Polarization-independent beam splitting by a photonic crystal right prism
- 301 Downloads
Splitting of light waves by a two-dimensional photonic crystal associated with source size and dispersion relation of photonic crystal at a wavelength of 1,550 nm without disturbing periodicity is numerically demonstrated via finite-difference time-domain simulations. Split branches in either polarization state make plus or minus 45° with the  direction and propagate in a self-collimated manner with equal amplitude and phase. Sixty-four percent of total transmittance is attained provided that the waves are coupled and collected through appropriate planar waveguides. Alternatively, approximately 50 % total transmittance for both polarizations can be obtained by application of an anti-reflection coating layer at the input face. Polarization-independent beam splitting occurs in a narrow range around the target wavelength, while its transverse-magnetically polarized sub-harmonic can also be split. The photonic crystal can also operate as a polarizing splitter at oblique incidence.
KeywordsPhotonic Crystal Beam Splitting Transverse Magnetic Transverse Electric Planar Waveguide
- 21.Y. Shen, J. Zhou (2011) Positive-negative birefraction phenomenon for TM polarization in annular photonic crystal. Chin. Opt. Lett. 9(2), 1–4Google Scholar
- 22.G.Y. Dong, J. Zhou, X.L. Yang, X. Meng, Multi-refraction with same polarization state in two dimensional triangular photonic crystals. Prog. Electromagn. Res. 128, 91–103 (2012)Google Scholar
- 25.L. Xia, X. Wei, J. Yurong, Effect of source parameters on beam self-collimation in 2d photonic crystal. In Optical Fiber Communication and Optoelectronics Conference, 2007 Asia, pp. 469–471 (2007)Google Scholar
- 36.A. Cicek, O.A. Kaya, B. Ulug, Acoustic beam splitting in a sonic crystal around a directional band gap. Chin. Phys. B (2013) submittedGoogle Scholar