Details

Autor(en) / Beteiligte

• Gopalan, Prashanth
• Chanana, Ashish
• Krishnamoorthy, Sriram
• Nahata, Ajay
• Scarpulla, Michael
• Sensale-Rodriguez, Berardi

Titel

Ultrafast terahertz modulator based on metamaterial-integrated WSe2 thin-films

Ist Teil von

• 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2018, p.1-1

Ort / Verlag

IEEE

Erscheinungsjahr

2018

Quelle

IEEE Explore

Beschreibungen/Notizen

• Semiconducting TMDs are promising candidates for THz optoelectronic devices with their ultrafast carrier dynamics and large modulation depths stemming from high photo-induced carrier concentration. In this work, we exploit the ultrafast carrier recombination in photoexcited WSe2 thin films for active THz modulation. The THz absorption was modelled as a sum of a free carrier Drude term and a Lorentzian oscillator for excitonic bound carriers. Based on this, we explore a THz modulator based on a metamaterial structure capacitively coupled to a CVD grown WSe2 film. While the THz absorption upon photoexcitation is strong close to the exciton resonance, the modulation response is limited by free carriers.