Research Papers

Generation of near-field light at a nanoslit with rounded edges

[+] Author Affiliations
Tomohiro Sato

Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, G2-23, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan

Haruhiko Ito

Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, G2-23, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan

J. Nanophoton. 5(1), 053501 (March 11, 2011). doi:10.1117/1.3543818
History: Received October 18, 2010; Revised November 30, 2010; Accepted December 10, 2010; Published March 11, 2011; Online March 11, 2011
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We numerically analyze the generation of near-field light at a 50-nm-wide slit used for two-step photoionization detection of alkali-metal atoms with high spatial resolution, considering the influence of rounding the slit edges. In the case where near-field light is generated via total-internal reflection of s-polarized light introduced along the slit, the intensity decreases with increasing the radius of curvature of the slit edge. Finite-difference time-domain simulations indicate that the electric field is concentrated in the upper left and right corners of the slit when the radius of curvature is small, but the enhancement is resolved due to edging down. Assuming that the intensity of an Ar+ laser beam with a wavelength of 476.5 nm is 5 × 104 W/cm2, the radius of curvature of the edge of less than 15 nm is required for the ionization efficiency exceeding 10 % of slow 87Rb atoms with the incident speed of 10 cm/s. The throughput of near-field light increases with wavelength for the s-polarization, but decreases with wavelength for the p-polarization.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Tomohiro Sato and Haruhiko Ito
"Generation of near-field light at a nanoslit with rounded edges", J. Nanophoton. 5(1), 053501 (March 11, 2011). ; http://dx.doi.org/10.1117/1.3543818


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