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Wave propagation in deep-subwavelength mode waveguides

机译:波在深亚波长模式波导中的传播

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摘要

This Letter proposes a dielectric waveguide with deep-subwavelength mode sizes. Results of both frequency domain and time domain analysis show that the effective mode area is below (lambda)_(0)~(2)/400 and can even reach (lambda)_(0)~(2)/1000 ((lambda)_(0) is the wavelength in vacuum). The effective electrical mode area can be comparable to that of a hybrid plasmonic sub-wavelength confinement waveguide, with reduced optical absorption. In contrast to slot waveguides, which guide light in low-index materials, the proposed structure guides light in high-index materials. Results obtained in this Letter show that the losses are sensitive to the surface roughness on the tens of nanometers scale. The structure can be used to design ring resonators with a quality factor comparable to that of a diffraction-limited dielectric ring resonator with the same standing wave numbers. The property can be applied in nonlinear effect enhancement or laser design with ultralow threshold.
机译:这封信提出了一种具有深亚波长模式尺寸的介电波导。频域和时域分析结果表明,有效模态面积在(lambda)_(0)~(2)/400以下,甚至可以达到(lambda)_(0)~(2)/1000(((lambda)_(0)为真空中的波长)。有效电模式面积可与混合等离子体亚波长约束波导相媲美,但光吸收降低。与在低折射率材料中引导光的狭缝波导相比,所提出的结构在高折射率材料中引导光。在这封信中获得的结果表明,损耗对数十纳米尺度的表面粗糙度很敏感。该结构可用于设计环形谐振器,其质量因数可与具有相同驻波数的衍射极限介电环形谐振器相媲美。该特性可用于非线性效应增强或超低阈值的激光设计。

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