Please use this identifier to cite or link to this item: https://doi.org/10.1088/2399-1984/aabe00
Title: A modified abstraction of Sierpinski fractals towards enhanced sensitivity of a cross-coupled bow-tie nanostructure
Authors: Hasan, Dihan 
Lee, Chengkuo 
Keywords: Science & Technology
Technology
Physical Sciences
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Science & Technology - Other Topics
Materials Science
Physics
bow-tie
cross-coupling
fractal
optical magnetism
Sierpinski
FILMS
METAMATERIALS
RESONANCES
PLASMONICS
ARRAYS
MODEL
Issue Date: 2018
Publisher: IOP PUBLISHING LTD
Citation: Hasan, Dihan, Lee, Chengkuo (2018/06/01). A modified abstraction of Sierpinski fractals towards enhanced sensitivity of a cross-coupled bow-tie nanostructure. NANO FUTURES 2 (2). ScholarBank@NUS Repository. https://doi.org/10.1088/2399-1984/aabe00
Abstract: We experimentally demonstrate a modified abstraction of a fractal geometry (up to order M=2), namely the Sierpiński fractal, with intrinsic self-similarity for a multitude of infrared sensing applications. The modification particularly strengthens the dipolar resonance and enables optical magnetism at longer wavelengths on a relatively miniaturized footprint. In contrast to the conventional resonant sensing, we harness the broadband electric field enhancement of the modified fractal patterns originating from the lightning rod effect in the non-resonant regime. We demonstrate strong enhancement of molecular absorption at mid-IR by the fractal patterns in the non-resonant regime even under extreme thermal broadening. Finally, we extend the work towards the functional study of the molecular fingerprint of ultra-thin film (∼5 nm) on a non-complementary metamaterial platform in the non-resonant regime. With the help of the solid state chemical dewetting of the monolayer, we also successfully demonstrate a new type of cross-coupling mediated sensitivity of the multispectral and mutually coupled fractal patterns. The research clearly indicates the usefulness of broadband electric field enhancement by the second order fractal pattern for on chip, complete profiling of mid-IR fingerprints of biological elements, i.e. cell, and protein monolayer on a limited footprint and under versatile morphological states.
Source Title: NANO FUTURES
URI: https://scholarbank.nus.edu.sg/handle/10635/188920
ISSN: 23991984
DOI: 10.1088/2399-1984/aabe00
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