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World's smallest semiconductor laser created

Date:
July 26, 2012
Source:
University of Texas at Austin
Summary:
Physicists have developed the world's smallest semiconductor laser, a breakthrough for emerging photonic technology with applications from computing to medicine.

Physics graduate student Charlotte Sanders' research with professor Ken Shih helped develop the world's smallest nanolaser. She stands here with a molecular beam epitaxy machine that she designed and built in collaboration with the Department of Physics Machine Shop and with assistance from co-author Dr. Jisun Kim. The machine is used to create a smooth silver thin film critical to the function of the laser.
Credit: Alex Wang

Physicists at The University of Texas at Austin, in collaboration with colleagues in Taiwan and China, have developed the world's smallest semiconductor laser, a breakthrough for emerging photonic technology with applications from computing to medicine.

The scientists report their efforts in this week's Science.

Miniaturization of semiconductor lasers is key for the development of faster, smaller and lower energy photon-based technologies, such as ultrafast computer chips; highly sensitive biosensors for detecting, treating and studying disease; and next-generation communication technologies.

Such photonic devices could use nanolasers to generate optical signals and transmit information, and have the potential to replace electronic circuits. But the size and performance of photonic devices have been restricted by what's known as the three-dimensional optical diffraction limit.

"We have developed a nanolaser device that operates well below the 3-D diffraction limit," said Chih-Kang "Ken" Shih, professor of physics at The University of Texas at Austin. "We believe our research could have a large impact on nanoscale technologies."

In the current paper, Shih and his colleagues report the first operation of a continuous-wave, low-threshold laser below the 3-D diffraction limit. When fired, the nanolaser emits a green light. The laser is too small to be visible to the naked eye.

The device is constructed of a gallium nitride nanorod that is partially filled with indium gallium nitride. Both alloys are semiconductors used commonly in LEDs. The nanorod is placed on top of a thin insulating layer of silicon that in turn covers a layer of silver film that is smooth at the atomic level.

It's a material that the Shih lab has been perfecting for more than 15 years. That "atomic smoothness" is key to building photonic devices that don't scatter and lose plasmons, which are waves of electrons that can be used to move large amounts of data.

"Atomically smooth plasmonic structures are highly desirable building blocks for applications with low loss of data," said Shih.

Nanolasers such as this could provide for the development of chips where all processes are contained on the chip, so-called "on-chip" communication systems. This would prevent heat gains and information loss typically associated with electronic devices that pass data between multiple chips.

"Size mismatches between electronics and photonics have been a huge barrier to realize on-chip optical communications and computing systems," said Shangjr Gwo, professor at National Tsing Hua University in Taiwain and a former doctoral student of Shih's.


Story Source:

The above story is based on materials provided by University of Texas at Austin. Note: Materials may be edited for content and length.


Journal Reference:

  1. Y.-J. Lu, J. Kim, H.-Y. Chen, C. Wu, N. Dabidian, C. E. Sanders, C.-Y. Wang, M.-Y. Lu, B.-H. Li, X. Qiu, W.-H. Chang, L.-J. Chen, G. Shvets, C.-K. Shih, S. Gwo. Plasmonic Nanolaser Using Epitaxially Grown Silver Film. Science, 2012; 337 (6093): 450 DOI: 10.1126/science.1223504

Cite This Page:

University of Texas at Austin. "World's smallest semiconductor laser created." ScienceDaily. ScienceDaily, 26 July 2012. <www.sciencedaily.com/releases/2012/07/120726142158.htm>.
University of Texas at Austin. (2012, July 26). World's smallest semiconductor laser created. ScienceDaily. Retrieved April 16, 2014 from www.sciencedaily.com/releases/2012/07/120726142158.htm
University of Texas at Austin. "World's smallest semiconductor laser created." ScienceDaily. www.sciencedaily.com/releases/2012/07/120726142158.htm (accessed April 16, 2014).

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