期刊
ACS NANO
卷 6, 期 10, 页码 9118-9124出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn303392s
关键词
tunable metamaterials; graphene; terahertz waves; wide-band terahertz wave modulation; broadband modulation; photodoping of graphene; enhanced modulation depth
类别
资金
- OPTIMAS Carl-Zeiss-Ph.D. program
- Consolider Nanolight [CSD2007-00046]
New applications in the realms of terahertz (THz) technology require versatile adaptive optics and powerful modulation techniques. Semiconductors have proven to provide fast all-optical terahertz wave modulation over a wide frequency band. We show that the attenuation and modulation depth in optically driven silicon modulators can be significantly enhanced by deposition of graphene on silicon (GOS). We observed a wide-band tunability of the THz transmission in a frequency range from 0.2 to 2 THz and a maximum modulation depth of 99%. The maximum difference between the transmission through silicon and GOS is Delta t = 0.18 at a low phor doping power of 40 mW. At higher modulation power, the enhancement decreased due to charge carrier saturation. We developed a semianalytical band structure model of the graphene silicon interface to describe the observed attenuation and modulation depth in GOS.
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