pinecone/core-2020-05-10-deduplication huggingface dataset:
Functionalized Transparent Surfaces with Enhanced  Self-Cleaning against Ink Aerosol Contamination

During operation of a standard commercial inkjet printer, suspended ink particles form an ink aerosol inside the printing chamber that can cause serious malfunctions, including contamination of the transparent window of the printhead position calibration optical sensors. In this work, transparent conducting film (TCF) and surface functionalization through self-assembled monolayer (SAM) are proposed and investigated to repel ink aerosol deposition on a transparent surface and to reduce its adverse effects. The results show that the combination of the Joule heating effect induced by applying an electrical current to the TCF and hydrophobic property of the SAM reduces transmittance loss from an average of 10% to less than 1.5%. Correspondingly, the area of the surface covered by ink decreases from 45.62% ± 6.15% to 1.71% ± 0.25%. The preliminary results are obtained with glass substrates and subsequently extended to the plastic window of a commercial inkjet printer calibration sensor, thus demonstrating the potential of the proposed approach to reduce aerosol contamination in real applications.Peer ReviewedPostprint (author's final draft
Transparent, Flexible, and Passive Thermal Touch Panel

This work presents a touch panel concept, which is enabled by a novel designof thin film thermocouples. The design offers a simple implementation byutilizing a single thin film to function as an array of thermocouples. Theconcept is demonstrated as a flexible, passive, and highly transparent touchpanel. The passive nature of the thermoelectric touch recognition allows theperformance of the presented sensor to be optimal at moderate sheet resistancevalues of the transparent conductive layers. Hence, the concept is highlypotential for low-cost large-area applications and does not rely on costlylow sheet resistance materials such as indium tin oxide. The demonstratorpresented in this work achieves a signal-to-noise ratio of 20 with a rise timeof 90 ms and is able to distinguish individual touches, sweeping with finger,as well as touching by multiple fingers at the same time. In addition, the conceptmay also be used in other thermal distribution mapping applications.Not peer reviewe
Plasmonic enhancement in the fluorescence of organic and biological molecules by  photovoltaic tweezing assembly

This is the peer reviewed version of the following article: Advanced Materials Technologies 2.8 (2017): 1700024, which has been published in final form at http://dx.doi.org/10.1002/admt.201700024. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-ArchivingThe potential of photovoltaic tweezers to produce plasmonic platforms for fluorescence 
enhancement of organic or biological molecules is demonstrated. 1D and 2D patterns of silver nanoparticles have been produced on the surface of LiNbO3:Fe substrates using this 
photovoltaic tool, which allows depositing in parallel a large number of particles in accordance with imposed 1D and 2D light profiles. The nanoparticle patterns reveal a variety of plasmonic features whose resonances cover a broad spectral range and are able to produce efficient fluorescence enhancement. First a remarkable average enhancement factor of ten has been measured for Disperse Red 1 organic molecules deposited on the patterns. Clear enhancements have been also obtained from fluorescein labeled biological molecules (DNA and asynthetic peptide). Finally, the possibility of using the photo-electrically generated metallic patterns with other substrates is also demonstrated by enhancement experiments for which the nanoparticle pattern has been transferred to a non-photovoltaic substrateThis work was supported by the funding of the Ministerio de Economía y Competitividad of Spain under the project MAT2014-57704-C3. M. A. Díaz also acknowledges Spanish Government (MINECO) and the European Community (FEDER) through Grant MAT2015-66586-
Amplified Spontaneous Emission in Pentathienoacene Dioxides by Direct Optical Pump and by Energy Transfer: Correlation with Photophysical Parameters

