한국광학회지 (Korean Journal of Optics and Photonics)

  • 제17권4호
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  • Pages.371-380
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  • 2006
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  • 1225-6285(pISSN)
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  • 2287-321X(eISSN)
한국광학회 (Optical Society of Korea)
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금속선 광 도파로를 이용한 장거리 표면-플라즈몬 파장가변 필터

Tunable Wavelength Filters Based on Long-Range Surface-Plasmon-Polariton waveguides

  • 김기철 (한양대학교 물리학과 마이크로광학 연구실) ;
  • 송석호 (한양대학교 물리학과 마이크로광학 연구실) ;
  • 원형식 ((주)삼성전기 중앙연구소) ;
  • 이관수 ((주)삼성전기 중앙연구소)
  • Kim, Ki-Cheol (Department of Physics, Hanyang University) ;
  • Song, Seok-Ho (Department of Physics, Hanyang University) ;
  • Won, Hyong-Sik (Central Research Institute of Samsung Electro-Mechanics Company) ;
  • Lee, Gwan-Su (Central Research Institute of Samsung Electro-Mechanics Company)
  • 발행 : 2006.04.01
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초록

금으로 된 금속선 광 도파로를 따라 속박되는 장거리 표면 플라즈몬을 이용하여 파장 가변 필터를 설계하고 제작하였다. 실리콘 기판 위에 제작된 금속선 도파로는 두 층의 열광학 폴리머 사이에 샌드위치 구조로 끼어 있도록 설계되었다. 도파로의 바로 윗면에는 유전체로 된 Bragg 회절격자가 적합한 주기로 제작되어, 중심 파장이 광통신 파장대 (1520$\sim$1570 nm)에 있으면서 높은 소광률($\sim$25 dB)을 갖는 파의 반사가 가능했고, 전체손실은 25 dB/cm 이하로 나타났다. 또한, 제작된 파장 가변 필터가 폴리머의 열-광학적 특성에 의해 파장가변 필터 소자로서의 응용이 가능함을 확인했으며, 금속선 광 도파로에 직접 연결된 전극 구조에 동시에 가해준 전류에 의해 파장이 가변 될 수 있음을 실험적으로 확인하였다.

We design and fabricate a novel tunable wavelength filter, which utilizes long-range surface plasmon-polaritons excited along nm-thick-metal strips. A gold metal strip, with $\sim$ cm length, 20 nm thickness, and $\sim$ 5$\mu$m width, is embedded in thick thermo-optic Polymer films supported by a silicon wafer. A dielectric Bragg grating structure is Placed on the metal strip, so that transmission signals at telecom wavelength are selected by thermal effect of the thermo-optic polymer. High extinction ratio of 25 dB and total insertion loss of $\sim$25 dB/cm can be measured by single-mode coupling of optical fibers. We also verify that wavelength tuning of the long-range surface plasmon-polariton filters can be achieved by electric current directly applied to the metal-strip waveguides.

키워드

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