Abstract
Optoelectronic devices in the UV range have many applications including deep-UV communications, UV photodetectors, UV spectroscopy, etc. Graphene has unique exciton resonances, that have demonstrated large photosensitivity across the UV spectrum. Enhancing UV absorption in graphene has the potential to boost the performance of the various opto-electronic devices. Here we report numerical study of UV absorption in graphene on aluminum and magnesium hole-arrays. The absorption in a single-layer graphene on aluminum and magnesium hole-arrays reached a maximum value of 28% and 30% respectively, and the absorption peak is tunable from the UV to the visible range. The proposed graphene hybrid structure does not require graphene to be sandwiched between different material layers and thus is easy to fabricate and allows graphene to interact with its surroundings.
Highlights
Optoelectronic devices in the UV range have many applications including deep-UV communications, UV photodetectors, UV spectroscopy, etc
Opto-electronic devices in the UV range can be used for deep-UV communications, UV photodetectors, UV spectroscopy, etc[12,13,14]
By tuning the periodicities of the hole-arrays, the graphene absorption peaks can be shifted towards the visible range
Summary
Optoelectronic devices in the UV range have many applications including deep-UV communications, UV photodetectors, UV spectroscopy, etc. Enhancing UV absorption in graphene has the potential to boost the performance of the various opto-electronic devices. The absorption in a single-layer graphene on aluminum and magnesium hole-arrays reached a maximum value of 28% and 30% respectively, and the absorption peak is tunable from the UV to the visible range. Metal-dielectric-metal plasmonic structures achieved numerically enhanced absorption of UV light in a single-layer graphene up to 50%23. Through FDTD simulations, we propose to use an aluminum and magnesium hole-array to enhance UV absorption in a single-layer graphene. These structures are easy to fabricate in practice; graphene can be transferred to the hole-arrays without additional deposition/ lithography steps. Magnesium hole-arrays achieved 28% and 30% absorption at 300 nm, respectively, and the absorption peak is tunable from the UV to the visible range
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