Advanced Optical Materials

Cover image for Vol. 5 Issue 3

February 2, 2017

Volume 5, Issue 3

  1. Cover Picture

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    7. Reviews
    8. Communications
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      Antireflective Films: Super-Antireflective Structure Films with Precisely Controlled Refractive Index Profile (Advanced Optical Materials 3/2017)

      Kiwoon Choi, Youngwoon Yoon, Jaehoon Jung, Chi Won Ahn, Gil Ju Lee, Young Min Song, Min Jae Ko, Han Sup Lee, BongSoo Kim and Il-Suk Kang

      Version of Record online: 2 FEB 2017 | DOI: 10.1002/adom.201770014

      Thumbnail image of graphical abstract

      In article number 1600616, the fabrication of superantireflective structure films is presented, which exhibit an unprecedented refractive index profile and eliminate reflections almost completely for any angle of incidence with extreme precision using a newly developed square voltage pulse anodization. The application of the films developed by BongSoo Kim, Il-Suk Kang, and co-workers on polymer solar cells demonstrates that the efficiencies of the film increase to 12.08% at 70°.

  2. Inside Front Cover

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      Label-Free Sensing: Extraordinary Figure-of-Merit of Magnetic Resonance from Ultrathin Silicon Nanohole Membrane as All-Dielectric Metamaterial (Advanced Optical Materials 3/2017)

      Sang-Gil Park, Youngseop Lee, Seyong Kwon, SeokJae Yoo, Q-Han Park, Je-Kyun Park and Ki-Hun Jeong

      Version of Record online: 2 FEB 2017 | DOI: 10.1002/adom.201770015

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      Ki-Hun Jeong and co-workers successfully demonstrate a silicon nanohole metamaterial with ultrathin membrane configuration for an extraordinary figure-of-merit in article number 1600628. This novel metamaterial enables not only the label-free detection of chemical and biological molecules with different mass concentrations but also the in situ reaction monitoring of biochemical molecules. The image shows the label-free detection of streptavidin and biotin binding by using the ultrathin silicon nanohole membrane.

  3. Back Cover

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      Two-Photon Lasers: Perovskite CsPb2Br5 Microplate Laser with Enhanced Stability and Tunable Properties (Advanced Optical Materials 3/2017)

      Xiaosheng Tang, Zhiping Hu, Wei Yuan, Wei Hu, Haibing Shao, Dongjia Han, Junfeng Zheng, Jiongyue Hao, Zhigang Zang, Juan Du, Yuxin Leng, Liang Fang and Miao Zhou

      Version of Record online: 2 FEB 2017 | DOI: 10.1002/adom.201770019

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      A novel all-inorganic perovskite CsPb2Br5 microplate with superior crystallinity, enhanced stability, and tunable optical properties is reported by combining experimental and theoretical studies. The microplate developed in article number 1600788 by Juan Du, Miao Zhou, and co-workers exhibits surprisingly low-threshold amplified spontaneous emission under both one- and two-photon excitation, which is related to its unique spatially distinguished valence/conduction band edge states originating from the intrinsic sandwiched structure.

  4. Masthead

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      Masthead: (Advanced Optical Materials 3/2017)

      Version of Record online: 2 FEB 2017 | DOI: 10.1002/adom.201770018

  5. Contents

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      Contents: (Advanced Optical Materials 3/2017)

      Version of Record online: 2 FEB 2017 | DOI: 10.1002/adom.201770016

  6. Reviews

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    1. Conducting Polymers as Anode Buffer Materials in Organic and Perovskite Optoelectronics

      Soyeong Ahn, Su-Hun Jeong, Tae-Hee Han and Tae-Woo Lee

      Version of Record online: 9 NOV 2016 | DOI: 10.1002/adom.201600512

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      Conducting polymers are widely used as an anode buffer layer for organic and organic–inorganic hybrid perovskite (OIHP) optoelectronics. Engineering of various materials is reviewed and discussed to overcome limitations of conventional conducting polymers, and their applications as a conducting polymer-based anode buffer layer in organic and OIHP light-emitting diodes and solar cells.

