Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4973816
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Funding
- National Instrumentation Program [2012YQ140005]
- National Natural Science Foundation of China [61505125]
- Nature Science Foundation of Beijing [4144069]
- Science and Technology Project of Beijing Municipal Education Commission [KM201410028004]
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We investigate a high-efficiency broadband terahertz wave modulator with structures made from the conjugated polymer [2-methoxy-5-(2'-ethylhexyloxy)-1, 4-phenylennevinylene], graphene, and Si, irradiated with an external excitation laser. We demonstrate a strategy that can alleviate the tradeoff between the requirements of modulation depth and modulation speed in polymer/silicon terahertz wave modulators. Using terahertz time-domain and continuous-wave systems, we measured both the terahertz transmission modulation properties and the time responses of the modulator structures. The conjugated polymer/graphene/silicon structure achieved a high modulation factor of 93% for transmission as well as improved the modulation speed of the devices based on polymer/silicon. The high modulation efficiency of the polymer/graphene/silicon structure was induced by the enhancement in carrier density and the extremely high carrier mobility of graphene, respectively. Published by AIP Publishing.
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