Increase of Q-factor in photonic crystal H1-defect nanocavities after closing of photonic bandgap with optimal slab thickness.
Increase of Q-factor in photonic crystal H1-defect nanocavities after closing of photonic bandgap with optimal slab thickness.
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DOI：
10.1364/oe.16.000448
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发表时间：
2008-01
期刊：
影响因子：
3.8
通讯作者：
A. Tandaechanurat;S. Iwamoto;Masahiro Nomura;N. Kumagai;Y. Arakawa
中科院分区：
文献类型：
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作者：
A. Tandaechanurat;S. Iwamoto;Masahiro Nomura;N. Kumagai;Y. Arakawa
我们研究了光子晶体H1缺陷纳米腔中偶极模的品质因数Q对板厚的依赖关系，并在数值模拟和实验中观察到即使在光子带隙关闭后Q也会增加。这种违反直觉的行为是由于光子晶体平板中腔模和第二导模之间的弱耦合造成的。这是通过计算它们在动量空间中的重叠来证实的。
We investigate the dependence of quality factor Q of dipole modes in photonic crystal H1-defect nanocavity on the slab thickness and observe an increase of Q even after closing of the photonic bandgap both in numerical simulation and experimentation. This counter intuitive behavior results from the weak coupling between the cavity mode and the 2nd-guided mode in the photonic crystal slab. This is confirmed by computing the overlap between them in the momentum space.