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Subwavelength Silicon Nanoblocks for Directional Emission Manipulation.

Tianyue Zhang1, Xuewei Li1, Jian Xu1

  • 1Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.

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Summary

This study introduces a simple silicon nanoblock acting as an all-dielectric nanoantenna. It efficiently controls light directionality for nanophotonic devices and sensing applications.

Keywords:
all-dielectric nanoantennasfluorescencenanophotonicsunidirectional emission

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Area of Science:

  • Nanophotonics
  • Dielectric Metasurfaces
  • Optical Antennas

Background:

  • Controlling light emission directionality is crucial for integrated nanophotonic devices.
  • Existing solutions often lack efficiency, multifunctionality, or compactness.

Purpose of the Study:

  • To theoretically propose and demonstrate a single dielectric silicon nanoblock as an efficient, multifunctional, and ultracompact all-dielectric nanoantenna.
  • To achieve unidirectional light scattering and switchable directive emission using the proposed nanoantenna.

Main Methods:

  • Theoretical modeling of a single dielectric silicon nanoblock.
  • Analysis of light scattering and emission patterns.
  • Investigation of multipolar electric and magnetic resonances.
  • Simulation of emitter-antenna coupling effects.

Main Results:

  • Demonstrated unidirectional scattering of plane waves.
  • Achieved switchable directive emission from localized emitters.
  • Identified multipolar resonances as the origin of high directionality.
  • Observed efficient beam redirection sensitive to emitter configuration.

Conclusions:

  • The proposed silicon nanoblock serves as a versatile nanoantenna for directing light.
  • Its simplicity, compactness, and low-loss characteristics are advantageous for sensing and optical nanocircuits.