Photo-induced terahertz near-field dynamics of graphene/InAs heterostructures

In this letter, we report optical pump terahertz (THz) near-field probe (n-OPTP) and optical pump THz near-field emission (n-OPTE) experiments of graphene/InAs heterostructures. Near-field imaging contrasts between graphene and InAs using these newly developed techniques as well as spectrally integr...

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Veröffentlicht in:Optics express 2019-05, Vol.27 (10), p.13611-13623
Hauptverfasser: Yao, Ziheng, Semenenko, Vyacheslav, Zhang, Jiawei, Mills, Scott, Zhao, Xiaoguang, Chen, Xinzhong, Hu, Hai, Mescall, Ryan, Ciavatti, Thomas, March, Stephen, Bank, Seth R, Tao, Tiger H, Zhang, Xin, Perebeinos, Vasili, Dai, Qing, Du, Xu, Liu, Mengkun
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Sprache:eng
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Zusammenfassung:In this letter, we report optical pump terahertz (THz) near-field probe (n-OPTP) and optical pump THz near-field emission (n-OPTE) experiments of graphene/InAs heterostructures. Near-field imaging contrasts between graphene and InAs using these newly developed techniques as well as spectrally integrated THz nano-imaging (THz s-SNOM) are systematically studied. We demonstrate that in the near-field regime (λ/6000), a single layer of graphene is transparent to near-IR (800 nm) optical excitation and completely "screens" the photo-induced far-infrared (THz) dynamics in its substrate (InAs). Our work reveals unique frequency-selective ultrafast dynamics probed at the near field. It also provides strong evidence that n-OPTE nanoscopy yields contrast that distinguishes single-layer graphene from its substrate.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.013611