2,147 research outputs found
Nanoscale magnetophotonics
This Perspective surveys the state-of-the-art and future prospects of science
and technology employing the nanoconfined light (nanophotonics and
nanoplasmonics) in combination with magnetism. We denote this field broadly as
nanoscale magnetophotonics. We include a general introduction to the field and
describe the emerging magneto-optical effects in magnetoplasmonic and
magnetophotonic nanostructures supporting localized and propagating plasmons.
Special attention is given to magnetoplasmonic crystals with transverse
magnetization and the associated nanophotonic non-reciprocal effects, and to
magneto-optical effects in periodic arrays of nanostructures. We give also an
overview of the applications of these systems in biological and chemical
sensing, as well as in light polarization and phase control. We further review
the area of nonlinear magnetophotonics, the semiconductor spin-plasmonics, and
the general principles and applications of opto-magnetism and nano-optical
ultrafast control of magnetism and spintronics
Fabrication of high quality sub-micron Au gratings over large areas with pulsed laser interference lithography for SPR sensors
Metallic gratings were fabricated using high energy laser interference
lithography with a frequency tripled Nd:YAG nanosecond laser. The grating
structures were first recorded in a photosensitive layer and afterwards
transferred to an Au film. High quality Au gratings with a period of 770 nm and
peak-to-valley heights of 20-60 nm exhibiting plasmonic resonance response were
successfully designed, fabricated and characterized.Comment: 10 pages, 7 figure
Tunable grating-assisted surface plasmon resonance by use of nano-polymer dispersed liquid crystal electro-optical material
This paper reports on the experimental observation of the displacement of a surface plasmon resonance (SPR) excited by a metallic diffraction grating. This effect is achieved by the use of an electro-optical material composed of nano-sized droplets of liquid crystals dispersed in a host polymer. The average refractive index of this material in the form of a thin film on the undulated metal surface can be modified with the application of an external electric field and to tune the wavelength at which the SPR excitation leads to a reflection minimum. The theoretical design and experimental demonstration of the principle of this component are described
On the performance of a tunable grating-based high sensitivity unidirectional plasmonic sensor
Optical biosensing is currently an intensively active research area, with an increasing demand of highly selective, sensitivity-enhanced and low-cost devices where different plasmonic approaches have been developed. In this work we propose a tunable optimized grating-based gold metasurface that can act both as a high sensitivity sensor device (up to 1500 nm/RIU) and as an unidirectional plasmon source. The theory behind surface plasmon polariton generation is recalled to thoroughly understand the influence that every parameter of the grating source has on the performance of the proposed device. The results and conclusions discussed here offer a key step toward the design of biosensors based on excitation of surface plasmons polaritons by grating-based structures or in the process of creating new nanophotonic circuit devices.We gratefully acknowledge financial support from Spanish national project INMUNOTERMO (No. PGC2018-096649-B-I). J. G-C. thanks the Ministry of science of Spain for his FPI grant. G. S. thanks the Ministry of education for his collaboration grant and P.A. acknowledges funding for a Ramon y Cajal Fellowship (Grant No. RYC-2016-20831)
Recent advances in plasmonic sensor-based fiber optic probes for biological applications
Funding: This research was funded by National Natural Science Foundation of China (NSFC), grant number [61675008]. Acknowledgments: KN wishes to thank The Royal Society Kan Tong Po International Fellowship 2018 for the travel fund to visit Hong Kong Polytechnic University and Shenzhen Science and Technology Innovation Commission (Project GJHZ20180411185015272).Peer reviewedPublisher PD
Microfluidics for plasmonic sensors
Ankara : The Program of Materials Science and Nanotechnology and the Institute of Engineering and Sciences of Bilkent University, 2009.Thesis (Master's) -- Bilkent University, 2009.Includes bibliographical references leaves 62-65.In this thesis, we integrate microfluidics with grating-coupled surface plasmon
configurations for sensing applications. First, in order to observe optimal
excitations, we introduce procedures for modification of the surface profiles of
gratings acquired from commercially available optical storage disks. A must
requirement in plasmonic systems, thin film metal deposition is performed. Soft
lithographic techniques are applied to coated disks to transfer the surface
topography of the disks to an elastomeric material, PDMS. Optical lithography is
used to fabricate microfluidic channels to where fluid will be injected. After
fabricating the final structure, ellipsometric measurement is used to investigate
the device performance. Experimental results were in consistence with the
theoretical simulations providing similar behaviours of reflection spectra. The
resonance wavelengths are found to be occuring very near to the expected values
along with high quality factors. However, to the device structure, an intensity loss
is observed which can be further improved. We achieved the tuning of the
resonance wavelength by changing the refractive index of the medium inside the
microchannel. Integration of the microfluidic channel to surface plasmon studies
may open up many applications such as biomolecular sensing.ErtaĹź, Yavuz NuriM.S
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