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Related Experiment Video

Updated: May 9, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
10:54

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Hybrid optical antenna with high directivity gain.

Alireza Bonakdar1, Hooman Mohseni

  • 1Bio-inspired Sensors and Optoelectronics Laboratory, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, USA.

Optics Letters
|August 2, 2013
PubMed
Summary

Researchers developed a novel hybrid optical antenna for efficient light coupling to quantum systems. This antenna significantly boosts quantum efficiency and directivity, outperforming existing technologies for applications like infrared sensors.

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Last Updated: May 9, 2026

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Area of Science:

  • Optics and Photonics
  • Quantum Technologies
  • Nanotechnology

Background:

  • Efficient coupling of optical modes to quantum absorbers/emitters is vital for infrared sensors, spectroscopy, and quantum metrology.
  • Achieving high quantum efficiency in deep subwavelength systems remains a significant challenge.

Purpose of the Study:

  • To propose and analyze a novel hybrid optical antenna for enhanced light-matter interaction.
  • To achieve high quantum efficiency and directivity for subwavelength quantum systems.

Main Methods:

  • A hybrid optical antenna design combining a photonic nanojet with a metallo-dielectric antenna.
  • Theoretical prediction and simulation of quantum efficiency and directivity gain.

Main Results:

  • Predicted quantum efficiency of approximately 50% for a semiconductor with a volume of ~λ³/170.
  • Achieved strong far-field coupling with an axial directivity gain of 16 dB, near the theoretical limit.
  • Demonstrated performance exceeding existing optical antennas by over an order of magnitude.

Conclusions:

  • The proposed hybrid antenna enables highly efficient coupling of far-field optical modes to quantum systems.
  • This technology offers a pathway to significantly improve performance in quantum sensing and metrology applications.
  • The antenna's ability to achieve high directivity without coherent sources broadens its applicability.