Advanced Optical Materials

Cover image for Vol. 2 Issue 3

March 2014

Volume 2, Issue 3

Pages 199–299

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      Silicon Carbide: Enhanced Dielectric Properties and Excellent Microwave Absorption of SiC Powders Driven with NiO Nanorings (Advanced Optical Materials 3/2014) (page 199)

      Huijing Yang, Maosheng Cao, Yong Li, Honglong Shi, Zhiling Hou, Xiaoyong Fang, Haibo Jin, Wenzhong Wang and Jie Yuan

      Version of Record online: 12 MAR 2014 | DOI: 10.1002/adom.201470013

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      A microwave-absorption material with a wonderful microwave response is realized by M. Cao, H. Jin, W. Wang, and co-workers, who grow NiO nanorings on the surface of silicon carbide via a facile two-step strategy described on page 214. The SiC assembled with NiO nanorings exhibits highly enhanced dielectric properties and a strong microwave absorption due to the hopping charge induced by the NiO nanorings.

  2. Inside Front Cover

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      Lasers: Coupled Polymer Microfiber Lasers for Single Mode Operation and Enhanced Refractive Index Sensing (Advanced Optical Materials 3/2014) (page 200)

      Van Duong Ta, Rui Chen and Handong Sun

      Version of Record online: 12 MAR 2014 | DOI: 10.1002/adom.201470014

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      A single-mode laser is obtained by H. D. Sun and co-workers from coupled whispering gallery mode fiber lasers (two bright rings) via the Vernier effect under optical excitation (green light). Application of the coupled structure for refractive index sensing of ethanol solution (molecules), as shown on page 220, exhibits a doubled sensitivity compared with the single structure. The background shows the magnetic field distribution of a typical coupled cavity.

  3. Back Cover

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      Flexible LEDs: Fully Flexible GaN Light-Emitting Diodes through Nanovoid-Mediated Transfer (Advanced Optical Materials 3/2014) (page 302)

      Jun Hee Choi, Eun Hyoung Cho, Yun Sung Lee, Mun-Bo Shim, Ho Young Ahn, Chan-Wook Baik, Eun Hong Lee, Kihong Kim, Tae-Ho Kim, Sangwon Kim, Kyung-Sang Cho, Jongseung Yoon, Miyoung Kim and Sungwoo Hwang

      Version of Record online: 12 MAR 2014 | DOI: 10.1002/adom.201470017

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      Fully flexible GaN-LEDs emitting bright green or blue light are demonstrated by J. H. Choi, M. Kim, and co-workers on page 267. The LEDs have an embedded architecture consisting of hard GaN light-emitting arrays embedded in a soft polymer matrix. This is enabled by accurately reducing the adhesion strength of the LT-GaN/Ti hetero-interface via nanovoid formation, and transferring the stack arrays into ultrathin, flexible substrates.

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      Masthead: (Advanced Optical Materials 3/2014)

      Version of Record online: 12 MAR 2014 | DOI: 10.1002/adom.201470016

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  6. Frontispiece

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      Second Harmonic Generation: Second Harmonic Generation Circular Dichroism from Self-Ordered Hybrid Plasmonic–Photonic Nanosurfaces (Advanced Optical Materials 3/2014) (page 207)

      Alessandro Belardini, Alessio Benedetti, Marco Centini, Grigore Leahu, Francesco Mura, Simona Sennato, Concita Sibilia, Valentina Robbiano, Maria Caterina Giordano, Christian Martella, Davide Comoretto and Francesco Buatier de Mongeot

      Version of Record online: 12 MAR 2014 | DOI: 10.1002/adom.201470018

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      A. Belardini et al. find that hybrid structures composed by self-ordered dielectric nanospheres partially covered by gold nanocrescents produce an efficient second harmonic generation signal due to the cooperative effect of localized plasmon excitation and a 2D Bragg grating. Asymmetries in the geometric shape of the gold nanocrescents induce a circularly polarized optical response.

