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arXiv 1002.3843physics.optics
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光纤锥形波导诱导的混合间隙模:在沉积于薄膜上的单固态发射体光谱学中的应用

Hybrid gap modes induced by fiber taper waveguides: application in spectroscopy of single solid-state emitters deposited on thin films

Marcelo Davanco Kartik Srinivasan

摘要:

我们表明,通过模拟,光纤锥形波导可以是一个有效的工具,用于光致发光和谐振,消光光谱的单个发射器,如分子或胶体量子点,沉积在薄的电介质膜的表面上。放置在高折射率膜上,锥形光纤波导引起混合模式波的形成,类似于介电开槽波导模式,其在低折射率间隙区域中提供强场限制。这种间隙限制波的可用性产生潜在的高自发发射增强因子($\approx20$)、荧光收集效率($\approx 23%$)和透射消光($\approx 20%$)水平。预测的荧光和消光水平的两个改善的因素,如果膜,而不是用一个悬浮的通道波导。两种配置,在可见光($\approx 600 \nm$)和近红外($\approx 1300 \nm$)光谱范围内的操作进行了评估,表现出类似的性能。

英文摘要:

We show, via simulations, that an optical fiber taper waveguide can be an efficient tool for photoluminescence and resonant, extinction spectroscopy of single emitters, such as molecules or colloidal quantum dots, deposited on the surface of a thin dielectric membrane. Placed over a high refractive index membrane, a tapered fiber waveguide induces the formation of hybrid mode waves, akin to dielectric slotted waveguide modes, that provide strong field confinement in the low index gap region. The availability of such gap-confined waves yields potentially high spontaneous emission enhancement factors ($\approx20$), fluorescence collection efficiencies ($\approx 23%$), and transmission extinction ($\approx 20%$) levels. A factor of two improvement in fluorescence and extinction levels is predicted if the membrane is instead replaced with a suspended channel waveguide. Two configurations, for operation in the visible ($\approx 600 \nm$) and near-infrared ($\approx 1300 \nm$) spectral ranges are evaluated, presenting similar performances.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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