skip to primary navigationskip to content
 

Imaging with terahertz radiation

Terahertz is an emerging research area that has flourished rapidly over the last decade. The field has drawn together experts of various disciplines including optics, optoelectronics, semiconductor physics, electronic engineering and chemistry. Terahertz radiation possesses a number of properties that makes it a promising radiation source for spectroscopy and imaging. For example, terahertz radiation is non-ionising and highly sensitive to water content. To date, there have been many attempts to build imaging systems using terahertz radiation for a wide range of potential applications including security screening and non-invasive testing of opaque objects. However, the majority of these systems encountered problems with the low power of terahertz source and as a result were only able to produce two-dimensional images of thin samples.

Figure 1
Figure 1: Polystyrene phantom in the shape a clown's head a) Front view, b) Top view, c) A hole with diameter of 10 mm was introduced into the sample invisible from the outside

Figure 2
Figure 2: Some views of the reconstructed 3D image a) The hole inside the phantom is revealed, b) The shape of the phantom is reconstructed, c) The top view shows the features of the nose and cheeks.

Further information:

In this project, we have constructed a novel three-dimensional imaging system that uses a terahertz quantum cascade laser. Terahertz quantum cascade laser was experimentally realised for the first time in 2002, providing a new powerful source to generate terahertz radiation. The imaging system used an experimental protocol and reconstruction algorithm similar to X-ray computed tomography. We have successfully obtained three-dimensional images of a variety of samples, revealing both the external features and especially internal structures that are invisible from the outside.

Three-dimensional imaging with a terahertz quantum cascade laser
K. Lien Nguyen, Michael L. Johns, Lynn F. Gladden, Christopher H. Worrall, Paul Alexander, Harvey E. Beere, Michael Pepper, David A. Ritchie, Jesse Alton and Stefano Barbieri, University of Cambridge, Edmund H. Linfield, University of Leeds
Optics Express Vol. 14, Issue 6 pp2123-2129, 2006

RSS Feed Latest news

SPARC success for CEB-India research collaboration

Feb 18, 2019

Scheme for Promotion of Academic and Research Collaboration (SPARC) grant awarded to CEB- Indian Institute of Technology Roorkee resrach collaboration.

Ineos Oxide Summer Intern Scheme launched at CEB

Feb 08, 2019

Ineos Oxide is looking for talented undergrad chemical engineering students to join their summer intern scheme and help them solve real-world problems.

New EPSRC Sensors CDT

Feb 05, 2019

New EPSRC Centre for Doctoral Training in Sensor Technologies and Applications for a Healthy and Sustainable Future at CEB.

View all news

Upcoming events

Celebrating LGBT and History Month

Feb 01, 2019

University-wide

Science Festival at CEB

Mar 23, 2019

CEB, Phillippa Fawcett Drive

Stokes200 Symposium

Sep 15, 2019

Pembroke College, Cambridge

VPF8 Viscoplastic Fluids: from Theory to Application 2019

Sep 16, 2019

Jesus College, Cambridge

Upcoming events