Navigation Links
Researchers realize high-power, narrowband terahertz source at room temperature

Researchers at Northwestern University have developed a simpler way to generate single-chip terahertz radiation, a discovery that could soon allow for more rapid security screening, border protection, high sensitivity biological/chemical analysis, agricultural inspection, and astronomical applications.

The work, headed by Manijeh Razeghi, Walter P. Murphy Professor of Electrical Engineering and Computer Science in the McCormick School of Engineering and Applied Science, was published Sept. 26 in the journal Applied Physics Letters and was presented in August at the SPIE Optics + Photonics conference in San Diego.

Terahertz radiation (wavelength range of 30 300 microns) can be used to see through paper, clothing, cardboard, plastic, and many other materials, without any of the health risks posed by current x-ray based techniques. This property has become extremely valuable for security screening, as it is safe to use on people and can detect metals and ceramics that might be used as weapons.

In addition, a scanning terahertz source can identify many types of biological or chemical compounds due to their characteristic absorption spectra in this wavelength range. Sensitivity to water content can also be utilized to study agricultural quality. Finally, through mixing with a compact coherent terahertz source, very weak terahertz signals from deep space can be detected, which may help scientists understand the formation of the universe.

Coherent terahertz radiation has historically been very difficult to generate, and the search for an easy-to-use, compact source continues today. Current terahertz sources are large, multi-component systems that may require complex vacuum electronics, external pump lasers, and/or cryogenic cooling. A single component solution without any of these limitations is highly desirable to enable next generation terahertz systems.

One possible avenue toward this goal is to create and mix two mid-infrared laser beams within a single semiconductor chip in the presence of a giant nonlinearity. This nonlinearity allows for new terahertz photons to be created within the same chip with an energy equal to the difference of the mid-infrared lasers' energies. As mid-infrared lasers based on quantum cascade laser technology are operable at room temperature, the terahertz emission can also be demonstrated at room temperature.

Razeghi and her group at the Center for Quantum Devices have taken this basic approach a step further by addressing two key issues that have limited the usefulness of initial demonstrations. Razeghi's group currently leads the world in high-power quantum cascade laser technology; by increasing the power and beam quality of the mid-infrared pumps, the terahertz power has been significantly increased by more than a factor of 30 to ~10 microwatts.

Additionally, the researchers have incorporated a novel dual-wavelength diffraction grating within the laser cavity to create single mode (narrow spectrum) mid-infrared sources, which in turn has led to very narrow linewidth terahertz emission near 4 terahertz. Further, due to the novel generation mechanism, the terahertz spectrum is extremely stable with respect to current and/or temperature. This could make it valuable as a local oscillator, which can be used for low light level receivers like those needed for astronomical applications.

Razeghi said her group will continue in hopes of reaching higher power levels.

"Our goal is to reach milliwatt power levels and incorporate tuning within the device," Razeghi said. "Theory says that it is possible, and we have all of the tools necessary to realize this potential."


Contact: Megan Fellman
Northwestern University

Related biology news :

1. Researchers: Apply public trust doctrine to rescue wildlife from politics
2. Dead Sea researchers discover freshwater springs and numerous micro-organisms
3. Eating balanced meals, farm-fresh produce benefits families, communities, nutrition researchers say
4. LSU researchers find impact of oil spill in marsh fish species
5. MU researchers find new insight into fatal spinal disease
6. UCLA Engineering researchers help develop complete map of mouse genetic variation
7. Researchers develop optimal algorithm for determining focus error in eyes and cameras
8. Researchers at Cruces Hospital describe new syndrome of slight family intellectual disability
9. UCLA researchers develop system that finds prostate cancer spread earlier than conventional imaging
10. Joslin researchers identify pathways leading to activation of good fat
11. Kansas researchers find enriched infant formulas benefit brain and heart
Post Your Comments:
(Date:11/20/2015)... 20, 2015 NXTD ) ("NXT-ID" ... the growing mobile commerce market and creator of the ... , was recently interviewed on The RedChip Money ... this weekend on Bloomberg Europe , Bloomberg Asia, ... --> NXTD ) ("NXT-ID" or the "Company"), a ...
(Date:11/19/2015)... , Nov. 19, 2015  Based on its in-depth ... Sullivan recognizes BIO-key with the 2015 Global Frost & ... Frost & Sullivan presents this award to the company ... to the needs of the market it serves. The ... meets and expands on customer base demands, the overall ...
(Date:11/19/2015)... NEW YORK , Nov. 19, 2015  Although ... the market is dominated by a few companies, according ... Qiagen. These companies own 51% of the market share of ... report, The World Market for Molecular Diagnostic ... "The market is still controlled by one ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... ... November 24, 2015 , ... International Society for Pharmaceutical Engineering ... premier annual events for pharmaceutical manufacturing: 2015 Annual Meeting. The conference took place ... the largest number of attendees in more than a decade. , “The ...
(Date:11/24/2015)... November 24, 2015 --> ... research report "Oligonucleotide Synthesis Market by Product & Services ... Synthesis, Diagnostic, DNA, RNAi), End-User (Research, Pharmaceutical & Biotech, ... MarketsandMarkets, the market is expected to reach USD 1,918.6 ... at a CAGR of 10.1% during the forecast period. ...
(Date:11/24/2015)... SHPG ) announced today that Jeff ... 27 th Annual Healthcare Conference in New York ... a.m. EST (1:30 p.m. GMT). --> SHPG ) announced ... in the Piper Jaffray 27 th Annual Healthcare Conference in ... 1, 2015, at 8:30 a.m. EST (1:30 p.m. GMT). --> ...
(Date:11/24/2015)... CITY , Nov. 24, 2015 /PRNewswire/ - ... "Company") announced today that the remaining 11,000 post-share ... Share Purchase Warrants (the "Series B Warrants") subject ... were exercised on November 23, 2015, which will ... Shares.  After giving effect to the issuance of ...
Breaking Biology Technology: