CUED Publications database

Hot electrons modulation of third harmonic generation in graphene

Soavi, G and Wang, G and Rostami, H and Tomadin, A and Balci, O and Paradisanos, I and Pogna, EAA and Cerullo, G and Lidorikis, E and Polini, M and Ferrari, AC (2019) Hot electrons modulation of third harmonic generation in graphene. In: UNSPECIFIED.

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© 2019 IEEE Hot-electrons dominate the ultrafast (∼fs-ps) optical and electronic properties of metals and semiconductors [1-2] and they are exploited in a variety of applications including photovoltaics and photodetection. Here we perform power-dependent third harmonic generation (THG) measurements on gated single layer graphene (SLG) and we show that hot-electrons modulate significantly the power-law dependence of THG, inducing a large deviation from the expected cubic power-law. We use a Chemical Vapor Deposition (CVD) SLG sample transferred on Fused Silica (FS) and gated by ionic liquid (IL), Fig.1(a). We excite the sample with the idler beam of an Optical Parametric Oscillator (OPO, Coherent) at a photon energy of ħω0=0.69eV. The OPO is seeded by a mode-locked Ti:Sa laser (Coherent) with 150fs pulse duration and 80MHz repetition rate. The OPO idler spot-size is∼4.7µm and the pulse duration ∼300fs.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Depositing User: Cron Job
Date Deposited: 22 May 2020 21:03
Last Modified: 24 Nov 2020 11:30