Wet-Chemical Etching: a Novel Nanofabrication Route to Prepare Broadband Random Plasmonic Metasurfaces

Kumar, Piragash R M and Venkatesh, Anusha and Moorthy, V H S (2019) Wet-Chemical Etching: a Novel Nanofabrication Route to Prepare Broadband Random Plasmonic Metasurfaces. Plasmonics, 14. pp. 365-374. ISSN 1557-1955

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Abstract

Broadband optical metasurfaces are gaining enormous attention owing to their potential applications in optoelectronic devices, sensors, and flat optics. Here, we demonstrate for the first time a single-step, novel wet-chemical etching-based nanofabrication method to produce broadband random plasmonic metasurfaces (RPMS). The nanofabrication method is inexpensive, simple, versatile, and compatible with semiconductor processing technologies. The RPMS is made of a single-layer optically thick Ag thinfilmnanostructuredwithrandomnanoholesandnanocavities.ThebuildingblockoftheRPMSisamulti-resonantmeta-cell composed of disordered nanoholes with variety of sizes, shapes, and aspect ratios. The composition of the multi-resonant metacell canbemodifiedbyvaryingthedurationofimmersion(DoI) oftheAgthinfilmsintheetchant solution.TheRPMSexhibits broadbandextraordinarytransmissioninthe550–800nmwavelengthrangewithanefficiencyoftransmissionof2.3.Broadband absorption of light is observed in the entire visible region; incident light is strongly absorbed (~70%) in the nanocavities via localized surface plasmons (LSPs) in the 400–550 nm wavelength range. Further, 40–50% of the light is absorbed in the metal film via surface plasmon polaritons (SPPs) excited by the multi-resonant meta-cells, elsewhere on the spectrum. The RPMS exhibits Lambertian type scattering with nearly 50% efficiency in the entire visible wavelength range. The RPMS with these broadband optical properties can find useful applications in plasmonic solar cells, surface-enhanced Raman spectroscopy (SERS), thermoplasmonic devices, and plasmoelectric potentials based all-metal optoelectronic devices

Item Type: Article
Uncontrolled Keywords: Wet-chemical etching . Random plasmonic metasurfaces . Optical metasurfaces . Broadband absorption . Scattering andplasmonicsolarcells
Subjects: Engineering > MIT Manipal > Electronics and Communication
Depositing User: MIT Library
Date Deposited: 20 Aug 2019 04:41
Last Modified: 20 Aug 2019 04:41
URI: http://eprints.manipal.edu/id/eprint/154410

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