Bianucci P, Wang X, Veinot J G, Meldrum A
Department of Physics, University of Alberta, Edmonton AB, T6G 2G7, Canada.
Opt Express. 2010 Apr 12;18(8):8466-81. doi: 10.1364/OE.18.008466.
Bottle resonators can support high Q-factor whispering gallery modes (WGMs) and demonstrate a rich mode spectrum. Resonators were fabricated using a fiber tapering apparatus and were coated with a thin, smooth layer of luminescent silicon nanocrystals. The photoluminescence spectrum showed WGM peaks with Q-factors near 2,500; however, evanescent measurements showed that these modes are a composite of many modes with Q-factors exceeding 106, the highest yet seen for a silicon-nanocrystalcoated microresonators. The mode structure showed strong polarization and sensitivity to position within the bottle resonator. An analysis of loss mechanisms establishes surface roughness scattering as the limiting factor in these nanocrystal-coated bottle resonators in the absence of excited carriers.
瓶形谐振器可以支持高Q值的回音壁模式（WGMs），并展现出丰富的模式光谱。谐振器是使用光纤拉锥设备制造的，并涂覆有一层薄而光滑的发光硅纳米晶体层。光致发光光谱显示出Q值接近2500的WGM峰；然而，倏逝场测量表明，这些模式是许多Q值超过10^6的模式的复合，这是迄今在硅纳米晶体涂层微谐振器中所见到的最高值。模式结构表现出强烈的偏振特性以及对瓶形谐振器内位置的敏感性。对损耗机制的分析表明，在没有激发载流子的情况下，表面粗糙度散射是这些纳米晶体涂层瓶形谐振器中的限制因素。
