Volume 10, Issue 17
September 5, 2022
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Bioinspired Anti-Fogging and Anti-Fouling Artificial Compound Eyes (Advanced Optical Materials 17/2022)
Minjing Li, Tongzhen Yang, Qing Yang, Zheng Fang, Hao Bian, Chengjun Zhang, Xun Hou, Feng Chen
2270065 First Published: 05 September 2022
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A bioinspired artificial compound eye (ACE) is fabricated by femtosecond laser wet etching, soft lithography, and polydimethylsiloxane (PDMS) swelling methods. The resultant ACE sample is close-packed with more than 3000 high-quality microlenses on a spherical macrolens over its large viewing angle. The trapped silicone oil in the PDMS endows the device with excellent water repellence and anti-fogging ability besides its high optical performance. Such remarkable characteristics make the minimized component competitive in vision systems under humid environment conditions. For further details see article number 2200861 by Qing Yang, Feng Chen and co-workers.

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Low-Cost Volumetric 3D Printing of High-Precision Miniature Lenses in Seconds (Advanced Optical Materials 17/2022)
Ya Xu, Peng Huang, Suet To, Li-Min Zhu, Zhiwei Zhu
2270066 First Published: 05 September 2022
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Targeting the fast prototyping and massive production of complicated lenses, Zhiwei Zhu and co-workers report a low-cost volumetric 3D printing method for the ultra-fast and high-precision fabrication of miniature lenses with sub-nanometric roughness (see article number 2200488). The complex-shaped lenses are generated by the volumetric projection stereolithography and corrected by introducing an iterative learning scheme. Super-smooth surfaces are guaranteed by the meniscus equilibrium effect.

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Kerker Condition for Enhancing Emission Rate and Directivity of Single Emitter Coupled to Dielectric Metasurfaces (Advanced Optical Materials 17/2022)
Megha Khokhar, Faraz A. Inam, Rajesh V. Nair
2270068 First Published: 05 September 2022
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A quantum metasurface is integrated with a single quantum emitter utilizing Kerker condition to modulate the emission pattern both spectrally and spatially (see article number 2200978 by Megha Khokhar, Faraz A. Inam, and Rajesh V. Nair). A large enhancement of 400 times in the emission decay rate is achieved at the NV-center zero phonon line wavelength of 640 nm with superior emission directionality. These findings open the door for manipulating single photon emission for applications in quantum photonics, sensing, imaging, and many-body interactions.

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Fine-Tuning Single-Source White-Light Emission from All-Inorganic Corrugated 2D Antimony-Halide Perovskite (Advanced Optical Materials 17/2022)
Fei Xu, Xiang Wang, Yue Li, Beng Jiang, Zuoru Dong, Zichen Yang, Jiaxing Kang, Xin Shu, Zuimin Jiang, Feng Hong, Run Xu, Zhongquan Ma, Teng Chen, Zhan Xu, Haitao Xu
2270069 First Published: 05 September 2022
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Corrugated 2D antimony-halide perovskites such as Cs3Sb2Cl9 (CSC) are promising candidates for single-source white-light emission due to their ultra-broadband spectra. However, CSC has a serious luminescence quenching phenomenon due to inadequate confinement of excitons. In article number 2200930, Fei Xu, Xiang Wang, Feng Hong and co-workers report the homovalent substitution strategy of Sb by a small amount of rare earth cations in CSC to realize intense ultra-broadband spectra covering the visible light region at room temperature, resulting from self-trapping exciton emission, which could be considered to be attributed to high activation energy, type-I-like “straddling” band alignment, and strong electron–phonon interaction effect.

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Masthead: (Advanced Optical Materials 17/2022)
2270067 First Published: 05 September 2022
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Reviews
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Microstructure Engineering of Hexagonal Boron Nitride for Single-Photon Emitter Applications
Chao Zhang, Zhiyuan Shi, Tianru Wu, Xiaoming Xie
2200207 First Published: 12 June 2022
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This review emphasizes the microstructures of h-BN and their single-photon emitters (SPEs) characteristics. And recent progress in the synthesis of h-BN films, some approaches for achieving SPE arrays, and the applications of h-BN SPEs are introduced. The success in the preparation of large-scale h-BN and its microstructural engineering provides a promising future in low-dimensional quantum optics.

