scholarly journals An electro-tunable Fabry–Perot interferometer based on dual mirror-on-mirror nanoplasmonic metamaterials

Nanophotonics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 2279-2290 ◽  
Author(s):  
Debabrata Sikdar ◽  
Alexei A. Kornyshev
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Effective Medium Theory ◽  
Optical Cavity ◽  
Small Variation ◽  
Optical Transmittance ◽  
Metallic Electrode ◽  
Thin Metallic Film ◽  
Electrode Potentials ◽  
Fabry Perot

AbstractMirror-on-mirror nanoplasmonic metamaterials, formed on the basis of voltage-controlled reversible self-assembly of sub-wavelength-sized metallic nanoparticles (NPs) on thin metallic film electrodes, are promising candidates for novel electro-tunable optical devices. Here, we present a new design of electro-tunable Fabry–Perot interferometers (FPIs) in which two parallel mirrors – each composed of a monolayer of NPs self-assembled on a thin metallic electrode – form an optical cavity, which is filled with an aqueous solution. The reflectivity of the cavity mirrors can be electrically adjusted, simultaneously or separately, via a small variation of the electrode potentials, which would alter the inter-NP separation in the monolayers. To investigate optical transmittance from the proposed FPI device, we develop a nine-layer-stack theoretical model, based on our effective medium theory and multi-layer Fresnel reflection scheme, which produces excellent match when verified against full-wave simulations. We show that strong plasmonic coupling among silver NPs forming a monolayer on a thin silver-film substrate makes reflectivity of each cavity mirror highly sensitive to the inter-NP separation. Such a design allows the continuous tuning of the multiple narrow and intense transmission peaks emerging from an FPI cavity via electro-tuning the inter-NP separation in situ – reaping the benefits from both inexpensive bottom-up fabrication and energy-efficient tuning.

Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

2017 ◽  
Vol 13 (2) ◽  
pp. 4671-4677 ◽  
Author(s):  
A. M. Abdelghany ◽  
A.H. Oraby ◽  
Awatif A Hindi ◽  
Doaa M El-Nagar ◽  
Fathia S Alhakami
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Bimetallic Nanoparticles ◽  
Reduction Process ◽  
Nano Particles ◽  
Nano Structure ◽  
Small Shift ◽  
Molar Ratios ◽  
Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

Topological liquid crystal superstructures as structured light lasers

2021 ◽  
Vol 118 (49) ◽  
pp. e2110839118
Author(s):  
Miha Papič ◽  
Urban Mur ◽  
Kottoli Poyil Zuhail ◽  
Miha Ravnik ◽  
Igor Muševič ◽  
...  
Keyword(s):  
Self Assembly ◽  
Soft Matter ◽  
Structured Light ◽  
Topological Defects ◽  
Photonic Devices ◽  
Light Polarization ◽  
Self Healing ◽  
Fabry Perot ◽  
Self Assembled ◽  
External Stimuli

Liquid crystals (LCs) form an extremely rich range of self-assembled topological structures with artificially or naturally created topological defects. Some of the main applications of LCs are various optical and photonic devices, where compared to their solid-state counterparts, soft photonic systems are fundamentally different in terms of unique properties such as self-assembly, self-healing, large tunability, sensitivity to external stimuli, and biocompatibility. Here we show that complex tunable microlasers emitting structured light can be generated from self-assembled topological LC superstructures containing topological defects inserted into a thin Fabry–Pérot microcavity. The topology and geometry of the LC superstructure determine the structuring of the emitted light by providing complex three-dimensionally varying optical axis and order parameter singularities, also affecting the topology of the light polarization. The microlaser can be switched between modes by an electric field, and its wavelength can be tuned with temperature. The proposed soft matter microlaser approach opens directions in soft matter photonics research, where structured light with specifically tailored intensity and polarization fields could be designed and implemented.

scholarly journals A molecular spin-crossover film allows for wavelength tuning of the resonance of a Fabry–Perot cavity

2020 ◽  
Vol 8 (24) ◽  
pp. 8007-8011 ◽  
Author(s):  
Yuteng Zhang ◽  
Karl Ridier ◽  
Victoria Shalabaeva ◽  
Isabelle Séguy ◽  
Sylvain Pelloquin ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Optical Cavity ◽  
Wavelength Tuning ◽  
Wavelength Tunable ◽  
Fabry Perot ◽  
Molecular Spin

A wavelength-tunable optical cavity was constructed using spin crossover molecules.

