Fabrication of holographic lens as a coupling device in surface plasmon resonance biosensor

Abstract

Holographic lens is proposed as a light coupling device integrated in surface plasmon resonance (SPR) biosensor chips to concise the SPR optical system. Having a sub-wavelength pattern with an asymmetric profile, the lens couples light via a first order wave which excites the surface plasmon wave along the sensing spot. The design and fabrication process are included in this work, where a laser interference lithography technique is utilized as it requires only single step to write a lens' pattern. The preliminary result indicates the first order wave with 20% diffraction efficiency. © 2010 Copyright SPIE - The International Society for Optical Engineering.