Study on the self-collimation phenomena of surface waves in structured metals = 구조화된 금속에서 생기는 표면파의 자기조준 현상에 관한 연구

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We demonstrate that surface waves in structured perfect electric conductors can be self-collimated using the finite-difference time-domain method. In this thesis, we consider the perfect electric conductor surface with a square array of square holes. The size of holes($d$) is $0.875a$ and the depth of holes($h$) is $a$. Using the finite-difference time-domain method, the band structure and the equifrequency contour of the surface wave modes are obtained for this structure. From the equifrequency contour the self-collimation frequency($f_p = 0.52 c/a$) is obtained. To demonstrate that the surface wave propagates with no spreading, we calculated the field distributions using the periodic boundary conditions. We found that the surface waves are collimated well in the lateral directions and confined well in the vertical directions. Moreover, we demonstrate the hybrid surface modes which exist in a structured metal surface can be collimated. The size of holes($d$) is $0.6a$ and the depth of holes($h$) is $a$. To model metals, the Drude model is used. The plasma frequency ($\\omega_p$) is $1$, and the damping constant is $0$. We found the self-collimation for this structure occurs for the frequency $f = 0.364c/a$. To analyze the propagation loss, we calculated the Q-factor and the propagation length for various damping constants. It is shown that the structured metal has loss larger than the simple surface plasmon structure.
Advisors
Park, Hae-Yongresearcher박해용researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2007
Identifier
263417/325007  / 020005189
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2007.2, [ viii, 61 p. ]

Keywords

surface plasmon; photonic crystal; self-collimation; 자기조준; 표면 플라즈몬; 광결정

URI
http://hdl.handle.net/10203/47415
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=263417&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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