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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Published on: September 5, 2017

A room temperature low-threshold ultraviolet plasmonic nanolaser.

Qing Zhang¹, Guangyuan Li¹, Xinfeng Liu¹

¹Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.

Nature Communications

|September 24, 2014

Summary

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Researchers developed a room-temperature ultraviolet surface plasmon polariton laser. This breakthrough overcomes previous limitations, offering a low threshold for advanced biological and information technologies.

Area of Science:

* Optics and Photonics
* Materials Science
* Condensed Matter Physics

Background:

* Plasmonic nanolasers typically suffer from high thresholds or cryogenic temperatures, especially in the visible and ultraviolet regimes.
* The bending-back effect of surface plasmon (SP) dispersion complicates achieving SP lasing below 450 nm.
* Ohmic and radiation losses are significant challenges in visible-regime plasmonic nanolasers.

Purpose of the Study:

* To demonstrate the first strong room-temperature ultraviolet (~370 nm) surface plasmon polariton laser.
* To achieve an extremely low lasing threshold for ultraviolet nanolasers.
* To investigate the underlying mechanisms for efficient exciton-SP energy transfer and reduced losses.

Main Methods:

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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

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* Fabrication of a closed-contact planar semiconductor-insulator-metal interface.

* Optical characterization of the device under excitation.

* Analysis of excitation polarization-dependent lasing action.

Main Results:

* Demonstration of the first strong room-temperature ultraviolet (~370 nm) SP polariton laser.
* Achieved an extremely low threshold of ~3.5 MW cm⁻².
* Observed excitation polarization-dependent lasing, attributed to exciton-SP energy transfer.

Conclusions:

* A closed-contact planar interface effectively reduces scattering loss and enhances exciton-SP energy transfer.
* This approach provides sufficient optical gain to overcome losses, enabling room-temperature UV lasing.
* The study advances understanding of hybrid plasmonic waveguide lasers and offers a pathway for UV nanolasers in biological and information technologies.