Terahertz Imaging Goes the Distance



FOR IMMEDIATE RELEASE

Contact:
Lyndsay Meyer
CLEO/QELS
+1.202.416.1435
lmeyer@osa.org

TERAHERTZ IMAGING GOES THE DISTANCE

NEWS FROM THE CONFERENCE ON LASERS AND ELECTRO-OPTICS/QUANTUM ELECTRONICS LASER SCIENCE CONFERENCE (CLEO/QELS)


At the upcoming CLEO/QELS meeting in Baltimore, an MIT-Sandia team will demonstrate the first real-time THz imaging system that obtains images from 25 meters away. The technique takes advantage of the fact that there are a few "windows," or frequency ranges, of the terahertz spectrum that water does not absorb very strongly. The MIT-Sandia group designed a special, semiconductor-based device known as a "quantum cascade laser" that delivers light in one of these windows (specifically, around 4.9 THz). They shine this light through a thin target with low water content (for example, a dried seed pod), and a detector on the other side of the sample records an image. BALTIMORE, April 26 --  Terahertz (THz) radiation, or far-infrared light, is potentially very useful for security applications, as it can penetrate clothing and other materials to provide images of concealed weapons, drugs, or other objects. However, THz scanners must usually be very close to the objects they are imaging. Doubts have lingered over whether it is possible to use THz waves to image objects that are far away, because water vapor in air absorbs THz radiation so strongly that most of it never reaches the object to be imaged.


A cryorefrigerator maintains the laser at a temperature of 30 Kelvin, where it produces 17 milliwatts of power (as opposed to the microwatts of power typical of pulsed terahertz sources) in order to provide enough terahertz radiation to obtain a decent image. Increasing the power of the lasers and sensitivity of the detectors can potentially enable imaging of thicker objects or imaging of the reflected light, which would be more practical for security applications. In addition, the development of high-operating-temperature quantum cascade lasers, which operate without the use of cryogenic materials, may also increase the availability of this approach. In the closer term, however, this approach may enable sensing of chemical residues or contaminants in the air. 

Meeting Paper: CThU3, "Real Time, Transmission-Mode Terahertz Imaging Over a 25-Meter Distance," Lee et al., Thursday, May 10, 3:45 p.m. – 4 p.m.

About CLEO/QELS

With a distinguished history as one of the industry's leading events on laser science, the Conference on Lasers and Electro-Optics and the Quantum Electronics and Laser Science Conference (CLEO/QELS) is where laser technology was first introduced.  CLEO/QELS combines the strength of peer-reviewed scientific programming with an applications-focused exhibition to showcase the present and future of this technology.  Sponsored by the American Physical Society's (APS) Laser Science Division, the Institute of Electronic Engineers/Laser and Electro-Optics Society (IEEE/LEOS) and the Optical Society of America (OSA), CLEO/QELS provides an educational forum, complete with a dynamic Plenary, short courses, tutorials, workshops and more, on topics as diverse as its attendee base whose broad spectrum of interests range from biomedicine to defense to optical communications and beyond.  For more information, visit the conference's Web site at www.cleoconference.org.

# # #

 

Share:
Keyword
Topics

Optics Leaders Announced as Visionary Speakers for 2017 FIO + LS Meeting

The Frontiers in Optics + Laser Science APS/DLS (FIO + LS) conference and exhibition provides a venue for leaders in the optics and photonics community to discuss the latest advances in the field. In 2017, the FIO + LS meeting has been thoughtfully redesigned and revised, offering attendees the best of past meetings while adding innovative elements to this year’s meeting. A new speaker category of visionary speakers have been added and will deliver presentations around the four conference themes

Added: 20 Jul 2017


Researchers Look Inside Dangerous Blood Clots with Optical Clearing Technique

A new technique that makes blood clots optically clear is allowing researchers to use powerful optical microscopy techniques to study the 3D structure of dangerous clots for the first time. Although blood clots stop bleeding after injury, clots that block blood flow can cause strokes and heart attacks.