  7. Communications

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    1. Second Harmonic Generation Circular Dichroism from Self-Ordered Hybrid Plasmonic–Photonic Nanosurfaces (pages 208–213)

      Alessandro Belardini, Alessio Benedetti, Marco Centini, Grigore Leahu, Francesco Mura, Simona Sennato, Concita Sibilia, Valentina Robbiano, Maria Caterina Giordano, Christian Martella, Davide Comoretto and Francesco Buatier de Mongeot

      Version of Record online: 6 DEC 2013 | DOI: 10.1002/adom.201300385

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      Hybrid structures composed by self-ordered dielectric nanospheres and partially covered by gold nanocrescents, produce efficient second harmonic generation signals due to the cooperative effect of localized plasmon excitation and 2D Bragg gratings. Asymmetries in the geometric shape of the gold nanocrescents induce a circularly polarized optical response.

    2. Enhanced Dielectric Properties and Excellent Microwave Absorption of SiC Powders Driven with NiO Nanorings (pages 214–219)

      Huijing Yang, Maosheng Cao, Yong Li, Honglong Shi, Zhiling Hou, Xiaoyong Fang, Haibo Jin, Wenzhong Wang and Jie Yuan

      Version of Record online: 11 DEC 2013 | DOI: 10.1002/adom.201300439

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      Enhancement of the dielectric properties of SiC is achieved by growing the NiO nanorings on the surface of SiC. The SiC assembled with NiO nanorings exhibits highly enhanced dielectric properties and strong microwave absorption due to the hopping charge induced by the NiO nanorings.

    3. Coupled Polymer Microfiber Lasers for Single Mode Operation and Enhanced Refractive Index Sensing (pages 220–225)

      Van Duong Ta, Rui Chen and Handong Sun

      Version of Record online: 4 DEC 2013 | DOI: 10.1002/adom.201300433

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      Single mode lasing operation is obtained from coupled whispering gallery mode polymer fiber lasers via the Vernier effect. This coupled structure offers a significant improvement in sensitivity (∼400 nm/refractive index unit) for refractive index sensing compared to a single cavity. These findings imply that polymer fibers are promising candidates for micro/nano-integrated photonic devices because of their mechanical flexibility and cost-effectiveness.

    4. Transverse Mode Localization in Three-Dimensional Deterministic Aperiodic Structures (pages 226–230)

      Michael Renner and Georg von Freymann

      Version of Record online: 2 JAN 2014 | DOI: 10.1002/adom.201300494

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      Three-dimensional deterministic aperiodic structures forming an own class of solid materials are realized for the first time by means of direct laser writing. Optical transport behavior is studied in transmission experiments, revealing significant differences in the eigenmode properties of structures with different lattice spectra.

    5. Wood Pulp-Based Optically Transparent Film: A Paradigm from Nanofibers to Nanostructured Fibers (pages 231–234)

      Hiroyuki Yano, Shouzou Sasaki, Md. Iftekhar Shams, Kentaro Abe and Takeshi Date

      Version of Record online: 5 FEB 2014 | DOI: 10.1002/adom.201300444

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      A low thermally expanded transparent film is developed by exploiting wood fibers that can be considered to be nanostructured fibers in which individual nanofibers do not significantly agglomerate and are oriented parallel to the fiber direction. It is thereby demonstrated that paper, used since ancient times, will be a next-generation optical material.

    6. Magnesiothermically Formed Porous Silicon Thin Films on Silicon-on-Insulator Optical Microresonators for High-Sensitivity Detection (pages 235–239)

      Zhixuan Xia, Stan C. Davis, Ali A. Eftekhar, Ari S. Gordin, Murtaza Askari, Qing Li, Farshid Ghasemi, Kenneth H. Sandhage and Ali Adibi

      Version of Record online: 27 JAN 2014 | DOI: 10.1002/adom.201300465

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      Integration of a thin uniform layer of highly porous silicon on top of ultra-compact silicon-on-insulator microresonators is experimentally demonstrated via magnesiothermic reduction, enabling increased surface area for analyte adsorption as well as high Q-factor (~22 000). The demonstrated sensitivity is ~0.8 pm (pg mm-2)-1, with an estimated detection limit of areal mass density being ~1 pg mm-2.

