{"id":944,"date":"2012-05-18T18:42:13","date_gmt":"2012-05-18T16:42:13","guid":{"rendered":"https:\/\/www.iemn.fr\/?page_id=944"},"modified":"2012-05-18T18:42:13","modified_gmt":"2012-05-18T16:42:13","slug":"thz-characterization","status":"publish","type":"page","link":"https:\/\/www.iemn.fr\/en\/thz-characterization","title":{"rendered":"THz characterization"},"content":{"rendered":"<h1>THz characterization<\/h1>\n<p>Sub-millimeter activities: THz waves generation<\/p>\n<p>Since 1999, some THz characterization activities has been developed. First a time-domain technique has been investigated and is based on an electro-optic sampling using a femto-second laser source. THz electric pulses are created by photo-conductive devices fabricated with very low carrier life times (sub-ps), for example the low temperature grown GaAs. Rise time of the electrical pulses is typically 500 fs, corresponding to a frequency range from 100 GHz to 2 THz. After that, electrical pulses are detected with an electro-absorbing technique developed at IEMN.<\/p>\n<p>A second activity on continuous-wave THz (CW-THz) signal generation has been investigated since 2002. This generation is realised by the photoresponse of semiconductors, and the optical source is composed of two CW lasers. Two approaches are studied: photo-conductive structures based on semiconductors with very short carrier lifetime, for example low-temperature grown GaAs (LT-GaAs), and ultra wideband photodetectors (Unitravelling Carrier Photodiodes). These two types of devices are solutions to CW-THz generation, the frequency of the generated signal is then controlled by the optical frequencies of the lasers.<\/p>\n<p>Applications of pulsed THz waves and CW-THz can be the test of high frequency electronic components (up to the sub-millimeter bands), imaging, ...<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2012\/05\/3foto_thz_v1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-603\" title=\"Caract\u00e9risation THz\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2012\/05\/3foto_thz_v1-300x216.jpg\" alt=\"Caract\u00e9risation THz\" width=\"300\" height=\"216\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>THz characterization Sub-millimeter activities\u00a0: THz waves generation Since 1999, some THz characterization activities has been developed. First a time-domain technique has been investigated and is based on an electro-optic sampling using a femto-second laser source. THz electric pulses are created by photo-conductive devices fabricated with very low carrier life times (sub-ps), for example the low [&hellip;]<\/p>","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-944","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/944","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=944"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/944\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}