Amplified spontaneous emission (ASE) is observed, under optical pump, in polystyrene films doped with two pentathienoacene derivatives functionalised with thienyl-S,S-dioxide groups (compounds 2 and 3). The effect of the dioxide groups on the ASE properties is analysed by comparing the performance with that of its corresponding non-oxidized analogue (1). Films containing either 2 or 3 show ASE at 511 and 574 nm, respectively, when excited directly (at 435 nm) on their absorption bands, showing thresholds and linewidths larger than those obtained from films doped with 1, pumped at 355 nm. ASE is also observed under excitation at 355 nm, in samples containing 1 (host) and either 2 or 3 (guests), due to energy transfer from host to guest. For the blends with 3, the ASE threshold is lower than that obtained when the films are excited directly. Results are interpreted in terms of the photophysical parameters such as absorption capacity, fluorescence efficiency, singlet-to-triplet intersystem crossing leading to triplet-triplet re-absorptions, bimolecular energy-transfer efficiency, efficiency of internal conversion process, etc. State-of-the-art quantum chemical calculations are used in the interpretation of the experimental results.Authors from the University of Alicante acknowledge support from the Spanish Government (MINECO) and the European Community (FEDER) through grants MAT2008–06648-C02–01 and MAT2011–28167-C02–01. The work at the University of Málaga is supported by the MEC projects CTQ2012–33733 and by the PO9–4708 project by the Junta de Andalucía. Raquel Rondão acknowledges FCT for a PhD grant (SFRH/BD/38882/2007). D.A.S.F. gratefully acknowledges the financial support from the Brazilian Research Councils: CAPES, CNPq (grant 303084/2010–3) and FAP-DF (Fundação de Apoio à Pesquisa do Distrito Federal)
Manipulation of Asymmetric Transmission in Planar Chiral Nanostructures by Anisotropic Loss

Cataloged from PDF version of article.Planar chiral structures may provide asymmetric transmission for circularly polarized optical waves at normal incidence if the structures are anisotropic and lossy, but the role of loss has not yet been clarified. Here, a typical planar chiral structure is studied, and the mechanism of asymmetric transmission is analyzed. It is demonstrated for the first time that asymmetric transmission can be manipulated by changing the anisotropy of loss. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
1,7-Bay-Substituted Perylenediimide Derivative with Outstanding Laser Performance

Efficient ASE at wavelengths >620 nm from PS films doped with a bay-substituted perylenediimide (PDI) derivative is reported. The maximum PDI content is around 40 times larger than in prior studies. The ability to introduce large dye amounts into the film without photoluminescence (PL) quenching allows very high PL and ASE efficiencies with low thresholds. A distributed feedback (DFB) laser device using one of the best-performing films is fabricated and characterized.We thank support from the Spanish Government (MINECO), the European Community (FEDER) and the Generalitat Valenciana through MAT-2011–28167-C02, CTQ2011–26455, PROMETEO 2012/010 and ISIC/2012/008, as well as to the University of Alicante and the University Miguel Hernández de Elche
Photo-patterning of highly efficient state-of-the-art phosphorescent OLEDs using orthogonal hydrofluoroethers

The authors kindly acknowledge the financial support by the Free State of Saxony, the Sächsische Aufbaubank (SAB, Project Nr. 100087862), and the European Social Fund (ESF).Photolithography offers a scalable solution for large area pixel patterning of organic light-emitting diode (OLED) displays. It has been limited due to the incompatibility of traditional processing steps with the majority of organic materials. In this work, photolithographic structuring of state-of-the-art phosphorescent red p-i-n OLEDs is demonstrated using fluorinated polymers in combination with hydrofluoroether solvents. This is the first report on photolithographically patterned OLEDs with state-of-the-art efficiency and good long-term stability.PostprintPeer reviewe
Diamond Nanophotonics

The burgeoning field of nanophotonics has grown to be a major research area, primarily because of the ability to control and manipulate single quantum systems (emitters) and single photons on demand. For many years studying nanophotonic phenomena was limited to traditional semiconductors (including silicon and GaAs) and experiments were carried out predominantly at cryogenic temperatures. In the last decade, however, diamond has emerged as a new contender to study photonic phenomena at the nanoscale. Offering plethora of quantum emitters that are optically active at room temperature and ambient conditions, diamond has been exploited to demonstrate super-resolution microscopy and realize entanglement, Purcell enhancement and other quantum and classical nanophotonic effects. Elucidating the importance of diamond as a material, this review will highlight the recent achievements in the field of diamond nanophotonics, and convey a roadmap for future experiments and technological advancements
Ultra-broadband polarisers based on metastable free-standing aligned carbon nanotube membranes

