Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Illinois researchers produce two most important scientific papers

07.06.2006


Two of the five most important papers published in the 43-year history of the journal Applied Physics Letters were written by researchers at the University of Illinois at Urbana-Champaign.



Nick Holonyak Jr., a John Bardeen Chair Professor of Electrical and Computer Engineering and Physics at Illinois, was an author of both papers, which span the development of the light-emitting diode to the invention of the transistor laser.

As the American Institute of Physics celebrates its 75th anniversary this year, editors of the organization’s research journals were asked to select the five most significant papers published in each journal. In the case of Applied Physics Letters, thousands of papers were considered -- not only for scientific content, but also for the impact a paper had, or might have, on industry or the general public.


The first of Holonyak’s chosen papers appeared in the journal’s Dec. 1, 1962, issue and reported the first semiconductor laser in the visible spectrum and the first visible light-emitting diode, which formed the basis for today’s high brightness light-emitting diodes.

"This may be the most important piece of work I’ve ever done," said Holonyak, who was employed at the General Electric Co. in Syracuse, N.Y., at the time. Holonyak’s technician, Sam (Severio) Bevacqua, was the paper’s only co-author.

The second paper selected by the journal appeared in the Sept. 26, 2005, issue and reported the first room-temperature operation of a transistor laser. "I consider this a very important development and maybe -- time will tell -- a great development," Holonyak said.

In addition to Holonyak, the paper’s co-authors were electrical and computer engineering professor Milton Feng, and postdoctoral research associate Gabriel Walter and graduate research assistant Richard Chan (now at BAE Systems).

The Illinois researchers first reported the demonstration of a light-emitting, heterojunction bipolar transistor in the journal’s Jan. 5, 2004, issue. They described the first laser operation of the light-emitting transistor in the Nov. 15, 2004, issue, but at that time the transistor laser had to be chilled with liquid nitrogen to minus 73 degrees Celsius.

By demonstrating room-temperature operation, the researchers moved the transistor laser much closer to practical applications.

"Room-temperature transistor lasers could facilitate faster signal processing, large capacity seamless communications, and higher performance electrical and optical integrated circuits," said Feng, the Holonyak Chair Professor of Electrical and Computer Engineering at Illinois. Feng has received worldwide recognition for his research on heterojunction bipolar transistors. He has produced the world’s fastest bipolar transistor, a device that operates at a frequency of more than 700 gigahertz.

The transistor laser combines the functionality of both a transistor and a laser by converting electrical input signals into two output signals, one electrical and one optical.

"By incorporating quantum wells into the active region, we have enhanced the electrical and optical properties, making possible stimulated emission and transistor laser operation," said Holonyak, who also is a professor in the university’s Center for Advanced Study, one of the highest forms of campus recognition. "What we have here is a new form of transistor and a new form of laser."

The transistor laser also raises the possibility of replacing wiring between components at the chip- or board-level with optical interconnects, offering more flexibility and capability in true electronic-integrated circuits.

"Fifty-eight years after (John) Bardeen and (Walter) Brattain invented the transistor, we have hit upon something new that is surprisingly fundamental and rich in possibilities," Holonyak said. "I am happy to have had a hand in this."

James E. Kloeppel | EurekAlert!
Further information:
http://www.uiuc.edu

More articles from Physics and Astronomy:

nachricht Climate cycles may explain how running water carved Mars' surface features
02.12.2016 | Penn State

nachricht What do Netflix, Google and planetary systems have in common?
02.12.2016 | University of Toronto

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>