• Issue
    Volume 9, Issue 12
    June 18, 2021

Cover Picture

Free Access

Solar Pumping of Fiber Lasers with Solid-State Luminescent Concentrators: Design Optimization by Ray Tracing (Advanced Optical Materials 12/2021)

  • First Published: 18 June 2021
Description unavailable

In article number 2100479, Stephan Dottermusch, Ian A. Howard and co-workers use ray-tracing simulations to demonstrate how the performance of lightweight, scalable, solar-pumped lasers can be boosted by luminescent concentrators. Embedding the solar-pumped laser's fiber in an appropriately designed solid-state luminescent concentrator leads to significant enhancement of the output power compared with current designs also based on radiative energy transfer.

Inside Front Cover

Free Access

Direct Laser Writing for the Formation of Large-Scale Gold Microbumps Arrays Generating Hybrid Lattice Plasmon Polaritons in Vis–NIR Range (Advanced Optical Materials 12/2021)

  • First Published: 18 June 2021
Description unavailable

Evaldas Stankevicius and co-workers (article number 2100027) demonstrate the formation of large-scale gold microbump arrays generating hybrid lattice plasmon polaritons in the visible to near-infrared range using direct laser writing technique. The demonstrated method shows relevant technological progress in the formation of large-scale metallic gratings by using a cost-effective laser-based technique. It provides new opportunities for hybrid lattice plasmon polariton (HLPP)-based applications in biotechnology, photonics, and plasmonics.

Back Cover

Free Access

Optical and Structural Properties of Manganese-Doped Zinc Oxide Grown by Metal-Organic Chemical Vapor Deposition (Advanced Optical Materials 12/2021)

  • First Published: 18 June 2021
Description unavailable

Transition-metal doping in zinc oxide results in controllably tunable optical properties, while maintaining a high crystal quality, as shown in article number 2100096 by Na (Luna) Lu and co-workers. Mn-doping in ZnO by metal-organic chemical vapor deposition is an effective way to tune the absorption band-edges and photoluminescence intensities in the visible and ultraviolet regions. These findings open the doors to further investigate and apply ZnO-based materials for photovoltaic, light-emitting diode, laser, sensing, and other optoelectronic applications.

Masthead

Free Access

Masthead: (Advanced Optical Materials 12/2021)

  • First Published: 18 June 2021

Reviews

Light-Driven Carbon-Based Soft Materials: Principle, Robotization, and Application

  • First Published: 07 April 2021
Description unavailable

Recently, light-driven carbon-based actuators are widely applied in robotic applications due to their efficient, fast response, and stable actuating performance. This review summarizes the principle actuating mechanism of carbon-based actuators and focuses on the analysis of the robotization and application mechanisms. In addition, the challenges and perspectives of carbon-based actuators are discussed for their further development and robotic utilization.

Open Access

Recent Progress on Optoplasmonic Whispering-Gallery-Mode Microcavities

  • First Published: 07 April 2021
Description unavailable

The latest progress in optoplasmonic whispering-gallery-mode (WGM) microcavities is presented. Fundamentals and advances of optoplasmonic modes are discussed, including surface-plasmon-polariton WGMs, hybrid photon-plasmon WGMs, and heterostructured metal-dielectric WGMs. Coupling effects between localized surface plasmon resonances and WGMs are also reviewed. The optoplasmonic microcavities show great potential in constructing highly integrated nanophotonic circuits as sensors, lasers, waveguides, filters, and spectrometers.

Progresses on Novel B-Site Perovskite Nanocrystals

  • First Published: 07 April 2021
Description unavailable

Lead-free perovskites with various B-site candidates exhibit different crystal structures due to the discrepant ionic structures of these B-site elements. Most lead-free perovskite nanocrystals can be obtained by three bottom-up approaches: hot-injection, ligand-assisted re-precipitation, and recrystallization. Bandgap, photoluminescence, and stability are the most commonly studied properties which will lead to different applications such as solar cells, photodetectors, and luminescence devices.

