Journal
OPTICS EXPRESS
Volume 18, Issue 5, Pages 4518-4525Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.004518
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Funding
- Japan Society of Promotion and Science
- Kyoto University
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
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We demonstrate the formation of a sub-wavelength focal spot with a long depth of focus using a radially polarized, narrow-width annular beam. Theoretical analysis predicts that a tighter focal spot ( approximately 0.4 lambda) and longer depth of focus (more than 4 lambda) can be formed by a longitudinal electric field when the width of the annular part of the beam is decreased. Experimental measurements using a radially polarized beam from a photonic crystal laser agree well with these predictions. Tight focal spots with long depths of focus have great potential for use in high-tolerance, high-resolution applications in optical systems. (C) 2010 Optical Society of America
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