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Tunable terahertz frequency comb generation using time-dependent graphene sheets

Vincent Ginis ; Philippe Tassin (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Thomas Koschny ; Costas M. Soukoulis
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 91 (2015), p. 161403(R).
[Artikel, refereegranskad vetenskaplig]

We investigate the interaction between electromagnetic pulses and two-dimensional current sheets whose conductivity is controlled as a function of time by the generation of photocarriers, and we discuss its applicability to tunable frequency comb generation. To this aim, we develop an analytical model that permits the calculation of the scattered waves off a thin sheet with time-dependent, dispersive sheet conductivity. We evaluate the transmitted spectrum as a function of the dispersive behavior and the modulation frequency of the number of photocarriers. We conclude that such active materials, e.g., time-dependent graphene sheets, open up the possibility to manipulate the frequency of incident pulses and, hence, could lead to highly tunable, miniaturized frequency comb generation.

Nyckelord: graphene, frequency combs, tunable metamaterials



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Denna post skapades 2015-04-08. Senast ändrad 2015-06-24.
CPL Pubid: 214977

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)

Ämnesområden

Nanovetenskap och nanoteknik
Optisk fysik
Ytor och mellanytor
Övrig elektroteknik, elektronik och fotonik

Chalmers infrastruktur