Optical simulation of device efficiency and contrast ratio for a digital micromirror device

John J. Piotrowski; Dmitry Vorobiev; Stephen A. Smee

doi:10.1117/12.2650595

15 March 2023 Optical simulation of device efficiency and contrast ratio for a digital micromirror device

John J. Piotrowski, Dmitry Vorobiev, Stephen A. Smee

Proceedings Volume 12435, Emerging Digital Micromirror Device Based Systems and Applications XV; 124350B (2023) https://doi.org/10.1117/12.2650595
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We present an electromagnetic simulation of a digital micromirror device (DMD) that models optical performance from the visible spectrum to the mid-wave infrared regime. We calculate DMD efficiency, including the effects of optical scatter and interference, over a wide range of focal ratios (f/2.8 to f/8) and wavelengths (0.4 μm to 5 μm). Furthermore, we investigate how contrast ratio varies with respect to wavelength, provided a set of operating parameters. The micromirror array structure of a DMD induces strong wavelength-dependent optical effects that impact the stray light and throughput of a system. To quantify this, we perform a three-dimensional electromagnetic finite-difference time-domain simulation where we illuminate the DMD with a focused, diffraction-limited beam; calculate the near-field electric field; and transform the distribution of light to the far-field. We characterize the performance of a DLP7000 device in three key wavelength regimes: the specular regime (λ < 1 μm), the transition regime (1 μm < λ < 3 μm), and the diffraction regime (3 μm < λ < 5 μm). Our results inform optical performance parameters and provide design constraints for the implementation of DMDs in sensitive optical instruments.

Conference Presentation

Citation Download Citation

John J. Piotrowski, Dmitry Vorobiev, and Stephen A. Smee "Optical simulation of device efficiency and contrast ratio for a digital micromirror device", Proc. SPIE 12435, Emerging Digital Micromirror Device Based Systems and Applications XV, 124350B (15 March 2023); https://doi.org/10.1117/12.2650595

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