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Research Articles
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The Distribution and Evolution of Refractive Index in a Polystyrene Whispering Gallery Microcavity during Glass Transition
Yuxin Zhan, Feiyang Hou, Shengfei Feng, Xinke Wang, Wenfeng Sun, Jiasheng Ye, Yan Zhang
2102548 First Published: 16 June 2022
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The differences in the wavelength shifts between whispering gallery modes with different radial orders are employed to detect the evolution of the refractive index inside a polystyrene microsphere during the glass transition. The expression of the refractive index as a function of depth and temperature is achieved. These results can assist with the sensing applications of whispering gallery microcavities.

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Defect-Engineered Magnetic Field Dependent Optoelectronics of Vanadium Doped Tungsten Diselenide Monolayers
Katharina Nisi, Jonas Kiemle, Lukas Powalla, Alessio Scavuzzo, Tuan Dung Nguyen, Takashi Taniguchi, Kenji Watanabe, Dinh Loc Duong, Marko Burghard, Alexander W. Holleitner, Christoph Kastl
2102711 First Published: 15 June 2022
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Substitutionally doped V-WSe2 monolayers are investigated using low-temperature luminescence and optoelectronic spectroscopy. V-dopants lead to a p-type doping character and an impurity-related emission 160 meV below the neutral exciton. The doped monolayers display a magnetic hysteresis in transport measurements under illumination and without illumination, whereas the valley polarization of the excitons reveals a nonlinear g-factor without a magnetic hysteresis.

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Self-Trapped and Free Exciton Dynamics in Vacuum-Deposited Cesium Copper Iodide Thin Films
Chien-Yu Chen, Yung-I Lin, Po-Ting Lai, Hao-Cheng Lin, Guang-Hsun Tan, Hao-Wu Lin, Richard D. Schaller
2200005 First Published: 15 June 2022
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CsCu2I3 and Cs3Cu2I5 exhibiting self-trapped exciton emission are attractive for light-emitting applications. Carrier dynamics of these vapor deposited materials are examined by transient absorption and streak camera measurements. CsCu2I3 exhibits free exciton emission and noticeable changes in width and position of self-trapped exciton emission in the streak camera results which are not observed in Cs3Cu2I5.

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Highly Scalable, Wearable Surface-Enhanced Raman Spectroscopy
Limei Liu, Pablo Martinez Pancorbo, Ting-Hui Xiao, Saya Noguchi, Machiko Marumi, Hiroki Segawa, Siddhant Karhadkar, Julia Gala de Pablo, Kotaro Hiramatsu, Yasutaka Kitahama, Tamitake Itoh, Junle Qu, Kuniharu Takei, Keisuke Goda
2200054 First Published: 22 June 2022
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Highly scalable, wearable surface-enhanced Raman spectroscopy based on an easy-to-fabricate, low-cost, ultrathin, flexible, stretchable, adhesive, and biointegratable gold nanomesh is demonstrated in this study. It can be fabricated in any shape and worn on virtually any surface for label-free, large-scale, in situ sensing of diverse analytes from low to high concentrations.

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Exciton Diffusion and Annihilation in Nanophotonic Purcell Landscapes
T. V. Raziman, C. Peter Visser, Shaojun Wang, Jaime Gómez Rivas, Alberto G. Curto
2200103 First Published: 07 June 2022
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Light emission in 2D semiconductors, perovskites, and molecular crystals is due to excitons. It is possible to tailor nanophotonic structures to maximize emission. Conventional nanophotonic design treats nanoscale light sources as fixed in space and non-interacting. However, excitons spread and annihilate. This work explores the interplay of excitonic and nanophotonic properties beyond the classical Purcell effect for efficient light-emitting devices.

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High Performance NIR OLEDs with Emission Peak Beyond 760 nm and Maximum EQE of 6.39%
Hongyang Zhang, Zhao Chen, Longzhi Zhu, Yongquan Wu, Yuqing Xu, Shuming Chen, Wai-Yeung Wong
2200111 First Published: 15 June 2022
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By functionalizing the isoquinolyl and thienyl units of cyclometalated ligands, the newly designed Ir(III) emitters afford the champion efficiency in the Ir(III)-based OLEDs with the electroluminescent peak exceeding 760 nm.

