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Updated: Aug 6, 2026

Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
Published on: November 25, 2009
Direct observation of self-focusing with subdiffraction limited resolution using near-field scanning optical
1Department of Physics, Sogang University, 1 Sinsoo-Dong, Mapo-Ku, Seoul, 121-742, Korea.
Abstract:
The self-focusing effect in As2S3 glass has been studied using a near-field scanning optical microscope. Optical images of fine features in the self-focused beam were directly measured at the self-focus with approximately 100 nm spatial resolution. Because of the unusually large nonlinear refractive index at 690 nm, filaments with minimum size of 0.3 &mgr;m were observed in a 1.6 mW beam propagating through the 1.7 &mgr;m thin film. A qualitative analysis of our experimental results is presented. We show that nonparaxiality is responsible for arresting self-focusing, as predicted by recent theories.
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