Ring-type Fabry-Pérot filter based on the self-collimation effect in a 2D photonic crystal.
We propose a ring-type Fabry-Pérot filter (RFPF) based on the self-collimation effect in photonic crystals. The transmission characteristics of self-collimated beams are experimentally measured in this structure and compared with the results obtained with the simulations. Bending and splitting mechanisms of light beams by the line defects introduced into the RFPF are used to control the self-collimated beam. Antireflection structures are also employed at the input and output photonic crystal interfaces in order to minimize the coupling loss. Reflectance of the line-defect beam splitters can be controlled by adjusting the radius of defect rods. As the reflectance of the line-defect beam splitters increases, the transmission peaks become sharper and the filter provides a Q-factor as high as 1037. Proposed RFPF can be used as a sharply tuned optical filter or as a spectrum analyzer based on the self-collimation phenomena of photonic crystals. Furthermore, it is suitable for a building block of photonic integrated circuits, as it does not back reflect any of the incoming self-collimated beams owing to the antireflection structure applied.
Kim
Teun-Teun
TT
Department of Physics, KAIST, Daejon 305-701, Korea.
Lee
Sun-Goo
SG
Kim
Seong-Han
SH
Kim
Jae-Eun
JE
Park
Hae Yong
HY
Kee
Chul-Sik
CS
D003198:Computer Simulation; D003460:Crystallization / Q000295:instrumentation; D004867:Equipment Design; D005374:Filtration / Q000295:instrumentation*; D008027:Light; D055096:Optical Devices; D017785:Photons; D012542:Scattering, Radiation