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Design and Numerical Analysis of Hyperbolic Metamaterial Based Ultrasensitive E. Coli Sensor | | Dip Sarker
; Ahmed Zubair
; | | Date: |
1 Sep 2023 | | Abstract: | We proposed an extremely sensitive extit{E. Coli} sensor based on a
hyperbolic metamaterial structure combining ultra-thin Ag-Al$_2$O$_3$ layers to
minimize metallic optical loss. The principle relied on detecting the change in
the resonance wavelength due to the interaction of bacteria with the
surrounding aqueous environment by utilizing the finite-difference time-domain
numerical technique. Our proposed hyperbolic metamaterial extit{E. Coli}
sensor operated in the range from visible to near-infrared wavelengths
exhibiting strong bulk plasmon polaritons at the hyperbolic regime ($lambda
geq$ 460 nm). An anisotropic hyperbolic range was obtained theoretically by
solving the effective medium theory. An outstanding sensitivity of 9000 nm per
bacteria was achieved for a bulk plasmon-polariton mode. The hyperbolic
metamaterial was the origin of obtaining such extremely high sensitivity; no
bulk plasmon polaritons were found without hyperbolic metamaterial. We analyzed
the effect of different shapes in two-dimensional Ag differential grating on
sensing performance. Additionally, we compared the performance parameters of
our proposed extit{E. Coli} sensor with recently demonstrated sensors. Our
proposed hyperbolic metamaterial structure has the potential as a highly
sensitive extit{E. Coli} sensor operating in a wide range of wavelengths for
label-free detection. | | Source: | arXiv, 2309.00290 | | Services: | Forum | Review | PDF | Favorites | |
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