    7. Rare-Earth Doped ZnO Films: A Material Platform to Realize Multicolor and Near-Infrared Electroluminescence (pages 240–244)

      Yang Yang, Yunpeng Li, Canxing Wang, Chen Zhu, Chunyan Lv, Xiangyang Ma and Deren Yang

      Version of Record online: 2 JAN 2014 | DOI: 10.1002/adom.201300406

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      Light-emitting devices based on MgxZn1-xO/ZnO:RE/Si heterostructures are proposed. Hot holes formed in MgxZn1-xO layers enter into ZnO:RE layers to impact-excite the RE3+ ions therein. From the devices using ZnO:RE (Eu, Er and Tm) films, electroluminescence in red, green, blue, and also optical-communication wavelengths are achieved. Such RE-related electroluminescence can be activated by extraordinarily low voltages of only several volts.

    8. Scalable Fabrication of Composite Ti/Ag Plasmonic Helices: Controlling Morphology and Optical Activity by Tailoring Material Properties (pages 245–249)

      George K. Larsen, Yizhuo He, Jing Wang and Yiping Zhao

      Version of Record online: 23 JAN 2014 | DOI: 10.1002/adom.201300478

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      Arrays of plasmonic nanohelices that are among the most optically chiral films in the visible wavelength region are fabricated. Remarkably, excellent results are achieved using a simple, one step method with great scalability. This is done by combining room-temperature glancing angle deposition with the co-deposition of titanium and silver.

    9. Light-Directed Writing of Chemically Tunable Narrow-Band Holographic Sensors (pages 250–254)

      Ali K. Yetisen, Haider Butt, Fernando da Cruz Vasconcellos, Yunuen Montelongo, Colin A. B. Davidson, Jeff Blyth, Leon Chan, J. Bryan Carmody, Silvia Vignolini, Ullrich Steiner, Jeremy J. Baumberg, Timothy D. Wilkinson and Christopher R. Lowe

      Version of Record online: 2 JAN 2014 | DOI: 10.1002/adom.201300375

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      This tunable holographic sensor offers interrogation and a reporting transducer as well as an analyte-responsive hydrogel, rendering it label-free and reusable. A single 6 ns laser pulse is used to fabricate holographic sensors consisting of silver nanoparticles arranged periodically within a polymer film. The tunability of the sensor is demonstrated through pH sensing of artificial urine and validated through computational modeling.

  8. Frontispiece

    1. Top of page
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    3. Inside Front Cover
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    5. Masthead
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    8. Communications
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      Negative Index Materials: Materials Selections and Growth Conditions for Large-Area, Multilayered, Visible Negative Index Metamaterials Formed by Nanotransfer Printing (Advanced Optical Materials 3/2014) (page 255)

      Li Gao, Youngmin Kim, Abraham Vazquez-Guardado, Kazuki Shigeta, Steven Hartanto, Daniel Franklin, Christopher J. Progler, Gregory R. Bogart, John A. Rogers and Debashis Chanda

      Version of Record online: 12 MAR 2014 | DOI: 10.1002/adom.201470019

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      J. A. Rogers, D. Chanda, and co-workers use a nanotransfer printing technique to fabricate large-area visible 3D negative index metamaterials. Alternating silver and dielectric layers are printed over a large area on a flexible substrate, and deposition conditions are introduced such that nearly ideal geometries with excellent optical properties are obtained.

  9. Communications

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    1. Materials Selections and Growth Conditions for Large-Area, Multilayered, Visible Negative Index Metamaterials Formed by Nanotransfer Printing (pages 256–261)

      Li Gao, Youngmin Kim, Abraham Vazquez-Guardado, Kazuki Shigeta, Steven Hartanto, Daniel Franklin, Christopher J. Progler, Gregory R. Bogart, John A. Rogers and Debashis Chanda

      Version of Record online: 11 DEC 2013 | DOI: 10.1002/adom.201300356

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      Nanotransfer printing is used to fabricate large-area visible 3D negative index metamaterials. Material growth aspects of nanotransfer printing are explored for multilayered metamaterials, and alternative dielectrics and deposition conditions are introduced that enabled nearly ideal geometries with excellent optical properties.

