Existence of a photonic pseudogap for visible light in synthetic opals

被引:233
作者
Vlasov, YA [1 ]
Astratov, VN [1 ]
Karimov, OZ [1 ]
Kaplyanskii, AA [1 ]
Bogomolov, VN [1 ]
Prokofiev, AV [1 ]
机构
[1] AF IOFFE PHYS TECH INST,ANISOTROP MAT LAB,ST PETERSBURG 194021,RUSSIA
来源
PHYSICAL REVIEW B | 1997年 / 55卷 / 20期
关键词
D O I
10.1103/PhysRevB.55.R13357
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Synthetic opals, composed of submicron silica spheres close packed in a three-dimensional fee lattice, are shown to display photonic stop bands at optical frequencies. We have investigated the light attenuation within the stop band as a function of refractive index contrast. Based on measurements of the Bragg attenuation length and on theoretical considerations, we show that a prominent depletion of the photonic density of states (pseudogap) can be achieved in opals by adjusting the volume packing fraction of the spheres and increasing the refractive index of the pores. To approach the pseudogap criterion the pores of opal were impregnated with CdS nanocrystals. We find a dramatic decrease of the attenuation length in opal-CdS, which indicates the strong perturbation of photonic states.
引用
收藏
页码:13357 / 13360
页数:4
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