Fabrication of photonic crystal templates using holographic optical tweezers and adhesion via entropic attraction

David C. Benito; David M. Carberry; Julia Hildmann; Eleanor G. Edwards; Stephen H. Simpson; Graham M. Gibson; Miles J. Padgett; John G. Rarity; Martin Kuball; Mervyn J. Miles; Simon Hanna

doi:10.1117/12.795070

29 August 2008 Fabrication of photonic crystal templates using holographic optical tweezers and adhesion via entropic attraction

David C. Benito, David M. Carberry, Julia Hildmann, Eleanor G. Edwards, Stephen H. Simpson, Graham M. Gibson, Miles J. Padgett, John G. Rarity, Martin Kuball, Mervyn J. Miles, Simon Hanna

Author Affiliations +

Proceedings Volume 7038, Optical Trapping and Optical Micromanipulation V; 70380K (2008) https://doi.org/10.1117/12.795070
Event: NanoScience + Engineering, 2008, San Diego, California, United States

Abstract

In suspensions containing microspheres and a sub-micron species, such as nanoparticles or a polymer, an attractive force can result between the microspheres. This attraction arises due to an entropic interaction, often referred to as a depletion force. In this work we demonstrate an application of the depletion force to the controlled assembly of crystalline templates for the production of photonic band gap (PBG) materials. The method makes use of holographic optical tweezers to assemble crystalline arrays of silica or polystyrene microspheres, in which depletion interactions are used to stabilise the structures being built. In addition, we use the holographic optical tweezers to characterise the attraction between pairs of microspheres in the system.

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David C. Benito, David M. Carberry, Julia Hildmann, Eleanor G. Edwards, Stephen H. Simpson, Graham M. Gibson, Miles J. Padgett, John G. Rarity, Martin Kuball, Mervyn J. Miles, and Simon Hanna "Fabrication of photonic crystal templates using holographic optical tweezers and adhesion via entropic attraction", Proc. SPIE 7038, Optical Trapping and Optical Micromanipulation V, 70380K (29 August 2008); https://doi.org/10.1117/12.795070

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