Abstract

Medical physics offers super oscillatory lenses (SOL) to attain subwavelength focusing for efficient image resolution in the detection of a single molecule. In this paper, we propose a negative-indexed permeability-controlled meta SOL, which restores the light concentration via exciting surface plasmon resonance and enhances luminescence at our region of interest, i.e., fluid sample (${S_L}$). The meta SOL is aperture-free in comparison with other techniques (zero-mode waveguides and nano antennas) and hence avoids the constraints, which are posed by nano apertures, to insert a small volume of $ S_L $ into these nano apertures for detection purposes. The meta SOL is a unique combination of gold split rings mounted on silicon dioxide (${{\rm SiO}_2}$) substrate and operational in the near-ultraviolet (UV) region. We utilized the phenomena of negative index of refraction, and our simulated trails exploit the magnetic (${\mu _r}$) response of the meta SOL by analyzing its transmission spectra in the frequency range from 3.53 to 3.57 Peta Hz. We observe the methodical response of the meta SOL with its ample potential to surpass the resolution at a working wavelength of $\lambda ={84.173}\;{\rm nm}$, which enhances luminescence by restoring the evanescent UV magnetic field (${B_{\rm UV}}$) at ${S_L}$. This technique will offer a new and easy approach to uplift the efficiency of super oscillatory lenses in the near-UV regime to benefit single molecule detection techniques and thus the novelty.

© 2020 Optical Society of America

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