Ultrahigh-Q of the L3 photonic crystal microcavity

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• 作者：Ahlem Benmerkhi ; Mohamed Bouchemat ; Touraya Bouchemat
• 关键词：FDTD ; Microcavity ; Photonic crystal ; Waveguide
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：124
• 期：22
• 页码：5719-5722
• 全文大小：1531 K

文摘

In this paper, we theoretically investigate the L3 cavity with three missing holes in the center. They are of great interest for the realization of low threshold laser nanosources and for a strong interaction between the cavity and sources. In order to improve the transmission and Q factor simultaneously of these structure, by reducing unwanted reflection due to mismatch and through minimization of propagation losses, we modified L3 geometry: three missing holes in a line where both lateral displacement of the first hole adjacent to the cavity, d, and their radius, r, were changed. A photonic microcavity with a high Q factor of 1.8741 ¡Á 10⁷ and a modal volume V of 0.351 is demonstrated. We demonstrate that the calculated Q factor for the designed cavity increases by a factor of 49 relative to that for a cavity without displaced and reduced air holes, while the modal volume remains almost constant.