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Macrocyclic Confined Purely Organic Room-Temperature Phosphorescence Three-Photon Targeted Imaging
Fang-Fang Shen, Zhixue Liu, Hua-Jiang Yu, Haoran Wang, Xiufang Xu, Yu Liu
2200245 First Published: 26 June 2022
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A supramolecular assembly emitting three-photon room-temperature phosphorescence (RTP) was constructed from cucurbit[8]uril-confined alkyl-chain-modified 4-bromophenyl pyridine salts and sulfonated β-cyclodextrin, which coassembled with Nile blue to emit near-infrared (NIR)-delayed fluorescence. The multilevel supramolecular assembly can be used for three-photon-excited NIR-delayed fluorescence and RTP-targeted imaging of cancer cells.

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Optical Magnetism-Induced Dual Anisotropy in Dielectric Nanoantennas
Weiwei Fu, Dong Zhao, Ziqin Li, Kun Huang
2200303 First Published: 06 June 2022
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The co-existence of both amplitude- and phase-type anisotropies in artificial dielectric rectangle nanoantennas has been unveiled with optically induced magnetic resonances to demonstrate a polarization-dependent color-printed hologram for optical anticounterfeiting.

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Ultrastable 0D Organic Zinc Halides with Highly Efficient Blue Light Emissions
Yue-Yue Ma, Yu-Ming Sun, Wen-Jie Xu, Xue-Lei Liu, Qian-Qian Zhong, Ying-Rui Song, Han-Qi Fu, Cheng-Yang Yue, Xiao-Wu Lei
2200386 First Published: 05 June 2022
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Ultrastable blue emitting 0D zinc halides are a new family of 0D hybrid zinc halides displaying highly efficient blue light emissions with highest photoluminescence quantum yield of 35.47%. These 0D zinc halides exhibit extraordinary high chemical stabilities in water and extreme pH conditions (0–14), which are nearly unmatchable among all known literature perovskite materials to the best of the authors’ knowledge.

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Controllable Perovskite Single Crystal Heterojunction for Stable Self-Powered Photo-Imaging and X-Ray Detection
Jun Yan, Feng Gao, Yongzhi Tian, Yan Li, Weiqiang Gong, Shuangpeng Wang, Hai Zhu, Lin Li
2200449 First Published: 26 June 2022
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A facile solution epitaxial growth method is developed for controllably growing perovskite single-crystal pn heterojunction with a well-defined interface and high crystalline quality. Benefiting from excellent built-in electrical potential at pn heterojunction, the heterojunction detector shows obvious rectification behavior and high performance in both photodetection and X-ray detection without any external power supply.

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Wafer-Scale 200 mm Metal Oxide Infrared Metasurface with Tailored Differential Emissivity Response in the Atmospheric Windows
Kai Sun, Evangelos Vassos, Xingzhao Yan, Callum Wheeler, James Churm, Peter R. Wiecha, Simon A. Gregory, Alex Feresidis, Cornelis H. de Groot, Otto L. Muskens
2200452 First Published: 19 June 2022
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The authors demonstrate the fabrication over 200 mm wafer scale of a uniformly patterned metasurface for dual-band control of the reflectivity in the mid-wave and long-wave infrared. The metasurface stack design provides independent control over the reflectivity in the two bands with a flat spectral profile.

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Highly Efficient Filterless Bilateral Majority Carrier-Type Color Photodetectors
Yeonsoo Cho, Hyunah Kim, Jaewu Choi
2200454 First Published: 16 June 2022
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This study demonstrates an efficient method for graphene–insulator–silicon-on-insulator–insulator–graphene-coupled back-to-back Schottky junctions to amplify the photoresponsivity of majority carrier-type photodetectors based on silicon surface passivation for identifying the color of illuminating light using a thin silicon layer with distinct interfaces instead of color filters.

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Low-Cost Volumetric 3D Printing of High-Precision Miniature Lenses in Seconds
Ya Xu, Peng Huang, Suet To, Li-Min Zhu, Zhiwei Zhu
2200488 First Published: 03 June 2022
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A low-cost volumetric 3D printing method is developed for the ultra-fast and high-precision fabrication of miniature lenses with sub-nanometric roughness. In detail, the grayscale modulation-based volumetric projection stereolithography is developed for structure generation, which is then smoothened by the meniscus equilibrium effect. An iterative learning scheme further converges the fabricated form error to the micrometer scale.

