A spectrally tunable plasmonic photosensor with an ultrathin semiconductor region

Abstract

Surface plasmon resonance (SPR) has been widely utilized to improve the absorption performance in the photosensors. Graphene has emerged as a promising plasmonic material, which supports tunable SPR and shows significant flexibility over metals. In this letter, a hybrid photosensor based on the integration of periodic cross-shaped graphene arrays with an ultrathin light-absorbing semiconductor is proposed. A tenfold absorption enhancement over a large range of the incidence angle for both light polarizations as well as a considerably high photogeneration rate ($\sim 10^{37}$) is demonstrated at the resonance. Compared with traditional metal-based plasmon-enhanced photosensors, the absorption enhancement here can be expediently tuned with manipulating the Fermi energy of graphene. The proposed photosensor can amplify the photoresponse to the incidence light at the selected wavelength and thus be utilized in photosensing with high efficiency and tunable spectral selectivity in the mid-infrared (mid-IR) and terahertz (THz) regime.

Accepted Manuscript

References in corpus (5)

• Graphene plasmonics
• Graphene Plasmonics: Challenges and Opportunities
• Tunable light trapping and absorption enhancement with graphene ring arrays
• Strong interaction between graphene layer and Fano resonance in terahertz metamaterials
• Experimental demonstration of graphene plasmons working close to the near-infrared window

Cited by in corpus (4)

• Independently tunable dual-spectral electromagnetically induced transparency in a terahertz metal-graphene metamaterial
• Plasmonic absorption characteristics based on dumbbell-shaped graphene metamaterial arrays
• Approaching perfect absorption of monolayer molybdenum disulfide at visible wavelengths using critical coupling
• Tunable light trapping and absorption enhancement with graphene-based complementary metamaterials