Whispering gallery modes in bowl-shaped stilbene microresonators
Whispering gallery modes in bowl-shaped stilbene microresonators
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DOI：
10.1016/j.jlumin.2021.118654
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发表时间：
2022-03
影响因子：
3.6
通讯作者：
Akihiro Kameda;Hiroyuki Tajima;Jun-ichi Yamada;T. Komino
中科院分区：
文献类型：
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作者：
Akihiro Kameda;Hiroyuki Tajima;Jun-ichi Yamada;T. Komino
研究了碗状微谐振器中的回音壁模式（WGM）谐振。这些谐振器是在直径为20 μ m的二苯乙烯衍生物4，4 ′-双[（N-咔唑）苯乙烯基]联苯的二氧化硅微球上制备的。光致发光（PL）光谱显示周期性的峰，这是由于放大自发辐射（ASE）在WGM的本征波长。ASE阈值（Ith）取决于峰值波长，在482 nm处的最小值为4 μ J mm − 2。当在随机堆叠的二氧化硅微球上制造微碗时，在WGM之间没有观察到模式耦合。这是一个主要的区别，从微盘的行为，表现出远程模式耦合。微盘和微碗都是由相同的材料制成的，但微盘中的芪沉积在表面用二氧化硅微盘装饰的基底上。微碗和微盘之间的主要结构差异涉及WGM谐振器之间的平面芪薄膜的存在或缺乏;薄膜模式预期充当相邻WGM之间的模式耦合器。因此，微碗之间的模式耦合的缺乏支持我们的模型，即远程模式耦合的微盘实现交联的WGM通过薄膜模式。
Whispering gallery mode (WGM) resonance was investigated in bowl-shaped microresonators. These resonators were fabricated on 20-μm-diameter silica microspheres from the stilbene derivative 4,4′-bis[(N-carbazole)styryl]biphenyl. Photoluminescence (PL) spectra showed periodic peaks that resulted from amplified spontaneous emission (ASE) at the eigen-wavelength of the WGM. The ASE threshold (Ith) was dependent on the peak wavelength and had a minimum value of 4 μJ mm−2at 482 nm. When the microbowls were fabricated on randomly stacked silica microspheres, no mode coupling was observed among the WGMs. This is a major difference from the behavior of microdisks, which exhibit long-range mode coupling. The microdisks and microbowls were both fabricated from the same materials, but the stilbene in the microdisks was deposited on substrates with surfaces that were decorated with silica microdisks. The main structural difference between the microbowls and the microdisks concerned the presence or lack of a planar stilbene thin film between the WGM resonators; the thin film mode is expected to act as the mode coupler between adjacent WGMs. Therefore, the lack of mode coupling among the microbowls supports our model that long-range mode coupling in the microdisks was realized by crosslinking of the WGMs via the thin film mode.