3 years ago

MoS2 for Ultrafast All-Optical Switching and Modulation of THz Fano Metaphotonic Devices

MoS2 for Ultrafast All-Optical Switching and Modulation of THz Fano Metaphotonic Devices
Apoorva Chaturvedi, Manukumara Manjappa, Christian Kloc, Govind Dayal, Abhishek Kumar, Yogesh Kumar Srivastava, Ranjan Singh
In recent years, the stunning performance of transition metal dichalcogenides (TMDCs) has been utilized in the area of field effect transistors, integrated circuits, photodetectors, light generation and harvesting, valleytronics, and van der Waals (vdW) heterostructures. However, the optoelectronic application of TMDCs in realizing efficient, ultrafast metaphotonic devices in the terahertz part of the electromagnetic spectrum has remained unexplored. The most studied member of the TMDC family, i.e., MoS2, shows an ultrafast carrier relaxation after photoexcitation with near-infrared femtosecond pulse of energy above the bandgap. Here, this study investigates the photoactive properties of MoS2 to demonstrate an ultrasensitive active switching and modulation of the sharp Fano resonances in MoS2-coated metamaterials consisting of asymmetric split ring resonator arrays. The results show that all-optical switching and modulation of micrometer scale subwavelength Fano resonators can be achieved on a timescale of hundred picoseconds at moderate excitation pump fluences. The precise and active control of the MoS2-based hybrid metaphotonic devices open up opportunities for the real-world technologies and realization of ultrafast switchable sensors, modulators, filters, and nonlinear devices. Photoactive properties of MoS2 thin film enable low fluence modulation of Fano resonance in a hybrid MoS2-metamaterial device. The drop casting of MoS2 turns out to be a robust and facile method to integrate MoS2 with subwavelength photonic metadevices and manifest the ultrafast switching of Fano resonances at picosecond time scale.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adom.201700762

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