide Ti2O3 thin films on single-crystal sapphire substrates by pulsed laser deposition. The thin film of Ti2O3 on sapphire exhibits light absorption of around 25%–45% in the wavelength range of 2–10 μm. Here, we design an infrared photodetector structure based on Ti2O3, enhanced by a resonant metasurface, to improve its light absorption in mid-wave and long-wave infrared windows. We show that light absorption in the mid-wave infrared window (wavelength 3–5 μm) in the active Ti2O3 layer can be significantly enhanced from 30%–40% to more than 80% utilizing a thin resonant metasurface made of low-loss silicon, facilitating efficient scattering in the active layer. Furthermore, we compare the absorptance of the Ti2O3 layer with that of conventional semiconductors, such as InSb, InAs, and HgCdTe, operating in the infrared range with a wavelength of 2–10 μm and demonstrate that the absorption in the Ti2O3 film is significantly higher than in these conventional semiconductors due to the narrow-bandgap characteristics of Ti2O3. The proposed designs can be used to tailor the wavelengths of photodetection across the near- and mid-infrared ranges.

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具有共振超表面增强红外吸收的窄带隙倍半氧化钛

本文报道了脉冲激光沉积法在单晶蓝宝石衬底上制备倍半氧化钛Ti2O3薄膜的结构、化学和光学性质。蓝宝石表面Ti2O3薄膜在2 ~ 10 μm波长范围内的光吸收率约为25% ~ 45%。在此，我们设计了一种基于Ti2O3的红外光电探测器结构，通过共振超表面增强，以提高其在中波和长波红外窗口的光吸收。我们发现，利用低损耗硅制成的薄共振超表面，可以将活性Ti2O3层中波红外窗口（波长3-5 μm）的光吸收率从30%-40%显著提高到80%以上，促进了活性层的有效散射。此外，我们比较了Ti2O3薄膜与传统半导体（如InSb、InAs和HgCdTe）在2-10 μm波段的红外吸收，发现由于Ti2O3的窄带隙特性，Ti2O3薄膜的吸收明显高于这些传统半导体。所提出的设计可用于在近红外和中红外范围内调整光探测的波长。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.