Added: 17 Jul 2017


New Imaging Technique Fast Enough to Watch Molecular Dynamics Involved in Neurodegenerative Diseases

Researchers have developed a fast and practical molecular-scale imaging technique that could let scientists view never-before-seen dynamics of biological processes involved in neurodegenerative diseases such as Alzheimer’s disease and multiple sclerosis.

Added: 13 Jul 2017


OSA Members Host Photonics Facility Tour for Congressman Charlie Dent

During the recent District Work Week, Representative Charlie Dent (R - Pa) toured the Center for Photonics and Nanoelectronics (CPN) and the Smith Family Laboratory for Optical Technologies, Lehigh University, PA. The tour was arranged by OSA members Nelson Tansu, the Daniel E. ’39 and Patricia M. Smith Endowed Chair Professor and Director of the CPN and Sean Anderson, a Photonics Engineer at Cisco.

Added: 12 Jul 2017


OSA’s Optics & Photonics News Wins 2017 APEX Award

OSA Publishing is pleased to announce that the staff of Optics & Photonics News (OPN), The Optical Society’s news and member magazine, has received a 2017 APEX Grand Award for publication excellence. The award honors a series of four commemorative booklets that the OPN team developed to highlight 100 years of The Optical Society.

Added: 11 Jul 2017


The Optical Society Announces 2017 OSA Optical Design & ​Fabrication Congress Highlights

Optical design and fabrication play an ever-increasing role in our modern society as more applications for optics are developed, especially in the areas of imaging, sensing and illumination systems. Advances in optical design and fabrication have led to the ability to utilize modern design tools to reduce cost, augment manufacturability, and enhance system performance in a wide variety applications.

Added: 05 Jul 2017


LASER World of Photonics 2017 Closes in Munich with a Record Number of Exhibitors and Attendees

WASHINGTON — The LASER World of Photonics Congress, a conference and exhibition co-sponsored by The Optical Society (OSA), attracted a record number of exhibitors and attendees over a four day period in Munich, Germany. The meeting was held in conjunction with CLEO/Europe – EQEC 2017 and the European Conferences on Biomedical Optics (ECBO 2017) from 25-29, June 2017.

Added: 03 Jul 2017


OSA Imaging & Applied Optics Congress Focuses on Breakthrough Imaging Innovations

The 2017 OSA Imaging and Applied Optics Congress (AIO/IS) concluded in San Francisco, California with nearly 350 attendees and more than 250 presentations from covering the diverse optical imaging industry. Research highlights included novel imaging optical imaging industry, innovative and collaborative applications and the future of imaging, as well as topical symposia highlighting advancements in 3D Image Acquisition and Display: Technology, Perception and Applications, Applied Industrial Optics, Computational Optical Sensing and Imaging, Imaging Systems and Applications, Mathematics in Imaging, Propagation Through and Characterization of Atmospheric and Oceanic Phenomena.

Added: 30 Jun 2017


Seeing the Forest Through the Trees with a New LiDAR System

Shortly after lasers were first developed in the 1960s, LiDAR – whose name originated as a combination of “light” and “radar” – capitalized on the newly unique precision they offered for measuring both time and distance. LiDAR quickly became the standard method for (3-D) land surveys and is now used in a multitude of sensing applications, such as self-driving cars.

Added: 27 Jun 2017


Moisture-Responsive ‘Robots’ Crawl with No External Power Source

Using an off-the-shelf camera flash, researchers turned an ordinary sheet of graphene oxide into a material that bends when exposed to moisture. They then used this material to make a spider-like crawler and claw robot that move in response to changing humidity without the need for any external power.

Added: 26 Jun 2017


OSA to Host an Incubator Meeting on Materials for Optomechanical Actuation

Incubator meeting to provide a collaborative forum for problem-solving optomechanical materials challenges.

Added: 25 Jun 2017


New Screen Coating Makes Reading in Sunlight a Lot Easier. The Secret? Moth Eyes.

Screens on even the newest phones and tablets can be hard to read outside in bright sunlight. Inspired by the nanostructures found on moth eyes, researchers have developed a new antireflection film that could keep people from having to run to the shade to look at their mobile devices.

Added: 22 Jun 2017