Communications

Tuning the Magic Sizes and Optical Properties of Atomically Precise Bidentate N-Heterocyclic Carbene-Protected Gold Nanoclusters via Subtle Change of N-Substituents

  • First Published: 12 April 2021
Description unavailable

A new class of atomically precise gold nanoclusters, stabilized by bis-N-heterocyclic carbene ligands featuring different N4 substituents, have been realized via a straightforward “one-pot” strategy. The magic sizes and optical properties of the clusters can be easily tuned via a subtle change on N4 substituents, giving emissive Au13 clusters and non-emissive Au11 clusters. Experimental and theoretical investigations are employed to reveal the mechanism.

Origin of Intramolecular Low-Threshold Amplified Spontaneous Emission

  • First Published: 29 March 2021
Description unavailable

The intramolecular low-threshold amplified spontaneous emission (ASE) is highly correlated to the character of the lowest excited states. The pure local excited state favors ASE with discrete vibrational levels for efficient population inversion. The charge transfer state does not exibit ASE because its significant inter-fragment geometry change causes large vibronic coupling in the low-frequency region, difficult to form well-resolved vibrational energy levels.

Research Articles

Switching the Nonparametric Optical Nonlinearity of Tungsten Oxide by Electrical Modulation

  • First Published: 12 April 2021
Description unavailable

Electrochemical switching of the nonlinear absorption of tungsten oxide is demonstrated. A film of tungsten oxide exhibits saturable absorption or reverse saturable absorption under negative or positive voltage, respectively. The external voltage-dependent nonlinear optical response is correlated with variation in the band structure and its population.

InGaN Micro-LED Array Enabled Advanced Underwater Wireless Optical Communication and Underwater Charging

  • First Published: 12 April 2021
Description unavailable

In this study, multifunction micro-LED (light-emitting diode) array for light emission, optical detection, and photovoltaic power generation is fabricated and high-speed duplex underwater wireless optical communication (UWOC) system is demonstrated. In addition, a new underwater charging method using micro-LED is first reported. Such a micro-LED array can be used to realize a miniaturized and high-performance UWOC system.

Optogenetics-Inspired Neuromorphic Optoelectronic Synaptic Transistors with Optically Modulated Plasticity

  • First Published: 27 March 2021
Description unavailable

A neuromorphic optoelectronic synaptic transistor based on MoS2/QDs mixed-dimensional heterostructure exhibits optically modulated synaptic plasticity in an optogenetic way, where light signals control the switching characteristics of the MoS2/QDs channel and dominate the synaptic behavior under electrical stimulation. Such device operations can be used to emulate the neuronal signaling transmission in retina and promote the development of neuromorphic optoelectronics.

Ultrastable Perovskite Nanocrystals in All-Inorganic Transparent Matrix for High-Speed Underwater Wireless Optical Communication

  • First Published: 01 April 2021
Description unavailable

Extremely stable CsPbBr3 nanocrystals in glass show enhanced radiative transition rates due to the large refraction index of the glass matrix. The composite has demonstrated high bandwidth up to 180 MHz and data transmitting speed up to 185 Mbps as well as long-term water resistance for underwater wireless optical communication.

Direct Laser Writing for the Formation of Large-Scale Gold Microbumps Arrays Generating Hybrid Lattice Plasmon Polaritons in Vis–NIR Range

  • First Published: 23 April 2021
Description unavailable

The fabrication of large-scale gold microbumps arrays generating hybrid lattice plasmon polaritons (HLPP) in the Vis–NIR range using direct laser writing technique is presented. The demonstrated method shows relevant technological progress in the formation of large-scale metallic gratings by using a cost-effective laser-based technique. It provides new opportunities for HLPP-based applications in biotechnology, photonics, and plasmonics.

Hydrogen-Bond-Induced High Performance Semitransparent Ternary Organic Solar Cells with 14% Efficiency and Enhanced Stability

  • First Published: 12 April 2021
Description unavailable

In this paper, the hydrogen-bond strategy is used to realize high-performance ternary organic solar cells with good film thickness tolerance. Based on the PM6:Y6:10% DIBC system, the semitransparent device with Au (10 nm)/Ag (20 nm) electrode achieves 14% power conversion efficiency and 21.6% average visible-light transmittance, which is one of the best semitransparent devices currently.

