Efficient computation of computer-generated holograms for single-shot fabrication of micro-laboratory components

Authors

Mary Jacquiline Romero ⋅ PH National Institute of Physics, University of the Philippines Diliman
Darwin Palima ⋅ PH National Institute of Physics, University of the Philippines Diliman
Vincent Ricardo Daria ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

We identify an optimal method for single-shot fabrication micro-machines and micro-laboratory components using computer-generated holograms (CGH). The CGH is derived using the Gerchberg-Saxton (GS) algorithm, which finds the appropriate phase pattern that will be used as input to a spatial light modulator. Three-dimensional optical intensity distributions produced from the phase-only CGH can be used to fabricate microstructures in parallel. For customized intensity distributions, the standard GS algorithm converges to a phase input that yields a low quality intensity profile, which is inappropriate for light induced fabrication. Here, we identify a modified GS implementation to derive a phase input that corresponds to an intensity distribution suitable for microfabrication. The modified GS implementation is achieved by introducing amplitude tolerance at the Fourier plane and results in more effective output in terms of uniformity of the light distribution and optical throughput. The performance, in terms of uniformity of the intensity profile, for both standard and modified GS algorithm is evaluated via Linfoot's criteria. Using the modified algorithm we are able to recreate signals up to 96% fidelity with respect to the desired patterns.

Downloads

Issue

2005: Proceedings of the 23rd Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2005-1D-01

Section

Image and Signal Processing

Published

2005-10-26

How to Cite

[1]

MJ Romero, D Palima, and VR Daria, Efficient computation of computer-generated holograms for single-shot fabrication of micro-laboratory components, Proceedings of the Samahang Pisika ng Pilipinas 23, SPP-2005-1D-01 (2005). URL: https://proceedings.spp-online.org/article/view/SPP-2005-1D-01.