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Browse Journals & Magazines > Applied Physics Letters ...> Volume:99 Issue:13 Help

Terahertz heterodyne imaging with InGaAs-based bow-tie diodes

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9 Author(s)
Minkevicius, Linas ; Center for Physical Sciences and Technology, A. Goštauto str. 11, Vilnius LT-01108, Lithuania ; Tamosiunas, Vincas ; Kasalynas, Irmantas ; Seliuta, Dalius
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.3641907 

Room-temperature detection and imaging in transmission and reflection geometries at 0.591 THz with planar asymmetrically shaped InGaAs diodes (also called bow-tie diodes) are demonstrated in direct and heterodyne mode. The sensitivity of the diodes is found to be 6 V/W in direct mode, and the noise-equivalent power (NEP) in direct and heterodyne mode is estimated to be about

4 nW/
√ H
z
and 230 fW/Hz for a local-oscillator power of 11 μW, respectively. The improvement of the dynamic range by heterodyning over direct power detection amounts to about 20 dB using pixel read-out times relevant to real-time imaging conditions.

Published in:
Applied Physics Letters  (Volume:99 ,  Issue: 13 )

Date of Publication: Sep 2011

Page(s):
131101 - 131101-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.3641907
Product Type:
Journals & Magazines
Date of Current Version :
29 September 2011
Issue Date :
Sep 2011

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