Abstract
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.
Highlights
Photonic crystals (PCs) [1,2,3], composed of periodic dielectric materials, have inspired great interest because they possess many unique properties to control the light propagation in PCs at the optical wavelength scale
We propose a ring-type Fabry-Pérot filter (RFPF) based on the self-collimation effect in photonic crystals
In order to reduce the unwanted reflections between the PC and the homogeneous background material, the Antireflection structures (ARSs) composed of 11 alumina rods with the radius RARS = 1.15 mm are introduced at the input and output interfaces of the PC-RFPF
Summary
Photonic crystals (PCs) [1,2,3], composed of periodic dielectric materials, have inspired great interest because they possess many unique properties to control the light propagation in PCs at the optical wavelength scale. The possibilities of implementing PC based wavelength filters into WDM systems have been discussed [4,5,6,7,8,9,10,11]. Various photonic devices based on this unique phenomenon have been investigated including a Mach-Zehnder interferometer and an asymmetric Mach-Zehnder filter [18,19]. Chen et al theoretically suggested a polarization-independent drop filter based on a PC ring resonator in a hole-type silicon photonic crystal [20]. There have been many solutions to reduce the reflection at the ends of a PC [21,22,23,24]
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