Optical response of a bowtie nano-antenna in diverse refractive indices of the sounding medium is investigated, including both cases of parallel and normal polarization of the incident beam's electric field, regarding the major axis of the antenna. Results indicate that an increase in the refractive index lowers the amplitude of the normalized electric field and red shifts the resonance. This alteration may find various applications such as in biosensors.

Keywords: bowtie nanoantenna, refractive index of the surrounding medium, resonant frequency, polarization of the incident light

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