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Wavelength-selective directional coupling with dielectric-loaded plasmonic waveguides

机译:与介质加载的等离激元波导的波长选择性定向耦合

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摘要

We consider wavelength-selective splitting of radiation using directional couplers (DCs) formed by dielectric-loaded surface-plasmon-polariton waveguides (DLSPPWs). The DCs were fabricated by depositing sub-wavelength-sized polymer ridges on a gold film using large-scale UV photolithography and characterized at telecommunications wavelengths with near-field microscopy. We demonstrate a DLSPPW-based 45-(mu)m-long DC comprising 3 (mu)m offset S bends and 25-(mu)m-long parallel waveguides that changes from the "through" state at 1500 nm to 3 dB splitting at 1600 nm, and show that a 50.5-(mu)m-long DC should enable complete separation of the radiation channels at 1400 and 1620 nm. The DC performance is found to be in good agreement with full vectorial three-dimensional finite-element simulations.
机译:我们考虑使用定向耦合器(DC)对辐射进行波长选择分裂,该定向耦合器由介质加载的表面等离激元极化波导(DLSPPW)形成。通过使用大规模UV光刻技术在金膜上沉积亚波长尺寸的聚合物脊来制造DC,并使用近场显微镜在电信波长处对其进行表征。我们演示了一个基于DLSPPW的45μm长的DC,该DC包括3μm的偏移S弯头和25μm的平行波导,它们从1500 nm的“直通”状态变为3 dB分裂在1600 nm处,表明50.5-μm长的DC应该能够完全分离1400和1620 nm处的辐射通道。发现直流性能与全矢量三维有限元模拟非常吻合。

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