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Lasing action from photonic bound states in continuum.

Ashok Kodigala¹, Thomas Lepetit¹, Qing Gu¹

¹Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093-0407, USA.

|January 13, 2017

Summary

Bound states in the continuum (BICs) are non-decaying resonances. Researchers achieved room-temperature lasing action from optically pumped BIC cavities, demonstrating BIC lasers for the first time.

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Area of Science:

Wave physics
Quantum mechanics
Nanophotonics

Background:

Bound states in the continuum (BICs) were theoretically predicted in 1929.
Initially considered a mathematical curiosity, BICs were later linked to physical phenomena in semiconductor superlattices.
BICs are a general wave phenomenon observed in acoustics, microwaves, and nanophotonics, but experimental realization in lasers remained elusive.

Purpose of the Study:

To experimentally demonstrate lasing action from a bound state in the continuum (BIC) cavity.
To investigate the properties of BIC lasers, including wavelength scaling and robustness.
To explore the potential of BIC lasers in light-matter interaction and as vector beam sources.

Main Methods:

Fabrication of BIC cavities using arrays of cylindrical nanoresonators.
Optical pumping of the BIC cavities at room temperature.
Experimental measurement of lasing wavelength and its dependence on nanoresonator radius.

Main Results:

Achieved room-temperature lasing action from an optically pumped BIC cavity.
Demonstrated that the lasing wavelength scales with nanoresonator radius, matching theoretical predictions.
Showed that lasing persists in scaled-down BIC cavities (as small as 8x8 nanoresonators).

Conclusions:

The experimental realization of BIC lasers opens new possibilities for studying light-matter interactions.
BIC lasers are intrinsically linked to topological charges and serve as natural vector beam sources.
These findings have potential applications in optical trapping, biological sensing, and quantum information.