Proceedings of the Optical Society of Korea Conference (한국광학회:학술대회논문집)

Optical Society of Korea (한국광학회)
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Beam focusing by a single subwavelength metal slit surrounded by chirped dielectric surface gratings

금속 슬릿 주변에 유전체 chirped grating을 배열함으로써 구현한 beam focusing

  • 김세윤 (서울대학교 전기공학부 액티브 플라즈모닉스 응용 시스템 창의연구단) ;
  • 박정현 (서울대학교 전기공학부 액티브 플라즈모닉스 응용 시스템 창의연구단) ;
  • 임용준 (서울대학교 전기공학부 액티브 플라즈모닉스 응용 시스템 창의연구단) ;
  • 김휘 (서울대학교 전기공학부 액티브 플라즈모닉스 응용 시스템 창의연구단) ;
  • 이병호 (서울대학교 전기공학부 액티브 플라즈모닉스 응용 시스템 창의연구단)
  • Published : 2007.07.01
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Abstract

We propose a novel method for the beam focusing by a single subwavelength metal slit surrounded by chirped dielectric surface gratings. In the proposed method, the period of each grating is chirped to make a focused beam at the desired position. Design of the grating structures for optimal beam focusing and the analysis of the field distribution are conducted based on the rigorous coupled wave analysis (RCWA). It is shown that the focused beam is formed at 1.5${\mu}m$ from the metal substrate and its full width at half maximum (FWHM) is 411nm.

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