Encoding arbitrary grey-level optical landscapes for trapping and manipulation using GPC

Carlo Amadeo Alonzo; Peter John Rodrigo; Darwin Palima; Jesper Glückstad

doi:10.1117/12.733956

5 September 2007 Encoding arbitrary grey-level optical landscapes for trapping and manipulation using GPC

Carlo Amadeo Alonzo, Peter John Rodrigo, Darwin Palima, Jesper Glückstad

Proceedings Volume 6644, Optical Trapping and Optical Micromanipulation IV; 66440X (2007) https://doi.org/10.1117/12.733956
Event: NanoScience + Engineering, 2007, San Diego, California, United States

Abstract

With the aid of phase-only spatial light modulators (SLM), generalized phase contrast (GPC) has been applied with great success to the projection of binary light patterns through arbitrary-NA microscope objectives for real-time threedimensional manipulation of microscopic particles. Here, we review the analysis of the GPC method with emphasis on efficiently producing speckle-free two-dimensional grey-level light patterns. Numerical simulations are applied to construct 8-bit grey-level optical potential landscapes with high fidelity and optical throughput via the GPC method. Three types of patterns were constructed: geometric block patterns, multi-level optical trap arrays, and optical obstacle arrays. Non-periodic patterns were accurately projected with an average of 80% diffraction efficiency. Periodic patterns yielded even higher diffraction efficiencies, averaging 94%, by the utilization of large-aperture phase contrast filters.

Citation Download Citation

Carlo Amadeo Alonzo, Peter John Rodrigo, Darwin Palima, and Jesper Glückstad "Encoding arbitrary grey-level optical landscapes for trapping and manipulation using GPC", Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66440X (5 September 2007); https://doi.org/10.1117/12.733956

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KEYWORDS

Diffraction

Optical arrays

Optical tweezers

Particles

Phase contrast

Spatial light modulators

Geometrical optics

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