Highly sensitive temperature sensor using one-dimensional Bragg Reflector for biomedical applications.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-06-27 DOI:10.1515/bmt-2022-0482

Ranjith B Gowda, Preeta Sharan, Saara K

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引用次数: 1

Abstract

A theoretical investigation of multi-layer Bragg Reflector (BR) structure to design highly sensitive temperature sensor is proposed to measure the temperature over a wide range. Characteristic-Matrix (CM) mathematical tool is used to design and analyse the proposed temperature sensor. A 1D Distributed Bragg Reflector multi-layer structure is used to design and analyse the sensing characteristics of the proposed sensor. Periodic modulation in the Refractive-Index (RI) of the two materials, high and low, forms DBR multi-layer structure. Germanium and air are used as the two alternate materials of BR for high and low dielectric layers respectively. Parameters of many semiconductor materials, including germanium, varies with temperature. Here we have considered RI variation of germanium with the temperature to model and design the proposed sensor. A defect layer is introduced at the center of multi-layer structure to obtain the resonating mode for an incident electromagnetic wave. The sensor can detect temperature over a wide range from 100 to 550 K. A resonating mode, shifting towards different wavelength region is observed for the temperature variations. The influence of increase in the DBR layers (N) and defect cavity geometrical length (l_D) is studied. The obtained results conclude that the cavity defect length and BR layers affects the sensing parameters of the designed sensor. The obtained RI sensitivity, Q-factor, temperature sensitivity and detection limit of the sensor are 2.323 μm/RIU, 115,000, 1.18 nm/K and 9.024 × 10^-6 RIU respectively. Theoretically obtained transmission spectrum was validated using Monte Carlo simulation.

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用于生物医学应用的高灵敏度温度传感器，采用一维布拉格反射器。

提出了一种利用多层布拉格反射器结构设计高灵敏度温度传感器的理论研究方法，以实现大范围温度测量。利用特征矩阵(CM)数学工具对所提出的温度传感器进行了设计和分析。采用一维分布布拉格反射器多层结构设计并分析了该传感器的传感特性。高、低两种材料的折射率(RI)周期调制形成DBR多层结构。采用锗和空气作为BR的两种替代材料，分别用于高介电层和低介电层。包括锗在内的许多半导体材料的参数随温度而变化。在这里，我们考虑了锗的RI随温度的变化来建模和设计所提出的传感器。在多层结构的中心引入缺陷层，以获得入射电磁波的谐振模式。该传感器可以在100至550 K的宽范围内检测温度。在温度变化中观察到一种向不同波长区域偏移的共振模式。研究了DBR层数(N)的增加和缺陷腔几何长度(lD)的影响。结果表明，空腔缺陷长度和BR层对所设计传感器的传感参数有影响。测得该传感器的RI灵敏度为2.323 μm/RIU, q因子为11.5万，温度灵敏度为1.18 nm/K，检出限为9.024 × 10-6 RIU。通过蒙特卡罗仿真验证了理论所得的透射谱。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.