  10. Full Papers

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    1. Highly Efficient Organic Light-Emitting Devices Prepared with a Phosphorescent Heteroleptic Iridium (III) Complex Containing 7,8-Benzoquinoline as the Cyclometalated Ligand (pages 262–266)

      Frédéric Dumur, Marc Lepeltier, Hossein Zamani Siboni, Didier Gigmes and Hany Aziz

      Version of Record online: 2 JAN 2014 | DOI: 10.1002/adom.201300437

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      An heterolepetic complex comprising 7,8-benzoquinoline as the cyclometalated ligand and acetylacetone as the ancillary ligand is investigated for the first time as emitter material for phosphorescent OLEDs. This complex exhibits highly emissive properties and an optimum dopant concentration is determined as being 8 wt%. This material is also determined as being effective to avoid critical emitter−emitter aggregation.

    2. Fully Flexible GaN Light-Emitting Diodes through Nanovoid-Mediated Transfer (pages 267–274)

      Jun Hee Choi, Eun Hyoung Cho, Yun Sung Lee, Mun-Bo Shim, Ho Young Ahn, Chan-Wook Baik, Eun Hong Lee, Kihong Kim, Tae-Ho Kim, Sangwon Kim, Kyung-Sang Cho, Jongseung Yoon, Miyoung Kim and Sungwoo Hwang

      Version of Record online: 29 NOV 2013 | DOI: 10.1002/adom.201300435

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      Fully flexible GaN-LEDs yielding bright green or blue light are demonstrated. The LED structure, consisting of hard GaN light-emitting arrays embedded in a soft polymer matrix, is advantageous for high flexibility. This is enabled by accurately reducing the adhesion strength of the LT-GaN/Ti hetero-interface and transferring the stack arrays into ultrathin, flexible substrates.

    3. Liquid Crystal Metamaterial Absorber Spatial Light Modulator for THz Applications (pages 275–279)

      Salvatore Savo, David Shrekenhamer and Willie J. Padilla

      Version of Record online: 2 JAN 2014 | DOI: 10.1002/adom.201300384

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      Metamaterial absorbers combined with liquid crystals are used to implement a spatial light modulator (SLM) for THz frequencies. Here a 6 × 6 pixel SLM is presented where the orientation of liquid crystals is electronically controlled. The device, designed to work in reflection mode, shows 75% modulation performance. By changing the orientation of each pixel independently patterns can be formed at will.

    4. Sub-100-nm Sized Silver Split Ring Resonator Metamaterials with Fundamental Magnetic Resonance in the Middle Visible Spectrum (pages 280–285)

      Landobasa Y. M. Tobing, Liliana Tjahjana, Dao Hua Zhang, Qing Zhang and Qihua Xiong

      Version of Record online: 3 JAN 2014 | DOI: 10.1002/adom.201300456

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      Split ring resonator (SRR) metamaterials working in the visible spectrum have great potential application but their fabrication is challenging due to the stringent requirements in the feature size and critical dimension. This paper presents the fabrication and characterization of silver SRRs, where the resonator size of ∼60 nm and fundamental magnetic resonance of ∼604 nm are successfully demonstrated.

    5. Stable and Efficient Thin Layer DFB Lasers Based on Side-Chain Azobenzene Polymers (pages 286–291)

      Leonid M. Goldenberg, Victor Lisinetskii and Sigurd Schrader

      Version of Record online: 7 JAN 2014 | DOI: 10.1002/adom.201300425

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      Thin film DFB lasers based on azobenzene-containing side chain polymers doped with different laser dyes emit from 670 to 870 nm. Some of the lasers exhibit remarkable half lives, exceeding 105 pulses. The lasers emitting in the 1st diffraction order show efficiencies of ca. 3–4% and lasing thresholds lower than 10 μJ cm−2.

    6. Anomalous Photodeposition of Ag on Ferroelectric Surfaces with Below-Bandgap Excitation (pages 292–299)

      Katyayani Seal, Brian J. Rodriguez, Ilia N. Ivanov and Sergei V. Kalinin

      Version of Record online: 21 JAN 2014 | DOI: 10.1002/adom.201300380

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      Ferroelectric lithography, a recent method of fabricating functional interfaces, traditionally involves photoreduction on polarized ferroelectric surfaces at optical energies above the bandgap of the ferroelectric. Here, photochemical deposition of Ag nanoparticles on a specifically poled lithium niobate substrate is reported, with a broad white-light spectrum transmitted through the crystal. The transmitted light has energies only below the bandgap, i.e., Ag reduction proceeds through second harmonic generation.

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