Diffractive Optic Elements for Free Space Digital Optics Systems - Overview

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Goals

• design, fabricate, integrate precision diffractive and micro-optical components (lenslet arrays, analog and digital fan-out elements) with smart-pixel devices
• provide internal interconnections and input/output interface for parallel optoelectronic 2-D and 3-D communication, networking and computing modules
• 10>³ parallel channels in 1 cm² array; data rate of each channel > 100 Mb per second; module latency < 10 ns

Significant Accomplishments

• new designs (shift-variant arrays) and improved iterative design procedures reduce non-uniformity from 3.5% to 0.4% and increase efficiency from 86% to 92% for 8 phase level DOEs
• improved fabrication accuracy, efficiency, noise levels

Diffractive lenslets for spot array illumination

10 x 20 array

62.5 x 125 mm aperture

f/7 (1 mm focal length)

- 8 phase level

- 95% efficiency

f/3 (300 mm focal length)

- hybrid number of phase levels

- 83 % efficiency

Diffractive optical element for creating a 5 x 20 array of spots for reading out modulator arrays

DOE period	Spot Array for Reading Modulator States on Smart Pixel Array Chip
5 x 20 fanout DOE 5.1 mm feature size 408 x 102 micron sq. period 160 x 20 phase elements 8 phase levels

Measuring AR coating effects on DOE reconstruction

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