Journal
NANO LETTERS
Volume 15, Issue 3, Pages 1591-1596Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl504116w
Keywords
Graphene; on-chip; THz detection; GaAs; Goubau line; photoconductive switch
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Funding
- EPSRC
- ERC grant NOTES
- ERC grant TOSCA
- National Physical Laboratory
- Royal Society
- Wolfson Foundation
- EPSRC [EP/H007881/1, EP/F029543/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1089600, EP/F029543/1, EP/H007881/1] Funding Source: researchfish
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We report on the use of graphene for room temperature on-chip detection and generation of pulsed terahertz (THz) frequency radiation, exploiting the fast carrier dynamics of light-generated hot carriers, and compare our results with conventional low-temperature-grown gallium arsenide (LT-GaAs) photoconductive (PC) switches. Coupling of picosecond-duration pulses from a biased graphene PC switch into Goubau line waveguides is also demonstrated. A Drude transport model based on the transient photoconductance of graphene is used to describe the mechanism for both detection and generation of THz radiation.
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