Info
Info
News Article

Researchers Create Compact Room Temperature THz Source

Quantum cascade laser-based source has a tuning range of 2.6 to 4.2THz

Devices using terahertz waves can detect explosives, chemical agents, and dangerous biological substances from safe distances. In astronomical research, atomic and molecular emission lines in the THz range are key diagnostic probes of the interstellar medium.  But current terahertz sources are large, multi-component systems that sometimes require complex vacuum systems, external pump lasers, and even cryogenic cooling. 

"A single-component solution capable of room temperature and widely tunable operation is highly desirable to enable next generation terahertz systems," said Manijeh Razeghi, director of Northwestern's University's Centre for Quantum Devices who, with her team, has been working to develop such a device.

In a recent paper in Applied Physics Letters, they demonstrate a room temperature, highly tunable, high power terahertz source. The monolithic design (pcitured above) is based on three-section Sampled Grating Distributed Feedback - Distributed Bragg Reflector (SGDFB-DBR) design in a mid-infrared quantum cascade laser . Sampled grating design has been widely applied to the semiconductor lasers at telecom wavelengths to extend their monolithic tuning range.

Based on nonlinear mixing in quantum cascade lasers, the group's THz source can emit up to 1.9 milliwatts of power and has a frequency coverage of 1 to 4.6THz. By designing a multi-section, sampled-grating distribution feedback and distributed Bragg reflector waveguide, Razeghi and her team were also able to give the device a tuning range of 2.6 to 4.2THz at room temperature.

"I am very excited about these results," Razeghi said. "No one would believe any of this was possible, even a couple years ago."

'Widely tunable room temperature semiconductor terahertz source' by Q Y Lu et al is published in Applied Physics Letters 105, 201102 (2014); http://dx.doi.org/10.1063/1.4902245



AngelTech Live III: Join us on 12 April 2021!

AngelTech Live III will be broadcast on 12 April 2021, 10am BST, rebroadcast on 14 April (10am CTT) and 16 April (10am PST) and will feature online versions of the market-leading physical events: CS International and PIC International PLUS a brand new Silicon Semiconductor International Track!

Thanks to the great diversity of the semiconductor industry, we are always chasing new markets and developing a range of exciting technologies.

2021 is no different. Over the last few months interest in deep-UV LEDs has rocketed, due to its capability to disinfect and sanitise areas and combat Covid-19. We shall consider a roadmap for this device, along with technologies for boosting its output.

We shall also look at microLEDs, a display with many wonderful attributes, identifying processes for handling the mass transfer of tiny emitters that hold the key to commercialisation of this technology.

We shall also discuss electrification of transportation, underpinned by wide bandgap power electronics and supported by blue lasers that are ideal for processing copper.

Additional areas we will cover include the development of GaN ICs, to improve the reach of power electronics; the great strides that have been made with gallium oxide; and a look at new materials, such as cubic GaN and AlScN.

Having attracted 1500 delegates over the last 2 online summits, the 3rd event promises to be even bigger and better – with 3 interactive sessions over 1 day and will once again prove to be a key event across the semiconductor and photonic integrated circuits calendar.

So make sure you sign up today and discover the latest cutting edge developments across the compound semiconductor and integrated photonics value chain.

REGISTER FOR FREE

VIEW SESSIONS

Info
×
Search the news archive

To close this popup you can press escape or click the close icon.
×
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in:
 
X
Info
X
Info
{taasPodcastNotification}
Live Event