Speaker | Alessandra Di Gaspare |
Affiliation | NEST, NANO-CNR |
Date | 2020-04-16 |
Time | 11:00 |
Venue | ONLINE https://jitsi.cedrc.cnr.it/blsarhLGLGLGLG24666kjggggGGKHHG467618768 |
Host | Fabio Taddei and Stefan Heun |
Two-dimensional nano-materials and related heterostructures are establishing themselves as intriguing material systems for the development of a new class of electronic, photonic and plasmonic devices with ad hoc-properties, that can be engineered “from scratch”. Huge potential can be envisaged in a variety of application fields, ranging from saturable absorbers to high speed photodetectors, from optical communication modules to amplitude and phase reconfigurable modulators, capable to actively manipulate THz waves. Devices exploiting single layer graphene (SLG) have an enormous potential for two main reasons: (i) its THz optical conductivity can be adjusted easily through electrostatic gating, which is the key property of reconfigurable devices; (ii) high-quality large area SLG obtained via chemical vapor deposition on Cu can be easily employed to realize hybrid devices by transferring SLG films on properly engineered structures, such as a cavities or waveguides. In this seminar, I will report on the development of graphene-on-polyimide THz modulator with a tunable-by-design optical bandwidth with excellent modulation efficiency. The electrostatic tuning of the THz conductivity is achieved through a grating gate coupler on the top of the polyimide waveguide. By coupling the modulator with a THz quantum cascade laser frequency comb, we show comb operation over a dynamic range significantly larger than the bare laser, demonstrating the efficacy of our modulator in compensating the intracavity laser dispersion.
Fabio Taddei (9038) - fabio.taddei@nano.cnr.it
Stefan Heun (9472) - stefan.heun@nano.cnr.it
Istituto Nanoscienze
Consiglio Nazionale delle Ricerche
PEC: protocollo.nano@pec.cnr.it
Partita IVA 02118311006
Piazza San Silvestro 12
56127 Pisa, Italy
phone +39 050 509418
fax +39 050 509550
Istituto Nanoscienze Consiglio Nazionale delle Ricerche
Piazza San Silvestro 12, I
56127 Pisa
phone +39 050 509525/418
fax +39 050 509550
via Campi 213/A, I
41125 Modena 7
phone +39 059 2055629
fax +39 059 2055651″
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