Abstract
A diamond-structured photonic crystal (PC) with graded air spheres radii was fabricated successfully by stereolithography (SL) and gel-casting process. The graded radii in photonic crystal were formed by uniting different radii in photonic crystals with a uniform radius together along the Г-Х <100> direction. The stop band was observed between 26.1 GHz and 34.3 GHz by reflection and transmission measurements in the direction. The result agreed well with the simulation attained by the Finite Integration Technique (FIT). The stop band width was 8.2 GHz and the resulting gap/midgap ratio was 27.2%, which became respectively 141.4% and 161.9% of the perfect PC. The results indicate that the stop band width of the diamond-structured PC can be expanded by graded air spheres radii along the Г-Х <100> direction, which is beneficial to develop a multi bandpass filter.
Highlights
Photonic crystals (PCs) are periodic dielectric media in one, two, or three dimensional directions, which form a photonic bandgap and manipulate the propagation of light or electromagnetic waves with a wavelength comparable to the periodicity [1]
A diamond-structured PC with the same lattice constant but a graded air spheres radii was successfully fabricated by stereolithography (SL) and a gel-casting process and its stop band properties along the Г-Х direction were investigated
With the aspect ratio of the PCs increasing, the measured stop band width increased from 2.4 GHz to 5.8 GHz and the gap/midgap ratio increased from 9.1% to 16.8%
Summary
Photonic crystals (PCs) are periodic dielectric media in one, two, or three dimensional directions, which form a photonic bandgap and manipulate the propagation of light or electromagnetic waves with a wavelength comparable to the periodicity [1]. Little work has been done on broadening the stop band width by graded radii in a PC. Kirihara et al investigated the influence of changing the rod diameter of the lattice separately on the bandgap property in rod-connected diamond-structured PC. In their works, the volume fraction (β) of the dielectric medium was modified from 14% to 33% by changing the rod diameter of the lattice. A diamond-structured PC with the same lattice constant but a graded air spheres radii was successfully fabricated by stereolithography (SL) and a gel-casting process and its stop band properties along the Г-Х direction were investigated. Experimental results were compared with the Finite Integration Technique (FIT) simulation results
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