Near-field optics with photonic crystals |
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Authors: | SA Magnitskii AV Tarasishin AM Zheltikov |
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Institution: | (1) International Laser Center, Physics Faculty, Moscow State University, Moscow, 11989, Russia (Fax: +7-095/939-3113, E-mail: zhelt@ilc.phys.msu.su), RU |
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Abstract: | Finite-difference time-domain (FDTD) analysis of light propagation in a defect mode of a two-dimensional photonic band-gap
(PBG) structure demonstrates that the light field is localized in such a structure within areas with subwavelength (λ/10)
sizes. FDTD simulations reveal efficient formation of an evanescent wave at the output of such a PBG structure, permitting
the subwavelength resolution to be achieved in the near field. A probe object with a size less than the wavelength of incident
light is shown to perturb the near-field distribution behind the PBG structure and to change the signal detected in the far-field
zone. The field intensity distribution inside a PBG structure is also sensitive to the presence of a probe object, offering
a way to control the light field localized in defect modes of PBG structures.
Received: 9 August 1999 / Accepted: 18 October 1999 / Published online: 10 November 1999 |
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Keywords: | PACS: 41 20 Bt 42 79 -e |
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