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High-Q plasmonic bottle microresonator

机译：高Q等离子体瓶微谐振器

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摘要

In this paper, we demonstrate a hybrid plasmonic bottle microresonator (PBMR) which supports whispering gallery modes (WGMs) along with surface plasmon waves (SPWs) for high performance optical sensor applications. The BMR was fabricated through "soften-and-compress" technique with a thin gold layer deposited on top of the resonator. A polarization-resolved measurement was set-up in order to fully characterize the fabricated PBMR. Initially, the uncoated BMR with waist diameter of 181 μm, stem diameter of 125 μm and length of 400 μm was fabricated and then gold film was deposited on the surface. Due to surface curvature, the gold film covering half of the BMR had a characteristic meniscus shape and maximum thickness of 30 nm. The meniscus provides appropriately tapered edges which facilitate the adiabatic transformation of BMR WGMs to SPWs and vice versa. This results in low transition losses, which combined with partially-metal-coated resonator, can result in high hybrid-PBMR Q's. The transmission spectra of the hybrid PBMR are dramatically different to the original uncoated BMR. Under TE(TM) excitation, the PBMR showed composite resonances with Q of～2100(850) and almost identical ～ 3 nm FSR. We have accurately fitted the observed transmission resonances with Lorentzian-shaped curves and showed that the TE and TM excitations are actually composite resonances comprise of two and three partially overlapping resonances with Q's in excess of 2900 and 2500, respectively. To the best of our knowledge these are the highest Qs observed in plasmonic microcavities.
机译：在本文中，我们演示了一种混合等离子瓶微谐振器（PBMR），它支持回音壁模式（WGM）和表面等离激元波（SPW），用于高性能光学传感器应用。 BMR是通过“软压缩”技术制造的，在谐振器顶部沉积了一层薄金层。设置了偏振分辨测量，以充分表征所制造的PBMR。首先，制造腰围直径为181μm，杆直径为125μm，长度为400μm的未涂层BMR，然后在其表面沉积金膜。由于表面曲率，覆盖BMR一半的金膜具有特殊的弯月面形状，最大厚度为30 nm。弯液面提供适当的锥形边缘，这有助于将BMR WGM绝热转化为SPW，反之亦然。这导致较低的跃迁损耗，再加上部分镀有金属的谐振器，会导致高混合PBMRQ。混合型PBMR的透射光谱与原始的未涂层BMR显着不同。在TE（TM）激发下，PBMR表现出复合共振，其Q值为〜2100（850），并且几乎具有相同的〜3 nm FSR。我们用洛伦兹形曲线准确地拟合了观察到的传输共振，并表明TE和TM激发实际上是复合共振，包括两个和三个部分重叠的共振，Q分别超过2900和2500。据我们所知，这些是在等离子体微腔中观察到的最高Qs。

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