  7. Communications

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    1. Super-Antireflective Structure Films with Precisely Controlled Refractive Index Profile

      Kiwoon Choi, Youngwoon Yoon, Jaehoon Jung, Chi Won Ahn, Gil Ju Lee, Young Min Song, Min Jae Ko, Han Sup Lee, BongSoo Kim and Il-Suk Kang

      Version of Record online: 7 NOV 2016 | DOI: 10.1002/adom.201600616

      Thumbnail image of graphical abstract

      The fabrication of super-antireflective structure films is reported, which exhibit an unprecedented refractive index profile and eliminate reflections almost completely for any angle of incidence with extreme precision using a newly developed square voltage pulse anodization. The application of the films on polymer solar cells demonstrates that the efficiencies with the film increase to 12.08% at 70°.

    2. Visible Range Plasmonic Modes on Topological Insulator Nanostructures

      Alexander M. Dubrovkin, Giorgio Adamo, Jun Yin, Lan Wang, Cesare Soci, Qi Jie Wang and Nikolay I. Zheludev

      Version of Record online: 9 NOV 2016 | DOI: 10.1002/adom.201600768

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      Phase-resolved real-space imaging of localized plasmons in Bi1.5Sb0.5Te1.8Se1.2 topological insulator nanostructures is performed by scattering-type scanning near-field optical microscopy. Dipolar and higher order surface plasmon modes with well-defined field amplitude and phase profiles are detected in the visible part of the spectrum.

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      Toward Direct Laser Writing of Actively Tuneable 3D Photonic Crystals

      Yaoyang Hu, Benjamin T. Miles, Ying-Lung D. Ho, Mike P. C. Taverne, Lifeng Chen, Henkjan Gersen, John G. Rarity and Charl F. J. Faul

      Version of Record online: 10 NOV 2016 | DOI: 10.1002/adom.201600458

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      3D printing and actively switchable redox-active oligo(aniline)-based materials are combined to create novel tuneable 3D photonic materials. By a direct laser writing process, switchable functional structures with submicrometer features are fabricated. Reversible changes in the refractive index of the written materials are generated with negligible size changes.

    4. Programmable Microfluidic Synthesis of Over One Thousand Uniquely Identifiable Spectral Codes

      Huy Q. Nguyen, Brian C. Baxter, Kara Brower, Camilo A. Diaz-Botia, Joseph L. DeRisi, Polly M. Fordyce and Kurt S. Thorn

      Version of Record online: 18 OCT 2016 | DOI: 10.1002/adom.201600548

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      The ability to produce and distinguish microparticles containing >1100 spectral codes via the ratiometric incorporation of lanthanide nanophosphors is demonstrated. It is shown that 98% of these microparticles, which are termed MRBLEs (microspheres with ratiometric barcode lanthanide encoding), can be assigned to a code with >99.99% confidence, representing the largest purely spectral code set produced to date.

    5. Polarized Band-Edge Emission and Dichroic Optical Behavior in Thin Multilayer GeS

      Ching-Hwa Ho and Jia-Xuan Li

      Version of Record online: 25 NOV 2016 | DOI: 10.1002/adom.201600814

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      Dichroic band-edge emission of a GeS multilayer is characterized by using polarized photoluminescence measurements with polarization angles ranging from E||b (θ = 0°) to E⊥b (E||a, θ = 90°). The band-edge emission at ca. 1.622 eV clearly shows sinusoidal variation of light intensity with respect to the multilayer stripe's b axis. The in-plane optical anisotropy of the stripelike GeS is clearly shown.

    6. Harnessing Triplet Excited States by Fluorescent Dopant Utilizing Codoped Phosphorescent Dopant in Exciplex Host for Efficient Fluorescent Organic Light Emitting Diodes

      Hyun-Gu Kim, Kwon-Hyeon Kim, Chang-Ki Moon and Jang-Joo Kim

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/adom.201600749

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      The singlet fraction of excitons on a conventional fluorescent emitter is increased by reverse intersystem crossing of exciplexes and the sensitization effect of phosphorescent materials. Consequently, a red fluorescent organic light-emitting diode (OLED) with an external quantum efficiency (EQE) of 23.7% is realized and an EQE of nearly 30% may be expected if all singlet excitons in the fluorescent emitter decay radiatively.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    9. Frontispiece
    10. Communications
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      Bioimaging: Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials (Advanced Optical Materials 3/2017)