Fast and High-Resolution Ultrasound Pressure Field Mapping Using Luminescent Membranes

  • First Published: 31 March 2021
Description unavailable

Acoustically produced luminescence (APL) employs a specially designed luminescent membrane to convert ultrasound pressure into visible light, producing cross sectional views of the acoustic beam many times faster than conventional hydrophone scanning. This paper demonstrates the ultrasonic heating mechanism behind the light generation, as well as the easy calibration, frequency dependency, and good spatial resolution of the APL method.

Electrophoretic Plasmonic Ink for Dynamic Color Display

  • First Published: 12 April 2021
Description unavailable

Electrical plasmonic display is achieved by reconfigurable electrophoretic movement control of noble metal nanocrystals in an organic electrolyte solvent. The noble metal nanocrystals serve as advantageous nanoscale colorful pigments with long-term durability and mass production compatibility when their surfaces are modified by a hydrophobic coating. The technique is highly valuable in developing plasmonic electronic paper in full color.

Optical and Structural Properties of Manganese-Doped Zinc Oxide Grown by Metal-Organic Chemical Vapor Deposition

  • First Published: 22 April 2021
Description unavailable

Mn-doped zinc oxide (ZnMnO) grown by metal-organic chemical vapor deposition exhibits simultaneously tunable UV and green emissions with Mn-doping. Mn incorporation also reduces the absorption band-edge of zinc oxide (ZnO) toward the visible region. Such a tunability in optical properties with transition metal doping will enable advancing ZnO materials for photovoltaic, light emitting diode, and photodetector applications.

Hyperspectral Imaging and Optical Trapping: Complementary Tools for Assessing Direction-Dependent Polarized Emission from Single Upconverting LiYF4:Yb3+/Er3+ Microparticles

  • First Published: 07 April 2021
Description unavailable

Hyperspectral imaging and optical trapping are highly synergistic tools to assess photoluminescence at a single-particle level. In this work, optical trapping and single-particle polarized emission spectroscopy are leveraged to demonstrate that direction-dependent polarized emission is a likely source of the spatial emission intensity variation exhibited by upconverting LiYF4:Yb3+/Er3+ microparticles during hyperspectral imaging.

Light-Responsive Circularly Polarized Luminescence Polymers with INHIBIT Logic Function

  • First Published: 02 April 2021
Description unavailable

The light-responsive and luminescence-tunable circularly polarized luminescence (CPL)-active materials are synthesized by mixing achiral helical polymer containing vibration-induced emission molecules and spiropyran with a chiral helical polymer. Based on the dynamic Förster resonance energy transfer, the multistimulus responsive CPL can serve as the output signal to construct an “INHIBIT” logic gate.

Tailoring Circular Dichroism for Simultaneous Control of Amplitude and Phase via Ohmic Dissipation Metasurface

  • First Published: 16 April 2021
Description unavailable

A paradigm of chiral metasurface is proposed to achieve simultaneous control of reflective amplitude and phase. As two proofs-of-principle, two kinds of metasurfaces for rectangular-shaped beam reflection and complex-amplitude hologram are designed, fabricated, and measured. Encouragingly, this work may pave a new route in the fields of beam-forming technology and spin-selective integrated systems.

Engineering Chemical Vapor Deposition for Lead-Free Perovskite-Inspired MA3Bi2I9 Self-Powered Photodetectors with High Performance and Stability

  • First Published: 18 May 2021
Description unavailable

Lead-free perovskite-inspired MA3Bi2I9 (MBI) films deposited via chemical vapor deposition (CVD) featuring a modified source vapor delivery system (2T-CVD) have smooth and compact morphology. Photodetectors based on such films can operate in self-powered mode with cutting-edge performance and stability, having a responsivity as high as 0.28 A W−1 and a specific detectivity up to 8.8 × 1012 Jones.