A carbon nanotube free-standing linearly dichroic polariser is developed using solid-state extrusion. Membrane cohesion is experimentally and numerically demonstrated to derive from inter-tube van der Waals interactions in this family of planar metastable morphologies, controlled by the chemical vapour deposition conditions. Ultra-broadband polarisation (400 nm – 2.5 mm) is shown and corroborated by effective medium and full numerical simulations.This work was supported by the Isaac Newton Trust, Trinity College Cambridge University. M. T. Cole thanks the Winston Churchill Memorial Trust and the Oppenheimer Research 
Fellowship, Cambridge University, for generous financial support.This is the author accepted manuscript. The final version is available from Wiley at http://onlinelibrary.wiley.com/doi/10.1002/adom.201400238/abstract
Selectively patterning polymer opal films via microimprint lithography

Large-scale structural color flexible coatings have been hard to create, and patterning the color on them is key to many applications, including large-area strain-sensors, wall-size displays, security devices, and smart fabrics. To achieve controlled tuning, a micro-imprinting technique is applied here to pattern both the surface morphology and the structural color of the polymer opal films (POFs). These POFs are made of 3D ordered arrays of hard spherical particles embedded inside soft shells. The soft outer shells cause the POFs to deform upon imprinting with a pre-patterned stamp, driving a flow of the soft polymer and a rearrangement of the hard spheres within the films. As a result, a patterned surface morphology is generated within the POFs and the structural colors are selectively modified within different regions. These changes are dependent on the pressure, temperature and duration of imprinting, as well as the feature sizes in the stamps. Moreover the pattern geometry and structural colors can then be further tuned by stretching. Micropattern color generation upon imprinting depends on control of colloidal transport in a polymer matrix under shear flow and brings many potential applications involving stretchability and tunability, as well as being of fundamental interest.This is the final version. It was first published in Advanced Optical Materials by Wiley at http://onlinelibrary.wiley.com/doi/10.1002/adom.201400327/abstract
Optical properties of gyroid structured materials: from photonic crystals to metamaterials

The gyroid is a continuous and triply periodic cubic morphology which 
possesses a constant mean curvature surface across a range of volumetric  ll fractions. Found in a variety of natural and synthetic systems which form through self-assembly, from buttery wing scales to block copolymers, the gyroid also exhibits an inherent chirality not observed in any other similar morphologies. These unique geometrical properties impart to gyroid structured materials a host of interesting optical properties. Depending on the length scale on which the constituent materials are organised, these properties arise from starkly di erent physical mechanisms (such as a complete photonic band gap for photonic crystals and a greatly depressed plasma frequency for optical metamaterials). This article reviews the theoretical predictions and experimental observations of the optical properties of two fundamental classes of gyroid structured materials: photonic crystals (wavelength scale) and metamaterials (subwavelength scale).This work was supported by the EPSRC through the Cambridge 
NanoDTC EP/G037221/1, EP/G060649/1, EP/L027151/1, and ERC LINASS 320503.This is the accepted manuscript version of the article. The final version is available from Wiley via http://dx.doi.org/10.1002/adom.20140033
Optical properties of gyroid structured materials: from photonic crystals to metamaterials

This is the accepted manuscript. The final version is available from Wiley at http://onlinelibrary.wiley.com/doi/10.1002/adom.201400333/abstract.The gyroid is a continuous and triply periodic cubic morphology which
possesses a constant mean curvature surface across a range of volumetric fill fractions.
Found in a variety of natural and synthetic systems which form through self-assembly,
from butterfly wing scales to block copolymers, the gyroid also exhibits an inherent
chirality not observed in any other similar morphologies. These unique geometrical
properties impart to gyroid structured materials a host of interesting optical properties.
Depending on the length scale on which the constituent materials are organised,
these properties arise from starkly different physical mechanisms (such as a complete
photonic band gap for photonic crystals and a greatly depressed plasma frequency
for optical metamaterials). This article reviews the theoretical predictions and
experimental observations of the optical properties of two fundamental classes of gyroid
structured materials: photonic crystals (wavelength scale) and metamaterials (subwavelength
scale).This work was supported by the EPSRC through the Cambridge
NanoDTC EP/G037221/1, EP/G060649/1, EP/L027151/1, and ERC LINASS 320503
Fluorescent red-emitting BODIPY oligofluorene star-shaped molecules as a color converter material for visible light communications

