Fujita Masayuki, Takahashi Shigeki, Tanaka Yoshinori, Asano Takashi, Noda Susumu
Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-Ku, Kyoto 615-8510, Japan.
Science. 2005 May 27;308(5726):1296-8. doi: 10.1126/science.1110417.
Inhibiting spontaneous light emission and redistributing the energy into useful forms are desirable objectives for advances in various fields, including photonics, illuminations, displays, solar cells, and even quantum-information systems. We demonstrate both the "inhibition" and "redistribution" of spontaneous light emission by using two-dimensional (2D) photonic crystals, in which the refractive index is changed two-dimensionally. The overall spontaneous emission rate is found to be reduced by a factor of 5 as a result of the 2D photonic bandgap effect. Simultaneously, the light energy is redistributed from the 2D plane to the direction normal to the photonic crystal.
抑制自发发光并将能量重新分配为有用的形式是包括光子学、照明、显示、太阳能电池甚至量子信息系统在内的各个领域取得进展的理想目标。我们通过使用二维（2D）光子晶体展示了自发发光的“抑制”和“重新分配”，其中折射率在二维方向上发生变化。由于二维光子带隙效应，总的自发发射率降低了5倍。同时，光能从二维平面重新分配到垂直于光子晶体的方向。
