Stantchev, R. I., Sun, B., Hornett, S. M., Hobson, P. A., Gibson, G. M. , Padgett, M. J. and Hendry, E. (2016) Noninvasive, near-field terahertz imaging of hidden objects using a single-pixel detector. Science Advances, 2(6), e1600190. (doi: 10.1126/sciadv.1600190)
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Abstract
Terahertz (THz) imaging can see through otherwise opaque materials. However, because of the long wavelengths of THz radiation (λ = 400 μm at 0.75 THz), far-field THz imaging techniques suffer from low resolution compared to visible wavelengths. We demonstrate noninvasive, near-field THz imaging with subwavelength resolution. We project a time-varying, intense (>100 μJ/cm2) optical pattern onto a silicon wafer, which spatially modulates the transmission of synchronous pulse of THz radiation. An unknown object is placed on the hidden side of the silicon, and the far-field THz transmission corresponding to each mask is recorded by a single-element detector. Knowledge of the patterns and of the corresponding detector signal are combined to give an image of the object. Using this technique, we image a printed circuit board on the underside of a 115-μm-thick silicon wafer with ~100-μm (λ/4) resolution. With subwavelength resolution and the inherent sensitivity to local conductivity, it is possible to detect fissures in the circuitry wiring of a few micrometers in size. THz imaging systems of this type will have other uses too, where noninvasive measurement or imaging of concealed structures is necessary, such as in semiconductor manufacturing or in ex vivo bioimaging.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Gibson, Dr Graham and Sun, Mr Baoqing and Padgett, Professor Miles |
| Authors: | Stantchev, R. I., Sun, B., Hornett, S. M., Hobson, P. A., Gibson, G. M., Padgett, M. J., and Hendry, E. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Science Advances |
| Publisher: | American Association for the Advancement of Science |
| ISSN: | 2375-2548 |
| Copyright Holders: | Copyright © 2016 The Authors |
| First Published: | First published in Science Advances 2(6):e1600190 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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