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1. Introduction Ultrafast spectroscopy [1,2] is a popular method to capture the spectra of dynamically evolving materials [3,4] at a rate that exceeds the refresh rate of conventional spectrometers [5,6], which is limited by CMOS/CCD camera refresh rates [7]. Ultrafast spectroscopy uses the multiple pump–multiple probe method to construct the dynamics of a spectrum [8]. A pump-probe pair is sent to material with a specified time delay between them.
Low-cost spectroscopy has received a great deal of attention in recent years in applications such as food inspection, disease detection, and manufacturing. Current spectroscopic systems rely on multiple optical components, making them mechanically fragile systems. In our previous work, we demonstrated the use of Fourier filtering using thin dielectric films. The sampling effect from the cavity resonances can be used to decompose a signal into its Fourier components.
Joshua A. Burrow, Riad Yahiaoui, Andrew Sarangan, Jay Mathews, Imad Agha, and Thomas A. Searles Author Affiliations Joshua A. Burrow,1,† Riad Yahiaoui,2,† Andrew Sarangan,1 Jay Mathews,3 Imad Agha,1,3 and Thomas A.
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