Mona Jarrahi- New Frontiers in Terahertz Technology

Speaker: A/Prof Mona Jarrahi, University of California Los Angeles, CA, USA
Seminar Date: Tue, 28/07/2015 - 14:00
Venue: Advanced Engineering Building (Building 49), 49-502
Host: Konstanty Bialkowski

https://www.blogger.com/blogger.g?blogID=124073320791841682&pli=1#editor/target=post;postID=5778916195061277540

Although unique potentials of terahertz waves for chemical identification, material characterization, biological sensing, and medical imaging have been recognized for quite a while, the relatively poor performance, higher costs, and bulky nature of current terahertz systems continue to impede their deployment in field settings. In this talk, I will describe some of our recent results on developing fundamentally new terahertz electronic/optoelectronic components and imaging/spectrometry architectures to mitigate performance limitations of existing terahertz systems. In specific, I will introduce new designs of high-performance photoconductive terahertz sources that utilize plasmonic antennas to offer terahertz radiation at record-high power levels of several milliwatts – demonstrating more than three orders of magnitude increase compared to the state of the art. I will describe that the unique capabilities of these plasmonic antennas can be further extended to develop terahertz detectors and heterodyne spectrometers with single-photon detection sensitivities over a broad terahertz bandwidth at room temperatures, which has not been possible through existing technologies. To achieve this significant performance improvement, plasmonic antennas and device architectures are optimized for operation at telecommunication wavelengths, where very high power, narrow linewidth, wavelength tunable, compact and cost-effective optical sources are commercially available. Therefore, our results pave the way to compact and low-cost terahertz sources, detectors, and spectrometers that could offer numerous opportunities for e.g., medical imaging and diagnostics, atmospheric sensing, pharmaceutical quality control, and security screening systems. And finally, I will briefly highlight our research activities on development of new types of high-performance terahertz passive components (e.g., modulators, tunable filters, and beam deflectors) based on novel reconfigurable meta-films.

World-first laser boosts skin cancer detection

http://statements.qld.gov.au/Statement/2014/5/26/worldfirst-laser-boosts-skin-cancer-detection

World-first, cutting-edge laser technology being used by Queensland researchers will revolutionise the detection and treatment of skin cancer, saving lives and cutting treatment costs.

Science Minister Ian Walker said the laser imaging system, developed by researchers at the University of Queensland’s School of Information Technology and Electrical Engineering and the University of Leeds, would help deliver on the Government’s election promise to revitalise frontline health services.

“We live in the skin cancer capital of the world where one in two Queenslanders will develop skin cancers in their lifetime,” Mr Walker said.

“Early detection is crucial and this ground-breaking research, supported by the Queensland Government, will assist this.

“Scientists have built a prototype terahertz laser imaging system, the first of its kind in Australia.

“It has huge potential to revolutionise skin cancer treatment as it takes a more accurate picture of the skin and what is going on under the surface, reducing the need for invasive surgery.”

Mr Walker said the research was based on the terahertz region, a part of the electromagnetic spectrum that until recently had been almost impossible to work with.

“The fact that researchers have been able to master this region is a tremendous scientific achievement,” he said.

Lead researcher Dr Yah Leng Lim said current methods for detecting and diagnosing skin cancer were based on a visual examination by a GP and a biopsy.

“If cancer is detected, treatment usually involves the surgical removal of the lesions,” Dr Lim said.

“The problem is that the visual examination is not always perfect. Treatment options, such as surgery, can overestimate the tumour extent, leading to the removal of healthy as well as damaged tissue.

“With a medical imaging system based on a terahertz laser, you can get a more accurate picture of what’s going on beneath the skin surface. The other big advantage is that it is harmless to humans.”

Dr Lim has received $120,000 in Queensland Government funding, with a further $60,000 to be provided over the next year.