深亚可见光波长尺度下混合等离子体环形谐振器
Hybrid plasmonic ring resonator at deep subwavelength scale in the visible spectrum
等离子体谐振器出现于过去的十年之中。我们可以采用压缩模场的方式来制造甚小体积器件和进一步增强光与物质的相互作用。我们提出了一种环形谐振器设计，该谐振器置于金属衬底之上，二者之间采用低介电常数的介质层分隔。此介质层的存在，可以支持高局域场的混合等离子体模式。我们采用时域有限差分法来计算谐振器的特性。通过改变腔体的几何尺寸和低介电常数介质层的厚度，可以得到一种具有高Q值（352）和甚小模式体积（0.0078 (λ/2n)^3 ~ 0.0001um^3）的设计结构，从而使该器件的帕赛尔系数达到了2.7 x 10^4。同时，谐振器的半径和厚度可以调节至纳米尺度，此时谐振器的Q值超过100，模式体积在0.01(λ/2n)^3的数量级上。总体而言，该种谐振器可以在深亚可见光波长的尺度上保持高Q值和甚小模式体积。此种谐振器在基础物理学研究和光子学、光电子学等领域具有很大的应用潜力，如可应用于弱耦合机制的腔量子电动力学以及低阈值激光器。
In the past decade, plasmonic resonators have emerged and exploited field compression to create ultra-small mode-volume devices and to enhance light-matter interactions. We propose a ring resonator on metal substrate separated by low-permittivity dielectric, which supports hybrid plasmonic modes with highly localized electromagnetic ?eld. Finite difference time domain (FDTD) method is used to calculate the properties of the ring resonator. By changing the cavity's geometry and low-permittivity dielectric's height, high quality factor of 354 along with ultra-compact mode confinement 0.0078 (λ/2n)3 ~ 0.0001um3 is achieved, leading to Purcell factor up to 2.7 x 104. Moreover, the mode volume remains of the order of 0.01(λ/2n)3 with quality factor bigger than 100 for a ring radius and thickness in the range of nanometers. The hybrid plasmonic ring resonator exhibits a trade-off between the high quality factor and the ultra-small mode volume at deep subwavelength scale in the visible spectrum. It holds great potential in fundamental physics and applications in photonics and optoelectronics, for instance, cavity quantum electrodynamics in weak coupling regime and low-threshold lasers.
史飞飞、龚欣、周杰、张昭宇
光电子技术物理学
环形谐振器混合等离子体深亚波长可见光谱
ring resonator hybrid plasmonic deep subwavelength visible spectrum
史飞飞,龚欣,周杰,张昭宇.深亚可见光波长尺度下混合等离子体环形谐振器[EB/OL].(2015-04-23)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/201504-354.点此复制
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