Self-Absorption Effect in the Spatial Resolved Spectra of CdS Nano-Ribbon Optical Waveguide Observed by Near-Field Spectroscopy |
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| Authors: | Dan Liu An Lian Pan Gengzhao Xu Yongqiang Bai Xing Zhu Bing Suo Zou |
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| Institution: | (1) State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing, 100871, China;(2) National Center for Nanoscience and Nanotechnology, Beijing, 100080, China;(3) Nanoscale Physics & Device Lab, Institute of Physics, Chinese Academy of Sciences, Beijing, 100080, China |
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| Abstract: | Scanning near-field optical microscopy (SNOM) and spectroscopy were used to study the light emission characteristics of CdS
nano-ribbon optical waveguide. A continuous red-shift of photoluminescence (PL) spectra of such nano-ribbons with the increase
of the light propagation distance was observed. Near-field optical images indicate that CdS nano-ribbon can work well as an
optical waveguide. Quantitative calculation was made to demonstrate the PL attenuation with long propagation distance (typically
several hundreds μm). The red shift is attributed to self-absorption, which means re-absorption and re-emission among energy-valleys
with different energies of conduction bands. Our results draw attention to the spectral characteristics of nano-ribbon optical
waveguides, which are as important as intensity to the stability and veracity of information transmission. |
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| Keywords: | near-field optics nano-optics optical waveguide semiconductor photoluminescence (PL) |
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