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Sub-bandgap transverse frequency conversion in semiconductor nano-waveguides.

Fuxing Gu1, Li Zhang, Guoqing Wu

  • 1Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China. hpzeng@phy.ecnu.edu.cn.

Nanoscale
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Summary
This summary is machine-generated.

Transverse frequency conversion in semiconductor nanostructures offers tunable light emission. This method provides lower divergence and higher polarization compared to birefringent approaches, enabling advanced optical applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Investigating light-matter interactions in semiconductor nanostructures is crucial for developing novel photonic devices.
  • Sub-bandgap frequency conversion is a key process for generating light in specific spectral regions.
  • Semiconductor nanowires and nanoribbons offer unique optical properties due to their reduced dimensions.

Purpose of the Study:

  • To explore transverse frequency conversion in semiconductor nanowires and nanoribbons.
  • To analyze the influence of nanostructure geometry and surrounding media on emission properties.
  • To compare the performance of transverse frequency conversion with traditional birefringent methods.

Main Methods:

  • Utilized continuous-wave (CW) lasers with low pump power (< 1 mW) for excitation.
  • Investigated frequency conversion in semiconductor nanowires and nanoribbons with varying cross-sectional geometries.
  • Analyzed emission properties, including polarization and spatial distribution, under different waveguide modes.

Main Results:

  • Emission properties strongly depend on the cross-sectional geometry and surrounding media of the nano-waveguides.
  • Higher polarization was observed in nano-waveguides operating under single-mode conditions.
  • More tunable spatial distribution was achieved in nano-waveguides involving higher-order modes.

Conclusions:

  • Transverse frequency conversion in semiconductor nanostructures is a viable method for sub-bandgap light generation.
  • The geometry and surrounding medium of nanostructures significantly impact conversion efficiency and emission characteristics.
  • Transverse frequency conversion demonstrates advantages over birefringent approaches, including lower divergence, higher polarization, and tunable spatial distribution.