The authors thank EPSRC for fi nancial support from the UP-VLC project grant (EP/K00042X/1). P.J.S. and I.D.W.S. also acknowledge a Royal Society Wolfson Research Merit Award.Star-shaped organic semiconductors with boron dipyrromethene (BODIPY) cores are color-conversion materials for blue LED-based visible light communications. The difference between 0 and 1 bits is resolved in colour-converted data links at 100 Mb s−1. The BODIPY modulation bandwidth is eight times higher than that measured using conventional phosphor color converters.Publisher PDFPeer reviewe
SERS-Enabled Lab-on-a-Chip Systems

Surface-enhanced Raman spectroscopy (SERS) has been combined with microfluidic Lab-on-a-Chip (LoC) systems for sensitive optofluidic detection for more than a decade. However, most microfluidic SERS devices still suffer from analyte contamination and signal irreproducibility. In recent years, both the microfluidics and SERS communities have developed their own solutions that are complementary to each other; their combination even has potential for commercialization. In this review, the recent advances in both fields are summarized with regard to the development of reliable multifunctional SERS-enabled LoC systems and their broad applications. Starting from SERS fundamentals, reproducible SERS substrates and dynamic microfluidic trapping are discussed. Based on their combination, on-chip applications beyond SERS are presented, and insight can be gained into the commercialization of portable SERS chips.postprin
Curvature-driven, One-step Assembly of Reconfigurable Smectic Liquid
  Crystal "Compound Eye" Lenses

Confined smectic A liquid crystals (SmA LCs) form topological defects called
focal conic domains (FCDs) that focus light as gradient-index lenses. Here, we
exploit surface curvature to self-assemble FCDs in a single step into a
hierarchical structure (coined "flower pattern") molded by the fluid interface
that is pinned at the top of a micropillar. The structure resembles the
compound eyes of some invertebrates, which consist of hundreds of microlenses
on a curved interface, able to focus and construct images in three dimensions.
Here we demonstrate that these flowers are indeed "compound eyes" with
important features which have not been demonstrated previously in the
literature. The eccentric FCDs gradually change in size with radial distance
from the edge of the micropillar, resulting in a variable microlens focal
length that ranges from a few microns to a few tens of microns within a single
"flower". We show that the microlenses can construct a composite 3D image from
different depth of field. Moreover, the smectic "compound eye" can be
reconfigured by heating and cooling at the LC phase transition temperature; its
field of view can be manipulated by tuning the curvature of the LC interface,
and the lenses are sensitive to light polarization.Comment: 17 pages, 9 figures (4 supplementary), 3 supplementary movies. This
  is the pre-peer reviewed version of the article which has been published in
  its final form in Advanced Optical Materials and is available at
  http://onlinelibrary.wiley.com/doi/10.1002/adom.201500153/abstrac
Rational design of TADF polymers using a donor–acceptor monomer with enhanced TADF efficiency induced by the energy alignment of charge transfer and local triplet excited states.

The photophysics of thermally activated delayed fluorescence (TADF) in phenothiazine-dibenzothiophene-S,S-dioxide (PTZ-DBTO2) molecule is investigated in detail. First, it is shown that the proximity of local triplet excited states (3LE), e.g., 3D or 3A, above or below the DA charge transfer states (CT) is crucial for the efficiency of the TADF mechanism in PTZ-DBTO2. This TADF emitter is then used as a monomer unit to design polymer materials with efficient TADF. The reverse intersystem crossing mechanism (RISC) that supports TADF is able to compete with internal conversion and triplet–triplet annihilation (TTA) in the polymer chains and generates efficient TADF emission in the polymer pristine films. Prototype devices with PTZ-DBTO2 dispersed in 4,4′-bis(N-carbazolyl)-2,2′-biphenyl (CBP) host give excellent performance with EQE of ≈22% at low luminance (<100 cd m−2), for 100 cd m−2 the EQE is 19.4%. In the case of solution processed devices, using the novel TADF polymers, the performance is much lower, EQE ≈3.5% at 100 cd m−2, which is still the highest value for a polymer TADF system at useful brightness, yet reported. This results from a combination of weak charge transport properties in these materials and device fabrication methods that require further improvement. Nevertheless, these results pave the way to explore TADF in polymer light emitting diodes (PLEDs), using less costly deposition methods, such as spin-coating and inkjet printing, which are more appropriate for large area deposition
Monolayer Molybdenum Disulfide Nanoribbons with High Optical Anisotropy

