16-Channel Snapshot Multispectral Imaging Based on Integrated Fabry Perot Microcavity Array

Abstract

By designing and fabricating a narrow-band Fabry-Perot multi-beam interference spectroscopic microcavity arrays, and integrating it with a visible light detector focal plane array, we demonstrate a small compact multispectral imaging detector.<br/>The micro-cavity filter array with 4×4 basic repeating unit and a total of 2048×2048 pixels was obtained on the quartz substrate by the four-fractal combination lithograph-etching process. Then the microminiature multispectral imaging detector is formed by fitting with the detector chip. Among them, the depth and precision of the etching will determine the distribution and offset of the central wavelength of the narrowband spectral channel respectively. The results show that the etching rate of reactive ion is 3.6 ± 0.2 Å/s, and the process is stable and controllable. Due to the different etching depth, the basic repeating unit formed 16 different levels of steps, and the process achieved the design expectation well.<br/>The results show that the response spectrum peak of the microcavity array sample varies from 520 nm to 680 nm, the free spectrum range is 160 nm, the full width at the half-peak is less than 10 nm, the transmittance is about 70%, the relative half-width of the transmittance peak at 590 nm is 1.19%, and the waveform coefficient is 2.78.<br/>A 16-channel multispectral camera is constructed by using the optical micro-precision assembly device to realize the precise alignment and fitting of the micro-cavity filter array and the image sensor.<br/>Xenon lamp and monochromator are used as tunable wavelength monochromatic cooperative light source to detect the effect of 16-channel snapshot multispectral imaging at pixel scale. The results show that the multispectral imaging detector has 16 different narrow-band response spectra. The characteristic spectrum of the target can be clearly distinguished by spectral channel.<br/>When imaging the target with known spectral characteristics, for a certain frame of multi-spectral image, selecting a suitable spectral channel can eliminate the background in the field of view through image subtraction and improve the contrast of the target. In the dark room condition, we take the LED light source with the center wavelength of 528 nm and 589 nm as the target (the wavelength coincides with the working wavelength of the spectral channel), and effectively suppress the background through the spectral differential intensity subtraction, which can improve the accuracy and sensitivity of the target capture.<br/>The 16-channel snapshot multi-spectral imaging detector based on integrated Fabry-Perot microcavity array has the advantages of small size, high integration and strong environmental adaptability, and is expected to play a role in the field of real-time detection of weak moving targets, auxiliary diagnosis of skin surface observation, and high dynamic range imaging of target observation under backlight conditions.