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Actively tunable optical filters based on chalcogenide phase-change materials(PCMs) are an emerging technology with applications across chemicalspectroscopy and thermal imaging. The refractive index of an embedded PCM thinfilm is modulated through an amorphous-to-crystalline phase transition inducedthrough thermal stimulus. Performance metrics include transmittance, passbandcenter wavelength (CWL), and bandwidth; ideally monitored during operation (insitu) 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 forperformance characterization, yet is expensive and inflexible -- incorporatingthe PCM tuning mechanism is not straightforward, hence in situ electro-opticalmeasurements are challenging. In this work, we implement an open-sourceMATLAB-controlled real-time performance characterization system consisting ofan inexpensive linear variable filter (LVF) and mid-wave infrared camera,capable of switching the PCM-based filters while simultaneously recording insitu filter performance metrics and spectral filtering profile. These metricsare calculated through pixel intensity measurements and displayed on acustom-developed graphical user interface in real-time. The CWL is determinedthrough spatial position of intensity maxima along the LVF's longitudinal axis.Furthermore, plans are detailed for a future experimental system that furtherreduces cost, is compact, and utilizes a near-infrared camera.

Automated real-time spectral characterization of phase-change tunable optical filters using a linear variable filter and infrared camera