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Laser the size of a virus particle: Miniature laser operates at room temperature and defies the diffraction limit of light

Date:
November 5, 2012
Source:
Northwestern University
Summary:
A research team has found a way to manufacture single laser devices that are the size of a virus particle and that operate at room temperature. These plasmonic nanolasers could be readily integrated into silicon-based photonic devices, all-optical circuits and nanoscale biosensors.
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Laser light show. Lasers developed on a much smaller scale -- plasmonic nanolasers -- could be integrated into silicon-based photonic devices, all-optical circuits and nanoscale biosensors.
Credit: © Digishooter / Fotolia

A Northwestern University research team has found a way to manufacture single laser devices that are the size of a virus particle and that operate at room temperature. These plasmonic nanolasers could be readily integrated into silicon-based photonic devices, all-optical circuits and nanoscale biosensors.

Reducing the size of photonic and electronic elements is critical for ultra-fast data processing and ultra-dense information storage. The miniaturization of a key, workhorse instrument -- the laser -- is no exception.

The results are published in the journal Nano Letters.

"Coherent light sources at the nanometer scale are important not only for exploring phenomena in small dimensions but also for realizing optical devices with sizes that can beat the diffraction limit of light," said Teri Odom, a nanotechnology expert who led the research.

Odom is the Board of Lady Managers of the Columbian Exposition Professor of Chemistry in the Weinberg College of Arts and Sciences and a professor of materials science and engineering in the McCormick School of Engineering and Applied Science.

"The reason we can fabricate nano-lasers with sizes smaller than that allowed by diffraction is because we made the lasing cavity out of metal nanoparticle dimers -- structures with a 3-D 'bowtie' shape," Odom said.

These metal nanostructures support localized surface plasmons -- collective oscillations of electrons -- that have no fundamental size limits when it comes to confining light.

The use of the bowtie geometry has two significant benefits over previous work on plasmon lasers: (1) the bowtie structure provides a well-defined, electromagnetic hot spot in a nano-sized volume because of an antenna effect, and (2) the individual structure has only minimal metal "losses" because of its discrete geometry.

"Surprisingly, we also found that when arranged in an array, the 3-D bowtie resonators could emit light at specific angles according to the lattice parameters," Odom said.


Story Source:

The above post is reprinted from materials provided by Northwestern University. The original item was written by Megan Fellman. Note: Materials may be edited for content and length.


Journal Reference:

  1. Jae Yong Suh, Chul Hoon Kim, Wei Zhou, Mark D. Huntington, Dick T. Co, Michael R. Wasielewski, Teri W. Odom. Plasmonic Bowtie Nanolaser Arrays. Nano Letters, 2012; 121003094342000 DOI: 10.1021/nl303086r

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Northwestern University. "Laser the size of a virus particle: Miniature laser operates at room temperature and defies the diffraction limit of light." ScienceDaily. ScienceDaily, 5 November 2012. <www.sciencedaily.com/releases/2012/11/121105172336.htm>.
Northwestern University. (2012, November 5). Laser the size of a virus particle: Miniature laser operates at room temperature and defies the diffraction limit of light. ScienceDaily. Retrieved July 4, 2015 from www.sciencedaily.com/releases/2012/11/121105172336.htm
Northwestern University. "Laser the size of a virus particle: Miniature laser operates at room temperature and defies the diffraction limit of light." ScienceDaily. www.sciencedaily.com/releases/2012/11/121105172336.htm (accessed July 4, 2015).

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