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Kryształy fotoniczne to sztucznie wytwarzane struktury, które mogą pełnić rolę materiału bazowego do budowy elementów fotoniki. W pracy omówiono jedną z metod wytwarzania kryształów fotonicznych - tak zwaną litografię interferencyjną. Następnie przeanalizowano możliwość wykorzystania struktur kryształu fotonicznego do budowy optycznego czujnika gazów.
Rozważane są wybrane aspekty zastosowania dwuwymiarowych kryształów fotonicznych jako elementów aktywnych w optycznych czujnikach gazów. Działanie analizowanych czujników oparte jest na metodach spektroskopii absorpcyjnej. Możliwe do uzyskania w krysztale fotonicznym znaczące obniżenie prędkości grupowej światła, tzw. efekt powolnego światła (ang. slow light), podnosi efektywność oddziaływania pomiędzy...
The results of 3D FDTD calculations of out-of-plane radiation losses in slow light regime for a 2D Silicon-On-Insulator (SOI) Photonic Crystal (PhC) slab are presented. In a 2D PhC slab structure periodicity causes a scattering out of waveguiding modes to the radiating modes. Optical sensors based on 2D PhCs working in slow light regime call for long devices in order to make the path of light propagation...
In the following paper, designing, modeling and optimizing an optical coupler based on titanium dioxide TiO2 is described. A rectangular diffraction grating integrated with a TiO2 waveguide is modeled. The optimized parameter is the coupling efficiency. The following parameters are also considered: coupler length, grating period, and grating etching depth. Critical values of grating filling factor...
We propose a method of improving the performance of a planar grating-assisted contra-directional coupler for use as a photonic switch. By means of a nonuniform Bragg grating, rapid phase jumps are introduced within the reflection spectra of coupler supermodes. This creates a reflection peak of steep slopes, flat top, and desired width. Sample numerical results are given for realistic material and...
We outline a method of calculating the spectral response of a contra-directional grating-assisted optical coupler. Interference of reflected / transmitted supermodes is taken into account. Sample numerical results for a planar device are presented. The results include spectral response of a sole grating-assisted coupler, changes introduced by an additional coupler without grating and changes introduced...
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