확대된 실효 면적을 갖는 공기홀 광결정 도파로의 연구
Investigation for Effective Mode Area Enlargement in Hollow Air-core Photonic Crystal Waveguides
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초록
최근에 정보통신기술의 전례 없는 성공은 21세기에 인터넷 접속에 대한 폭발적인 수요 증가를 선도하고 있다. 관련하여 전자들에 작용하는 원자 포텐셜에 유사하게, 광결정은 전자기파의 전파가 금지되는 주파수 영역을 포함하기 때문에, 광결정 구조에서 빛반사 원리는 많은 유리한 광학적 현상을 유도할 수 있다. 그럼으로써 작동하는 파장에 따라, 전자기파가 광결정 구조를 통하여 전파될지 안될지를 효과적으로 제어할 수 있게 된다. 더하여 중심에 공기홀을 추가하여 설계함으로써, 본 연구에서와 같이 공기홀 광결정 도파로가 넓은 실효 면적을 갖는 전파 특성을 나타낼 수 있는 방안을 모색한다. 본 연구에서 설계된 우수한 전파 성능을 보이는 원통형 공기홀 광결정 도파로에 대하여 산출된 실효 면적은 동작 파장 λ = 1.3 μm일 때 198.76 μm2이고, λ = 1.55 μm일 때는 200.24 μm2로서 일반적인 형태의 광결정 도파로보다도 각각 약 44.16 μm2과 44.38 μm2만큼 확대된 결과를 보인다. 여기서의 연구 결과들은 광신호 정보 통신 성능 향상을 위한 자료로 활용될 수 있을 것으로 기대된다.
Abstract
In recent years, the unprecedented success of information technology leads a tremendous growth in demand for the Internet access in the 21st century. Closely akin to the atomic potential acting on electrons as one special related research, since a photonic crystal possesses a forbidden frequency band, called a photonic band-gap, in which propagation of electromagnetic waves is prohibited, the light-reflection principle in the photonic crystal structure medium can produce many of the analogous optical phenomena. Thereby, electromagnetic waves are effectively controlled either to propagate through the light-wave communication medium or not, depending on operating wavelengths. In this research, a hollow air-core photonic crystal waveguide (HAPCW) for the effective mode area enlargement of electromagnetic characteristics has been first designed and explored by including a central air hole. The HAPCW design structure showing superior results provides effective areas of 198.76 μm2 and 200.24 μm2 at the operating wavelengths of 1.3 μm and 1.55 μm, respectively, for the fundamental mode, which are enlarged by 44.16 μm2 and 44.38 μm2, compared with the regular cylindrical photonic crystal waveguide. Findings in this investigation are expected to be capable of providing materials for communication performance improvement in the light information transmission by reducing serious signal distortion, due to the effective mode area enlargement.
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