      María F. Acosta, Sergio G. Rodrigo, Luis Martín-Moreno, Carlos Pecharromán and Rosa I. Merino

      Version of Record online: 2 FEB 2017 | DOI: 10.1002/adom.201770017

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      A LiF pillar perforated microholey aluminum layer is shown in the image by Rosa I. Merino and co-workers. The structure presented in article number 1600670 is prepared using a directionally solidified eutectic slice as template. Two features make it particularly relevant: the holes are filled with towering dielectric or polaritonic micropillars; and it can be transferred to polymer films, which makes it flexible. It shows enhanced subwavelength transmittance at NIR and THz wavelengths. The band-pass windows can be tailored via the hole dimension and the eutectic used as template.

  9. Communications

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    1. Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials

      María F. Acosta, Sergio G. Rodrigo, Luis Martín-Moreno, Carlos Pecharromán and Rosa I. Merino

      Version of Record online: 18 NOV 2016 | DOI: 10.1002/adom.201600670

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      Arrays of holey metal films with dielectric or polaritonic micropillars filling or towering over the holes are prepared using templates from directionally solidified eutectics. The structures can be flexible and show localized enhanced optical transmittance and absorption induced transparency (AIT) in the near-infrared or THz ranges. This is the first time that AIT is experimentally demonstrated at THz frequencies.

    2. Direct Observation of Spin States Involved in Organic Electroluminescence Based on Thermally Activated Delayed Fluorescence

      Stefan Väth, Kristofer Tvingstedt, Michael Auth, Andreas Sperlich, Asta Dabuliene, Juozas V. Grazulevicius, Pavlo Stakhira, Vladyslav Cherpak and Vladimir Dyakonov

      Version of Record online: 20 DEC 2016 | DOI: 10.1002/adom.201600926

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      The first application of electroluminescence detected electron spin resonance technique on electroluminescent thermally activated delayed fluorescence (TADF) devices is shown. It indubitably proves the involvement of spins in the emergence of TADF electroluminescence and reveals the temperature dependency of such spin-dependent processes on bilayer devices that consist of two different material systems.

    3. One-Structure-Based Barrier Film for Simultaneous Exclusion of Water and Ultraviolet Light

      Illhwan Lee, Seungo Gim, Jae Yong Park, Sung Joo Kim and Jong-Lam Lee

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/adom.201600888

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      A new type of multifunctional barrier film is proposed that prevents penetration by both water and ultraviolet (UV) light. To enable a low-cost and simple process, a fabrication approach is developed that uses UV-distributed Bragg reflector structures to combine thin-film passivation and a UV reflector.

    4. Bilayer Interdiffused Heterojunction Organic Photodiodes Fabricated by Double Transfer Stamping

      Hyunsoo Kim, Byeongseop Song, Kyusang Lee, Stephen Forrest and Jerzy Kanicki

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/adom.201600784

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      A novel double transfer stamping method for the fabrication of a bilayer, interdiffused organic photodetector is demonstrated. The concept leads to a device having both a low dark current density of 7.7 nA cm−2 and high external quantum efficiency of 60% through optimized segregation of electron donor and acceptor materials within the active layer.

  10. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Reviews
    8. Communications
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Extraordinary Figure-of-Merit of Magnetic Resonance from Ultrathin Silicon Nanohole Membrane as All-Dielectric Metamaterial

      Sang-Gil Park, Youngseop Lee, Seyong Kwon, SeokJae Yoo, Q-Han Park, Je-Kyun Park and Ki-Hun Jeong

      Version of Record online: 7 NOV 2016 | DOI: 10.1002/adom.201600628

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      A silicon nanohole metamaterial with ultrathin membrane configuration for an extraordinary figure-of-merit (FOM), defined by sensitivity (resonance shift/refractive index change) over full width at half maximum, is demonstrated based on magnetic resonance shift depending on index changes of the surrounding medium. This all-dielectric metamaterial successfully demonstrates an exceptional FOM of 29, which is 7.6 times higher than those values of conventional metamaterials.