Two-dimensional Molybdenum Disulfide (MoS2) has shown promising prospects for
the next generation electronics and optoelectronics devices. The monolayer MoS2
can be patterned into quasi-one-dimensional anisotropic MoS2 nanoribbons
(MNRs), in which theoretical calculations have predicted novel properties.
However, little work has been carried out in the experimental exploration of
MNRs with a width of less than 20 nm where the geometrical confinement can lead
to interesting phenomenon. Here, we prepared MNRs with width between 5 nm to 15
nm by direct helium ion beam milling. High optical anisotropy of these MNRs is
revealed by the systematic study of optical contrast and Raman spectroscopy.
The Raman modes in MNRs show strong polarization dependence. Besides that the
E' and A'1 peaks are broadened by the phonon-confinement effect, the modes
corresponding to singularities of vibrational density of states are activated
by edges. The peculiar polarization behavior of Raman modes can be explained by
the anisotropy of light absorption in MNRs, which is evidenced by the polarized
optical contrast. The study opens the possibility to explore
quasione-dimensional materials with high optical anisotropy from isotropic 2D
family of transition metal dichalcogenides
Neodymium-Based Stoichiometric Ultrasmall Nanoparticles for Multifunctional Deep-Tissue Photothermal Therapy

Nanoparticle-mediated photothermal therapy (NP-PTT) constitutes a flexible, highly selective, cost effective, and accurate tool for cancer treatment alone or in combination with other therapies such as radiotherapy or chemotherapy. The future application of NP-PTT in real life mainly depends on the design and synthesis of novel multifunctional nanoparticles that could overcome the current limitations of NP-PTT such as limited penetration depth and absence of therapy control. In this work, ultrasmall (≈2.4 nm) NdVO4 stoichiometric (100% constituent Nd3+ ions) nanoparticles are reported, which are capable of in vivo sub-tissue localized heating under 808 nm optical excitation while providing, simultaneously, the possibility of high penetration near-infrared fluorescence imaging. Ultrasmall stoichiometric NdVO4nanoparticles have evidenced a superior light-to-heat conversion efficiency. This is explained in terms of their large absorption cross-section at 808 nm (consequence of the particular spectroscopic properties of neodymium ions in NdVO4 and of the high neodymium content) as well as to their ultrasmall size that leads to large nonradiative decay rates. Results included in this work introduce ultrasmall, NdVO4 stoichiometric nanoparticles to the scientific community as multifunctional photothermal agents that could be considered as an alternative to traditional systems such as metallic, organic, or carbon-based nanoparticlesThis project has been supported by the Spanish Ministerio de Economía y Competitividad under project and MAT2013-47395-C4-1-R. B. del Rosal thanks Universidad Autónoma de Madrid for an FPI grant. Dragana Jovanović and Miroslav Dramićanin acknowledge financial support of the Ministry of Education, Science and Technological development of the Republic of Serbia (grant number 45020). Goran Dražić acknowledges the financial support of the Slovenian Research Agency (ARRS) through program no. P2-0148 and project J2-6754. Authors thanks COST action CM140
Nanoscale precision of 3D polymerisation via polarisation control

A systematic analysis of polarization effects in a direct write femtosecond
laser 3D lithography is presented. It is newly shown that coupling between
linear polarization of the writing light electric field and temperature
gradient can be used to fine-tune feature sizes in structuring of photoresists
at a nanoscale. The vectorial Debye focusing is used to simulate polarization
effects and a controlled variation up to 20% in the linewidth is shown
experimentally for the identical axial extent of the polymerised features. The
revealed mechanisms are relevant for a wide range of phenomena of light-matter
interaction at tight focusing in laser-tweezers and in plasmonic or dielectric
sub-wavelength focusing where strong light intensity and thermal gradients
coexist.Comment: 15 pages, 3 figure