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Investigation of plasmonic properties of spin coated and spray coated IZO thin film

Plasmonics deals with the study of the interaction of nanometre-scale materials with light, has excellent potential in unique applications such as communication, subwavelength guiding, optical cloaking, etc. Metals such as gold and silver have been conventionally used as plasmonic materials because of the high carrier concentration. Their associated plasma frequency lies in the ultraviolet range. The significant absorption loss at lower frequencies across near-infrared and fixed carrier density of electron of metals forced researchers for alternative materials. The material system, such as conducting metal oxides with low loss and tunable optical properties, is considered as a potential candidate for plasmonic applications in the near-infrared. The response of electrons with photons can be understood on the basis of the dielectric permittivity of materials. The real part of this complex dielectric constant defines the capability of material gets polarized, while the imaginary part indicates the material loss while polarizing. In this study, indium doped zinc oxide thin films were deposited on glass substrate by spin coating (IZO1) and spray coating (IZO2) for low-loss plasmonic applications in near IR. Structural conformation of the films was carried out by XRD. Films deposited at the optimized conditions exhibited a carrier concentration of ∼1020/cm3. The zero cross over wavelength of real permittivity was extracted using the dielectric permittivity. The negative real permittivity obtained beyond 2008 nm for IZO1 thin film and 2126nm for IZO2 film, which confirmed the plasmonic behaviour of these in the NIR wavelength. The losses calculated for the film are smaller than that of conventional films in the near IR. These films are promising low loss alternative materials to conventional metals for the plasmonic device applications in near IR.