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5 December 2005 Novel fractal cantor structures for super narrow bandpass filter
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Proceedings Volume 6020, Optoelectronic Materials and Devices for Optical Communications; 602035 (2005)
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China
In this paper, we present two new photonic crystal structures, which are composed of fractal Cantor multilayer with defects embedded in its middle. Optical transmission matrix method is used to calculating the transmittance and reflectance. Compared with general Cantor multilayer, we find these new structures have wider stopbands and show super narrow bands in the middle of wider stopbands. They can be served as super narrow bandpass filters. The pass band obtained can be less than 0.6nm near the infrared 1530 nm when there is a defect embedded in the cantor multilayer. The optical transmission in the center wavelength is higher than 99%. This means a very low insert loss. If there are three detected layers, three super narrow peaks can be found in the middle of the stopband. The center wavelengths are 1232.4 nm, 1372.8nm and 1538.3 nm, respectively. It is more superior to other kind narrow band filters. These kinds of photonic crystal super narrow band optical filters may find applications in super dense wavelength division multiplexing for optical communications and precise optical measurement.
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Zhong Yin Xiao and Zi Hua Wang "Novel fractal cantor structures for super narrow bandpass filter", Proc. SPIE 6020, Optoelectronic Materials and Devices for Optical Communications, 602035 (5 December 2005);

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