    2. Eu3+-Doped Phosphor-in-Glass: A Route toward Tunable Multicolor Materials for Near-UV High-Power Warm-White LEDs

      Jiankun Deng, Wei Li, Haoran Zhang, Yingliang Liu, Bingfu Lei, Haiming Zhang, Lingshan Liu, Xue Bai, Haoyang Luo, Hongzhong Liu, Wei-Ren Liu and Jing Wang

      Version of Record online: 6 JAN 2017 | DOI: 10.1002/adom.201600910

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      Eu3+-doped phosphor-in-glass is prepared by combination of Sr4Al14O25:Eu2+ phosphors and Eu3+ activated glass frits to obtain a series of tunable multicolor materials. By careful regulation, such colorful Eu3+-doped phosphor-in-glass can be used for high-power warm-white-light-emitting diodes (LEDs), showing a good application prospect in solid state lighting sources.

    3. Electron Energy Loss Spectroscopy of Hot Electron Transport between Gold Nanoantennas and Molybdenum Disulfide by Plasmon Excitation

      Gregory T. Forcherio, Mourad Benamara and D. Keith Roper

      Version of Record online: 2 NOV 2016 | DOI: 10.1002/adom.201600572

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      Femtosecond transport of plasmonic hot electrons from gold nanospheres to monolayer molybdenum disulfide is measured by low-loss electron energy loss spectroscopy. Quantum efficiency of plasmonic damping to hot electrons injected into the MoS2 conduction band is estimated to be 6% by bandwidth analysis, corroborated by electron- and light-excitation discrete dipole simulations.

    4. Fast–Slow Red Upconversion Fluorescence Modulation from Ho3+-Doped Glass Ceramics upon Two-Wavelength Excitation

      Zhi Chen, Wentao Cui, Shiliang Kang, Hang Zhang, Guoping Dong, Chun Jiang, Shifeng Zhou and Jianrong Qiu

      Version of Record online: 15 NOV 2016 | DOI: 10.1002/adom.201600554

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      A novel tactic has been introduced to manipulate the fast–slow optical modulation of red upconversion fluorescence from LaF3:Ho3+ nanocrystal embedded glass ceramics via two-wavelength laser excitation at 980 and 1870 nm. Importantly, this exquisite physical strategy using single-rare-earth-doped materials, regulating one light field by another, might become an attractive area of research in the development of all-optical network information science.

    5. Extreme Refractive Index Wing Scale Beads Containing Dense Pterin Pigments Cause the Bright Colors of Pierid Butterflies

      Bodo D. Wilts, Bas Wijnen, Hein L. Leertouwer, Ullrich Steiner and Doekele G. Stavenga

      Version of Record online: 28 NOV 2016 | DOI: 10.1002/adom.201600879

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      In the common pierid butterflies, the coloration arises from the interplay of absorption and scattering of light by pigment-loaded granules in their wing scales. The study shows that the bead's shape is optimized for light scattering and that the complex refractive index of these pigmented granules, with values above 2 in the visible wavelength range, is unusually high for biological materials.

    6. Coherent and Polarized Random Laser Emissions from Colloidal CdSe/ZnS Quantum Dots Plasmonically Coupled to Ellipsoidal Ag Nanoparticles

      Yung-Chi Yao, Zu-Po Yang, Jung-Min Hwang, Hai-Ching Su, Jing-Yu Haung, Tzu-Neng Lin, Ji-Lin Shen, Min-Hung Lee, Meng-Tsan Tsai and Ya-Ju Lee

      Version of Record online: 28 NOV 2016 | DOI: 10.1002/adom.201600746

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      In this work, to the best of our knowledge, the first experimental demonstration of coherent and polarized random laser based on the colloidal CdSe/ZnS quantum dots is reported. The localized surface plasmon resonances associated with the ellipsoidal Ag NPs are used not only to enhance light scattering of emitted light but also to control the optical polarization of lasing emissions.

