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TM-like and TE-like Modes Coupling in a Two-Dimensional Photonic Crystal Slab Composed of Truncated Cone Silicon Rods |
| XIONG Zhi-Gang;LI Zhi-Yuan;ZHANG Dao-Zhong |
| Optical Physics Laboratory, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 |
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XIONG Zhi-Gang, LI Zhi-Yuan, ZHANG Dao-Zhong 2008 Chin. Phys. Lett. 25 2089-2092 |
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Abstract We numerically investigate the coupling of TE-like modes and TM-like modes in a two-dimensional (2D) photonic crystal (PC) slab composed of truncated cone silicon rods. In such structures, the classification of TE-like modes and TM-like modes is generally impossible and the coupling occurs due to vertical structural asymmetries. The frequency and wavevector dependences of the mode coupling are discussed by investigating the photonic band structures, and the coupling efficiency is studied by examining the transmittance. The results show that the efficiency of mode conversion is strengthened by the vertical asymmetry and weakened by the clear small gap. These structures could be used as polarization conversion devices in integrated optics.
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| Keywords:
42.70.Qs
42.25.Bs
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Received: 05 March 2008
Published: 31 May 2008
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| PACS: |
42.70.Qs
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(Photonic bandgap materials)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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