Journal
OPTICS LETTERS
Volume 38, Issue 15, Pages 2702-2704Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.38.002702
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Funding
- RF Ministry of Education and Science under Federal program Research and Academic Cadres of Innovative Russia [8027]
- RF President's grants for Support of Leading Scientific Schools [NSh-4128.2012.9]
- Young Candidate of Science grant [MK-3912.2012.2]
- RFBR [12-07-00269, 12-07-31117, 13-07-97008]
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Using the finite-difference time-domain simulation, we show that if a gradient-index or binary planar dielectric microlens that focuses light at the output surface has a near-focus subwavelength slit the focal spot width is determined by the slit width. Notably, the slit allows the output light proportion to be increased due to the surface wave scattering, thus forming a focal spot nearly devoid of side lobes. In this work, the focal spot width of lambda/23 and the diffraction efficiency of focusing of 44% are achieved. (C) 2013 Optical Society of America
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