Self-assembly of metallic nanoparticles into plasmonic rings

2011 ◽  
Vol 99 (12) ◽  
pp. 123110 ◽  
Author(s):  
Thomas Lerond ◽  
Julien Proust ◽  
Hélène Yockell-Lelièvre ◽  
Davy Gérard ◽  
Jérôme Plain
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles

scholarly journals Self-assembly of highly efficient, broadband plasmonic absorbers for solar steam generation

2016 ◽  
Vol 2 (4) ◽  
pp. e1501227 ◽  
Author(s):  
Lin Zhou ◽  
Yingling Tan ◽  
Dengxin Ji ◽  
Bin Zhu ◽  
Pei Zhang ◽  
...  
Keyword(s):  
Light Absorption ◽  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Large Scale ◽  
Strong Field ◽  
Local Heating ◽  
Field Enhancement ◽  
Solar Irradiation ◽  
Steam Generation ◽  
Solar Steam Generation

The study of ideal absorbers, which can efficiently absorb light over a broad range of wavelengths, is of fundamental importance, as well as critical for many applications from solar steam generation and thermophotovoltaics to light/thermal detectors. As a result of recent advances in plasmonics, plasmonic absorbers have attracted a lot of attention. However, the performance and scalability of these absorbers, predominantly fabricated by the top-down approach, need to be further improved to enable widespread applications. We report a plasmonic absorber which can enable an average measured absorbance of ~99% across the wavelengths from 400 nm to 10 μm, the most efficient and broadband plasmonic absorber reported to date. The absorber is fabricated through self-assembly of metallic nanoparticles onto a nanoporous template by a one-step deposition process. Because of its efficient light absorption, strong field enhancement, and porous structures, which together enable not only efficient solar absorption but also significant local heating and continuous stream flow, plasmonic absorber–based solar steam generation has over 90% efficiency under solar irradiation of only 4-sun intensity (4 kW m−2). The pronounced light absorption effect coupled with the high-throughput self-assembly process could lead toward large-scale manufacturing of other nanophotonic structures and devices.

Optimizing the external optical cavity parameters for performance improvement of a fiber grating Fabry–Perot laser

2015 ◽  
Vol 22 (2) ◽  
pp. 278-288 ◽  
Author(s):  
Hisham Kadhum Hisham ◽  
Ahmad Fauzi Abas ◽  
Ghafour Amouzad Mahdiraji ◽  
Mohd Adzir Mahdi ◽  
Faisal Rafiq Mahamd Adikan
Keyword(s):  
Performance Improvement ◽  
Optical Cavity ◽  
Fiber Grating ◽  
Fabry Perot

Large-Scale Hierarchical Self-Assembly Structures from Gold Nanoparticles

2007 ◽  
Vol 1059 ◽  
Author(s):  
Nam-Jung Kim ◽  
Hao Li
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Large Scale ◽  
Room Temperature ◽  
Solid Substrate ◽  
Ionic Surfactant ◽  
Particle Nucleation ◽  
Low Density ◽  
Density Region ◽  
Sem Image

ABSTRACTMetallic nanoparticles may form hierarchical dendrites in the presence of ionic surfactant through self-assembly upon solvent drying at room temperature. With nanoparticle density varying in the drying area on the supporting solid substrate, the morphology and relevant size of the dendrites evolve in different structures. At the region where the nanoparticle density is high, the large dendrite can develop with manifest crystal symmetry. At the low density region, many small sizes of compact crystals can be found, indicating that particle nucleation dominates over the long-range crystal growth. SEM image reveals the ordered stacking of gold nanoplates over the long dendrite branches, resembling the liquid crystal array. We present the possible physical origins to explain the various structures of the assembled dendrites during the solvent evaporation at the interface of solid and air.

Optical cavity characterization of the Tor Vergata Fabry-Pérot interferometer

2014 ◽  
Author(s):  
Luca Giovannelli ◽  
Francesco Berrilli ◽  
Dario Del Moro ◽  
Vincenzo Greco ◽  
Roberto Piazzesi ◽  
...  
Keyword(s):  
Optical Cavity ◽  
Fabry Perot
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