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Updated: May 23, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Integrated all-optical infrared switchable plasmonic quantum cascade laser.

John Kohoutek¹, Alireza Bonakdar, Ryan Gelfand

¹Bio-Inspired Sensors and Optoelectronics Laboratory (BISOL), EECS, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208, USA.

|April 5, 2012

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We developed an all-optical switch for infrared lasers. This device uses near-field interactions to control midwave infrared laser output, enabling novel optical modulation methods.

Area of Science:

Optoelectronics
Nanophotonics
Quantum Cascade Lasers

Background:

Quantum cascade lasers (QCLs) are crucial semiconductor devices for infrared applications.
All-optical switching offers advantages in speed and integration for optical signal processing.

Purpose of the Study:

To demonstrate a novel all-optical switch for modulating midwave infrared (MWIR) laser output.
To investigate near-field interactions for controlling far-field laser properties.

Main Methods:

Utilized cross-polarized bowtie antennas and a germanium nanoslab for near-field light confinement.
Employed 1.55 μm telecommunication wavelength light to induce changes in germanium refractive index via free carrier absorption.
Monitored the modulation of 6.1 μm MWIR laser intensity.

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Last Updated: May 23, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Main Results:

Achieved significant modulation of the 6.1 μm laser intensity through near-field interaction.
Demonstrated that perturbation of germanium's refractive index by short-wavelength light alters the plasmonic antenna's optical response.
Confirmed the viability of using near-field effects to control far-field laser emission.

Conclusions:

Presented a functional infrared switchable plasmonic quantum cascade laser.
This work provides a new pathway for all-optical modulation of infrared lasers.
The device integrates near-field light manipulation with far-field laser output control.