Improved performance of GaAs-based terahertz emitters via surface passivation and silicon nitride encapsulation
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Headley, Carl; Fu, Lan; Parkinson, Patrick Wallace; Xu, Xinlong L; Lloyd-Hughes, J; Jagadish, Chennupati; Johnston, Michael B
Description
We have improved the stability and performance of terahertz (THz) photoconductive (Auston) switches using a combination of (NH4) 2S surface passivation (SP) and silicon nitride (Si3 N4) encapsulation. The influences of SP and encapsulation on the ultrafast electron dynamics in GaAs were examined using THz emission spectroscopy and optical pumpTHz probe spectroscopy. The power of THz radiation from the surface of photoexcited GaAs increased by a factor of 5 after passivation and encapsulation,...[Show more]
dc.contributor.author | Headley, Carl | |
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dc.contributor.author | Fu, Lan | |
dc.contributor.author | Parkinson, Patrick Wallace | |
dc.contributor.author | Xu, Xinlong L | |
dc.contributor.author | Lloyd-Hughes, J | |
dc.contributor.author | Jagadish, Chennupati | |
dc.contributor.author | Johnston, Michael B | |
dc.date.accessioned | 2015-12-10T23:22:50Z | |
dc.identifier.issn | 1077-260X | |
dc.identifier.uri | http://hdl.handle.net/1885/66686 | |
dc.description.abstract | We have improved the stability and performance of terahertz (THz) photoconductive (Auston) switches using a combination of (NH4) 2S surface passivation (SP) and silicon nitride (Si3 N4) encapsulation. The influences of SP and encapsulation on the ultrafast electron dynamics in GaAs were examined using THz emission spectroscopy and optical pumpTHz probe spectroscopy. The power of THz radiation from the surface of photoexcited GaAs increased by a factor of 5 after passivation and encapsulation, while the process lengthened the trapping time for photoexcited charge carriers. By fabricating and assessing the performance of photoconductive switches, we found that passivation and encapsulation increased the average THz power generated fourfold. | |
dc.publisher | Institute of Electrical and Electronics Engineers (IEEE Inc) | |
dc.source | IEEE Journal on Selected Topics in Quantum Electronics | |
dc.subject | Keywords: GaAs; Photoconductive switches; Probe spectroscopy; Surface passivation; surface passivation (SP); Terahertz; Terahertz emitters; THz radiation; time-domain spectroscopy; Trapping time; Ultrafast electron dynamics; Emission spectroscopy; Gallium alloys; G Photoconductive switch (PCS); surface passivation (SP); terahertz (THz); time-domain spectroscopy | |
dc.title | Improved performance of GaAs-based terahertz emitters via surface passivation and silicon nitride encapsulation | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 17 | |
dc.date.issued | 2011 | |
local.identifier.absfor | 020499 - Condensed Matter Physics not elsewhere classified | |
local.identifier.ariespublication | f2965xPUB1326 | |
local.identifier.ariespublication | U3488905xPUB248 | |
local.type.status | Published Version | |
local.contributor.affiliation | Headley, Carl, University of Oxford | |
local.contributor.affiliation | Fu, Lan, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Parkinson, Patrick Wallace, University of Oxford | |
local.contributor.affiliation | Xu, Xinlong L, University of Oxford | |
local.contributor.affiliation | Lloyd-Hughes, J, University of Oxford | |
local.contributor.affiliation | Jagadish, Chennupati, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Johnston, Michael B, University of Oxford | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 1 | |
local.bibliographicCitation.startpage | 17 | |
local.bibliographicCitation.lastpage | 21 | |
local.identifier.doi | 10.1109/JSTQE.2010.2047006 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
local.identifier.absseo | 970109 - Expanding Knowledge in Engineering | |
dc.date.updated | 2016-02-24T08:12:38Z | |
local.identifier.scopusID | 2-s2.0-79951553271 | |
local.identifier.thomsonID | 000287086100003 | |
Collections | ANU Research Publications |
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