使用线性可变滤波器和红外照相机的相变可调谐光学滤波器的自动实时光谱表征
Automated real-time spectral characterization of phase-change tunable optical filters using a linear variable filter and infrared camera
摘要：
基于硫系相变材料（PCM）的有源可调谐光学滤波器是一种新兴技术，其应用范围涵盖化学光谱和热成像。嵌入式PCM薄膜的折射率通过由热刺激诱导的非晶到结晶相变来调制。性能指标包括透射率、通带中心波长（CWL）和带宽;理想情况下，在运行期间（原位）或经过一定数量的调谐周期后进行监测，以验证实时运行。实时测量上述指标具有挑战性。傅里叶变换红外光谱（FTIR）为性能表征提供了黄金标准，但价格昂贵且不灵活-结合PCM调谐机制并不简单，因此原位电光测量具有挑战性。在这项工作中，我们实现了一个开源的MATLAB控制的实时性能表征系统，包括一个廉价的线性可变滤波器（LVF）和中波红外相机，能够切换PCM为基础的过滤器，同时记录在原位过滤器的性能指标和光谱过滤配置文件。这些指标通过像素强度测量计算，并实时显示在定制开发的图形用户界面上。CWL通过沿LVF的纵轴的强度最大值的空间位置来确定。此外，详细计划未来的实验系统，进一步降低成本，是紧凑的，并利用近红外相机。
英文摘要：
Actively tunable optical filters based on chalcogenide phase-change materials (PCMs) are an emerging technology with applications across chemical spectroscopy and thermal imaging. The refractive index of an embedded PCM thin film is modulated through an amorphous-to-crystalline phase transition induced through thermal stimulus. Performance metrics include transmittance, passband center wavelength (CWL), and bandwidth; ideally monitored during operation (in situ) or after a set number of tuning cycles to validate real-time operation. Measuring these aforementioned metrics in real-time is challenging. Fourier-transform infrared spectroscopy (FTIR) provides the gold-standard for performance characterization, yet is expensive and inflexible -- incorporating the PCM tuning mechanism is not straightforward, hence in situ electro-optical measurements are challenging. In this work, we implement an open-source MATLAB-controlled real-time performance characterization system consisting of an inexpensive linear variable filter (LVF) and mid-wave infrared camera, capable of switching the PCM-based filters while simultaneously recording in situ filter performance metrics and spectral filtering profile. These metrics are calculated through pixel intensity measurements and displayed on a custom-developed graphical user interface in real-time. The CWL is determined through spatial position of intensity maxima along the LVF's longitudinal axis. Furthermore, plans are detailed for a future experimental system that further reduces cost, is compact, and utilizes a near-infrared camera.
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