title: Nanoantenna coupled UV subwavelength photodetectors based on GaN.
abstract: The integration of nano structures with opto-electronic devices has many potential applications. It allows the coupling of more light into or out of the device while decreasing the size of the device itself. Such devices are reported in the VIS and NIR regions. However, making plasmonic structures for the UV region is still a challenge. Here, we report on a UV nano-antenna integrated metal semiconductor metal (MSM) photodetector based on GaN. We designed and fabricated Al grating structures. Well defined plasmonic resonances were measured in the reflectance spectra. Optimized grating structure integrated photodetectors exhibited more than sevenfold photocurrent enhancement. Finite difference time domain simulations revealed that both geometrical and plasmonic effects played role in photocurrent enhancement.
authors.affiliation: Nanotechnology Research Center, Bilkent University, Bilkent, 06800 Ankara, Turkey. butun@bilkent.edu.tr
authors.forename: Serkan
authors.initials: S
authors.lastname: Butun
authors.forename: Neval A
authors.initials: NA
authors.lastname: Cinel
authors.forename: Ekmel
authors.initials: E
authors.lastname: Ozbay
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005708:Gallium / Q000737:chemistry* / Q000528:radiation effects; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D010783:Photometry / Q000295:instrumentation*; D012666:Semiconductors; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014466:Ultraviolet Rays
chemical_list: C473348:gallium nitride; D005708:Gallium