Self-Assembled Ag2S-QD Vesicles for In Situ Responsive NIR-II Fluorescence Imaging-Guided Photothermal Cancer Therapy

  • First Published: 17 April 2021
Description unavailable

A kind of self-assembled Ag2S-quantum dot vesicle with interesting features, including specific stimulation-activated second near infrared (NIR-II) fluorescence and enhanced photothermal conversion efficiency is developed, which can be successfully applied to the in situ pH-activated NIR-II fluorescence imaging guided NIR-II photothermal therapy. This work provides a new insight on the effective design of specific stimulation-responsive nanoprobes for targeting cancer theranostics.

Open Access

Single-Mode, 700%-Stretchable, Elastic Optical Fibers Made of Thermoplastic Elastomers

  • First Published: 04 May 2021
Description unavailable

Small-core super-elastic optical fibers are realized by thermal drawing of core-clad fiber preforms made from transparent thermoplastic elastomers. Such fibers can guide single-mode light and their optical properties depend on the fiber strain. Furthermore, a new composite fiber by combining the favorable properties of thermoset and thermoplastic stretchy polymers is presented.

Stretchable, Transparent, Permeation Barrier Layer for Flexible Optics

  • First Published: 12 April 2021
Description unavailable

A flexible and transparent permeation barrier layer is prepared by initiated chemical vapor deposition. The coating is a highly crosslinked fluoropolymer transparent to light from 300 to 1690 nm wavelength. It can accommodate deformation of a flexible substrate while maintaining its barrier performance, which should make it an appealing barrier layer for flexible optics.

Direct Growth of Hexagonal Boron Nitride Thick Films on Dielectric Substrates by Ion Beam Assisted Deposition for Deep-UV Photodetectors

  • First Published: 14 April 2021
Description unavailable

The deep-ultraviolet (DUV) photodetectors based on hexagonal boron nitride (h-BN) thick films synthesized by ion beam assisted deposition achieve high response at 204 nm with a cutoff of 218 nm. The results demonstrate that nanocrystalline h-BN thick films directly grown on dielectric substrates are promising for fabricating high-performance photodetector devices capable of operation in solar-blind DUV region.

Nonlinear Optical Thermometry—A Novel Temperature Sensing Strategy via Second Harmonic Generation (SHG) and Upconversion Luminescence in BaTiO3:Ho3+,Yb3+ Perovskite

  • First Published: 16 April 2021
Description unavailable

A novel strategy of nonlinear optical thermometry is presented for the first time. The temperature sensing concept is based on the nonlinear processes of second harmonic generation (SHG) and upconversion luminescence, observed in BaTiO3 perovskite particles. This highly sensitive method exploits a new and effective pathway for contactless temperature sensing, which is a promising alternative method to conventional fluorescence/luminescence intensity ratio (FIR/LIR) thermometry.

Tailoring the Broadband Emission in All-Inorganic Lead-Free 0D In-Based Halides through Sb3+ Doping

  • First Published: 01 April 2021
Description unavailable

A strategy of Sb3+ doping is proposed for fine-tuning the optical properties of 0D In-based halides and the excited-state dynamics of Sb3+ is unraveled through temperature-dependent PL and femtosecond transient absorption spectroscopies. Through the control of monovalent cation and the octahedral unit, tunable Sb3+ emissions (490−750 nm) with quantum yields up to 91.8% are achieved in these 0D In-based halides.

Open Access

Solar Pumping of Fiber Lasers with Solid-State Luminescent Concentrators: Design Optimization by Ray Tracing

  • First Published: 06 May 2021
Description unavailable

Ray-tracing simulations demonstrate that the performance of solar-pumped lasers (SPLs), based on solid-state luminescent concentrators, should significantly exceed the best experimental results achieved for fiber-based SPLs pumped by liquid-state luminescent concentrators. Embedding a fiber of optimized length into a specially designed solid-state luminescent concentrator is a promising route for producing scalable SPLs.