Abstract
In this paper we investigate the use of active coated nanoparticles (CNPs) for nano-sensing applications. Simulation results of the optical properties of an active CNP with a 24nm radius active silica core and 6nm thick plasmonic shell made of silver that has been functionalized by an additional spherical outer layer of varying thickness and refractive index are presented. In particular, the effects of the functional-layer thickness and refractive index on the super-resonant (SR) state of the active CNP are presented. It is shown that the wavelength and optical gain required to excite the SR state may provide both a spectral and a power signature usable for nano-scale sensing and that these signatures may be used to identify the dimensions and optical properties of the functional layer. These results are then applied to the case of a functional layer containing a solution of human hemoglobin. It is demonstrated that the concentration of hemoglobin may be remotely determined from these SR signatures.
Highlights
In sensing applications on the nanometer scale, quantities of measurable interest include the dimensions and refractive index of nano-objects
Simulation results of the optical properties of an active coated nanoparticles (CNPs) with a 24nm radius active silica core and 6nm thick plasmonic shell made of silver that has been functionalized by an additional spherical outer layer of varying thickness and refractive index are presented
In this paper we investigated the use of active CNPs for nano-sensing applications
Summary
In sensing applications on the nanometer scale, quantities of measurable interest include the dimensions and refractive index of nano-objects. In this paper we investigate the optical properties of a highly resonant nanometer-sized active dielectric sphere that is coated with a silver plasmonic shell and surrounded by a dielectric layer of some thickness and refractive index This basic active coated nano-particle (CNP) was studied extensively in [1]. It has been demonstrated that these silver-silica CNPs exhibit tunable plasmon resonances at shorter wavelengths with a 10% larger enhancement than for the corresponding gold-silica CNPs and, that they can be used to cover a wider portion of the optical spectrum In contrast to these investigations and applications of passive CNPs, the research presented here explicitly explores the properties and applications of active CNPs
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