Superpixel-based spatial amplitude and phase modulation using a digital micromirror device

Abstract

We present a superpixel method for full spatial phase and amplitude control of a light beam using a digital micromirror device (DMD) combined with a spatial filter. We combine square regions of nearby micromirrors into superpixels by low pass filtering in a Fourier plane of the DMD. At each superpixel we are able to independently modulate the phase and the amplitude of light, while retaining a high resolution and the very high speed of a DMD. The method achieves a measured fidelity $F=0.98$ for a target field with fully independent phase and amplitude at a resolution of $8\times 8$ pixels per diffraction limited spot. For the LG${}_{10}$ orbital angular momentum mode the calculated fidelity is $F=0.99993$, using $768\times 768$ DMD pixels. The superpixel method reduces the errors when compared to the state of the art Lee holography method for these test fields by $50\%$ and $18\%$, with a comparable light efficiency of around $5\%$. Our control software is publicly available.

9 pages, 6 figures

References in corpus (5)

• Control of light transmission through opaque scattering media in space and time
• Focusing Light through Random Photonic Media by Binary Amplitude Modulation
• Spatial amplitude and phase modulation using commercial twisted nematic LCDs
• Trapping and observing single atoms in the dark
• Shaping Laguerre-Gaussian laser modes with binary gratings using a Digital Micromirror Device

Cited by in corpus (2)

• Light fields in complex media: mesoscopic scattering meets wave control
• Kilohertz binary phase modulator for pulsed laser sources using a digital micromirror device