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Stable Multi-Wavelength Lasing in Single Perovskite Quantum Dot Superlattice
Linqi Chen, Beier Zhou, Yingjie Hu, Hongxing Dong, Ge Zhang, Yifeng Shi, Long Zhang
2200494 First Published: 05 June 2022
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This work reports the achievement of stable multi-wavelength lasing in single perovskite quantum dot (QD) superlattice through anion exchange and clarifies the kinetics and the atomic-scale anion exchange mechanism in QD superlattice, which is responsible for the formation of stable bandgap gradient in the alloy superlattice. In addition, energy-transfer process in the alloy superlattice is revealed by carrier transportation dynamics.

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High-Performance Broadband Visible−Near Infrared Photodetector Enabled by Atomic Capping Layer
Yixuan Huang, Xiangyu Zhou, Lingzhi Luo, Jihua Zou, Hezhuang Liu, Xiao Li, Aobo Ren, Kai Shen, Jiang Wu
2200539 First Published: 12 June 2022
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A broadband molybdenum diselenide (MoSe2) phototransistor using oxygen modification strategy is demonstrated. A faster response speed, higher responsivity, larger detectivity (3.37 × 1014 Jones), better stability, and an extended near-infrared response (λ = 980 nm) are revealed. An accurate turbidity measurement is demonstrated in the turbidity sensing system based on the device, which is of much significance for practical applications.

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Enhancing and Extinguishing the Different Emission Features of 2D (EA1−xFAx)4Pb3Br10 Perovskite Films
Rhiannon M. Kennard, Clayton J. Dahlman, Emily E. Morgan, Juil Chung, Benjamin L. Cotts, Joseph R. A. Kincaid, Ryan A. DeCrescent, Kevin H. Stone, Shobhana Panuganti, Yahya Mohtashami, Lingling Mao, Richard D. Schaller, Alberto Salleo, Mercouri G. Kanatzidis, Jon A. Schuller, Ram Seshadri, Michael L. Chabinyc
2200547 First Published: 12 June 2022
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A method for extinguishing or enhancing different emission features is demonstrated for the family of 2D Ruddlesden–Popper perovskites (EA1−xFAx)4Pb3Br10 (EA = ethylammonium, FA = formamidinium). Incorporation of dimethylformamide in compositions with FA leads to removal of phonon-coupled emission and also to growth of large micron-sized domains in thin films.

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Control of Plexcitonic Strong Coupling via Substrate-Mediated Hotspot Nanoengineering
Xiao Xiong, Yiming Lai, Daniel Clarke, Nuttawut Kongsuwan, Zhaogang Dong, Ping Bai, Ching Eng Png, Lin Wu, Ortwin Hess
2200557 First Published: 30 June 2022
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For the canonical gold bowtie, a plasmonic antenna mode with elevated hotspot and in-plane polarized near-field can be achieved via a rational selection of the substrate. The extreme plasmon-mediated field confinement and enhancement of 500-fold facilitates ultrafast quantum dynamics with quantum emitters in the strong coupling regime, and is particularly appealing for applications related to 2D excitonic quantum materials.

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Tunable Infrared Sensing Properties of MXenes Enabled by Intercalants
Jun Tang, Hujie Wan, Libo Chang, Bihua Hu, Shuyu Cui, Yulong Chen, Wei Chen, Junjie Hao, Haodong Tang, Xingzhu Wang, Kai Wang, Chuanfang (John) Zhang, Qiye Wen, Xu Xiao, Baomin Xu
2200623 First Published: 06 June 2022
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Intercalants between the interlayer spacing of MXene nanosheets play an important role on determining the optoelectronic properties of MXenes. The intra-flake resistance of MXenes is intrinsically metallic which shows a positive temperature coefficient behavior under the irradiation of near-infrared laser, while the inter-flake resistance shows a negative temperature coefficient behavior. The interlayer chemistry of MXenes should be carefully designed for better optoelectronic performance.

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Blocking the Energy Loss of Dexter Energy Transfer in Hyperfluorescence OLEDs Via One-Step Phenyl-Fluorene Substitution of TADF Assistant Host
Wentao Xie, Xiaomeng Peng, Mengke Li, Weidong Qiu, Wei Li, Qing Gu, Yihang Jiao, Zijian Chen, Yiyang Gan, Kun kun Liu, Shi-Jian Su
2200665 First Published: 09 June 2022
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The triplet energy loss of Dexter energy transfer for red hyperfluorescence device was blocked through one-step substitution of thermally activated delayed fluorescence sensitizer by electronically inert phenyl-fluorene terminal, giving a proof-of-concept device with a maximum external quantum efficiency of 18.1% and Commission Internationale de L'Eclairage coordinates of (0.61, 0.38).

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