FR4 Electromagnetic Scanner Based Fourier Transform Spectrometer

Abstract

Fourier transform spectrometers require an interferometric optical setup, where a precisely controlled motion of a mirror on a moving stage and a reference mirror are required. FR4, a common printed circuit board substrate, and the standard PCB technology is used to develop a simple gimbaled scanner structure with high precision to implement into a low-cost and viable Fourier Transform Spectrometer. On top of the corner cube reflector based tilt-insensitive setup, magnetic actuation optimization using twin opposing magnets solution is found to be helpful to enhance interference data. Large Lorentz force is generated for out-of-plane deflection while the torsional motion of the scanner is restricted. ±162.8um out-of-plane translation at 149 Hz resonance is realized with torsion effect deteriorated result which corresponds to <1nm spectral resolution at visible wavelengths.