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Updated: Jun 17, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Electrically controllable photonic molecule laser.

G Fasching1, Ch Deutsch, A Benz

  • 1Photonics Institute, Vienna University of Technology, Gusshausstr 27, 1040 Wien, Austria. gernot.fasching@tuwien.ac.at

Optics Express
|December 10, 2009
PubMed
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We demonstrated electrically controllable coupling between two microdisk terahertz quantum-cascade lasers. This photonic molecule enables conditional optical emission switching by modulating just one laser, showing gain dependence on electric fields.

Area of Science:

  • Optics and Photonics
  • Quantum Electronics
  • Semiconductor Lasers

Background:

  • Microdisk lasers offer compact, single-mode operation.
  • Terahertz quantum-cascade lasers (TQCLs) are crucial for various applications.
  • Coupling microcavities can create novel optical functionalities.

Purpose of the Study:

  • To investigate coherent intercavity coupling of evanescent fields in two microdisk TQCLs.
  • To demonstrate electrically controllable optical coupling and its dependence on intercavity spacing.
  • To explore the formation of a coupled photonic molecule and its switching capabilities.

Main Methods:

  • Fabrication of two microdisk terahertz quantum-cascade lasers.
  • Experimental study of evanescent field coupling for varying cavity spacings (up to 30 µm).

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  • Electrical modulation of one microdisk to observe effects on the coupled system.

    • Main Results:

    • Electrically controllable optical coupling was achieved for spacings up to 30 µm.
    • A strongly coupled photonic molecule was formed at 2 µm intercavity spacing.
    • Conditional switching of optical emission was demonstrated by modulating a single microdisk.
    • Lasing threshold characteristics revealed a linear dependence of TQCL gain on applied electric field.

    Conclusions:

    • Coherent intercavity coupling of microdisk TQCLs is feasible and electrically controllable.
    • The coupled system behaves as a photonic molecule with unique switching properties.
    • The observed gain dependence provides insights into quantum-cascade laser physics.