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The Inventors have developed a compact Fourier Transform (FT) spectrometer for analyzing the intensity of electromagnetic radiation, ranging from UV to infrared, as a function of its spectral composition. This micro-device is suitable for smartphone-integrated FT spectrometers, and as such drastically lowers the threshold for using FT spectroscopy in daily life. Smartphone spectrometers can be used for such tasks as detecting blood sugar or blood oxygen levels and measuring UVA levels to determine cancer risks, among numerous other spectroscopic tasks across commercial, industrial and scientific domains.