    7. Single Crystal Microrod Based Homonuclear Photonic Molecule Lasers

      Kaiyang Wang, Wenzhao Sun, Shuai Wang, Shuai Liu, Nan Zhang, Shumin Xiao and Qinghai Song

      Version of Record online: 19 DEC 2016 | DOI: 10.1002/adom.201600744

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      Photonic molecule lasers based on CH3NH3PbBr3 perovskite microrods are experimentally demonstrated. Benefiting from the uniform and smooth surface of the high crystal quality perovskite microrod, photonic molecules can be simply assembled by breaking one microrod into two segments and then approaching them via micromanipulation. This finding sheds light not only on fundamental scientific research, but also on the advances of photonic molecule lasers and parity-time symmetric lasers.

    8. Boron Nitride Quantum Dots with Solvent-Regulated Blue/Green Photoluminescence and Electrochemiluminescent Behavior for Versatile Applications

      Mengli Liu, Yuanhong Xu, Yao Wang, Xu Chen, Xuqiang Ji, Fushuang Niu, Zhongqian Song and Jingquan Liu

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/adom.201600661

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      Boron nitride quantum dots (BNQDs) with solvent-regulated blue/green photoluminescence and electrochemiluminescent behavior are prepared using liquid exfoliation–solvothermal treatment of bulk BN. The sizes, quantum yields, and optical properties of the BNQDs are varied with different polarity of the tested solvents. Different kinds of BNQDs can be chosen on-demand for applications in label-free specific ferric ion detection, cell imaging, and fiber staining.

    9. Tunable Broadband Wavefronts Shaping via Chaotic Speckle Image Holography Carrier Fringes

      Lei Zhou, Yu-Fu Zhu, Yun Zhou, Ben-Ling Gao and Qing-Dong Ou

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/adom.201600810

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      A new approach to fabricate speckle image holography metasurfaces with chaotic carrier fringes for broadband photon management is demonstrated. Using this holography metasurfaces structure allows to sculpt wavefronts of light almost at will.

    10. Graphene Based Terahertz Light Modulator in Total Internal Reflection Geometry

      Xudong Liu, Zefeng Chen, Edward P. J. Parrott, Benjamin S.-Y. Ung, Jianbin Xu and Emma Pickwell-MacPherson

      Version of Record online: 27 DEC 2016 | DOI: 10.1002/adom.201600697

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      Here, a new modulation approach and physical device with a high modulation depth (up to 99.3%) across 0.1–0.7 THz is presented. The device demonstrates that the new theory can be applied to make practical devices, bringing a promising new paradigm for terahertz modulation, thin-film sensing, and noninvasive material characterization.

    11. High Temperature Coupling of IR Inactive C[DOUBLE BOND]C Mode in Complementary Metal Oxide Semiconductor Metamaterial Structure

      Dihan Hasan, Prakash Pitchappa, Chong Pei Ho and Chengkuo Lee

      Version of Record online: 6 JAN 2017 | DOI: 10.1002/adom.201600778

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      High temperature coupling of infrared (IR) inactive >C[DOUBLE BOND]C< mode is reported in a complementary metal oxide semiconductor (CMOS)-compatible refractory metamaterial filter and absorber structure. The role of strain-gradient-induced dipole moment on the activation of >C[DOUBLE BOND]C< vibration at IR is confirmed. The study sets paths toward a more efficient design of spectrally selective thermophotovoltaic energy emitters and novel mechanism for high temperature sensing.

    12. Perovskite CsPb2Br5 Microplate Laser with Enhanced Stability and Tunable Properties

      Xiaosheng Tang, Zhiping Hu, Wei Yuan, Wei Hu, Haibing Shao, Dongjia Han, Junfeng Zheng, Jiongyue Hao, Zhigang Zang, Juan Du, Yuxin Leng, Liang Fang and Miao Zhou

      Version of Record online: 18 NOV 2016 | DOI: 10.1002/adom.201600788

      Thumbnail image of graphical abstract

      A new type of all-inorganic perovskite CsPb2Br5 microplate with superior crystallinity, enhanced stability, and tunable optical properties is reported by combining experimental and theoretical studies. It exhibits surprisingly low-threshold amplified spontaneous emission under both one- and two-photon excitation, which is related to its unique spatially distinguished valence/conduction band edge states originating from the intrinsic sandwiched structure.

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