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Optical Engineering

Phase and amplitude apodization induced by focusing through an evanescent gap in a solid immersion lens microscope
Author(s): Joshua Sseunhyeun Jo; Tomas D. Milster; James Kevin Erwin
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Paper Abstract

we characterize phase and amplitude apodization induced when a converging beam passes through an evanescent gap. The apodization is caused by vector transmission and reflection properties. General characteristics are described for solid immersion lens indices from nSIL= 1.5 to 3.1, gap heights from h = 0 to 300 nm, and marginal ray angles ?m = 0.7 or 0.84, where ?m is the direction cosine of the marginal ray angle inside the solid immersion lens. A small amount of defocus is found to be a good compensator of the phase apodization for low nSiL and h. After proper defocus is applied, asymmetry of focus in the spot may remain, primarily due to the uncompensated amplitude apodization. Simplification of the phase and amplitude characteristics is accomplished by applying a Jones-matrix expansion to the transmission coefficient through the gap. Simulation and experiment quantify the effect with a simple solid immersion lens geometry.

Paper Details

Date Published: 1 August 2002
PDF: 10 pages
Opt. Eng. 41(8) doi: 10.1117/1.1485999
Published in: Optical Engineering Volume 41, Issue 8
Show Author Affiliations
Joshua Sseunhyeun Jo, Univ. of Arizona (United States)
Tomas D. Milster, Univ. of Arizona (United States)
James Kevin Erwin, Univ. of Arizona (United States)

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