Journal ArticleDOI
Imaging the Engineered Polarization States of Surface Plasmon Polaritons at Visible Wavelengths
Pankaj Arora,A. Krishnan +1 more
TLDR
In this article, a thin homogeneous metal layer was sandwiched between the substrate and the periodic metal patterns to outcouple the SPPs as leakage radiation through the substrate, which resulted in the detection of SPP excitation as transmission peaks in a dark background.Abstract:
We experimentally demonstrate and image the hybrid nature of surface plasmon polaritons (SPPs) at visible wavelengths excited in low aspect ratio 1D and 2D periodic plasmonic structures with periods nearly equal to the resonance wavelengths, fabricated on thin homogeneous metal-coated glass substrates A thin homogeneous metal layer was sandwiched between the substrate and the periodic metal patterns to out-couple the SPPs as leakage radiation through the substrate This resulted in the detection of SPP excitation as transmission peaks in a dark background, as opposed to transmission dips in a bright background in the structures without the metal layer reported earlier Due to the periods being almost equal to the resonance wavelengths, the transmission peaks were not due to extraordinary transmission phenomenon, but because of the radiative leakage of wavelength selective SPPs excited on the surface A cross-axis polarizer–analyzer was used in broadband leakage radiation microscopy to diminish the direct zeroth-order transmission and image the real and Fourier plane characteristics of the SPP transmission The bright emission of different colors against a dark background corresponding to the transmission plasmonic resonances for different periods, in both real and Fourier plane revealed the hybrid nature of excited SPPs, when the polarizer was positioned at 45 $^\circ$ with respect to the grating vector The fabricated plasmonic substrates present interesting opportunities for imaging and sensing applicationsread more
Citations
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Journal ArticleDOI
Dispersion engineering with plasmonic nano structures for enhanced surface plasmon resonance sensing.
TL;DR: The results indicate that the integrated SPR-nanograting device shows a great promise as a sensor for various types of analytes and the role of plasmonic nanograting in enhancing the performance of an SPR sensor is analyzed.
Journal ArticleDOI
Fourier plane colorimetric sensing using broadband imaging of surface plasmons and application to biosensing
Pankaj Arora,A. Krishnan +1 more
TL;DR: In this paper, the authors demonstrate an optical technique for refractive index and thickness sensing of sub-wavelength-thick dielectric analytes, which utilizes the broadband, multimode, directional leakage radiation arising from the excitation of hybrid mode surface plasmons (SP) on low aspect ratio periodic plasmonic substrates with period ≈λ.
Journal ArticleDOI
Aluminum-Based Engineered Plasmonic Nanostructures for the Enhanced Refractive Index and Thickness Sensing in Ultraviolet-Visible-Near Infrared Spectral Range
TL;DR: In this article, Al-based periodic nanostructures on top of a thin homogeneous Al metal coated on a BK-7 glass substrate were designed by systematic variation of geometrical parameters using Rigorous Coupled Wave Analysis and finite elements full wave solver.
Journal ArticleDOI
On-chip label-free plasmonic based imaging microscopy for microfluidics
Pankaj Arora,A. Krishnan +1 more
TL;DR: In this paper, an on-chip label-free imaging microscopy using real and Fourier Plane (FP) dark field images of surface plasmons, by integrating engineered plasmonic substrates with different shapes of microfluidic channels, was demonstrated and an index resolution of 1.63 × 10−4 RIU was achieved by quantifying CMYK components of captured images.
Proceedings ArticleDOI
Self-referenced integrated plasmonic device based on engineered periodic nanostructures for sensing applications
Pankaj Arora,Sambhavi Shukla +1 more
TL;DR: In this paper, a self-referenced plasmonic device with self-reference capability that uses periodic nanostructures has been proposed and analyzed in terms of the spectral response.
References
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Terahertz surface plasmon-polariton propagation and focusing on periodically corrugated metal wires
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