Advanced Optical Materials

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  1. Sol–Gel Route Toward Efficient and Robust Distributed Bragg Reflectors for Light Management Applications

    Barbara Brudieu, A. Le Bris, J. Teisseire, F. Guillemot, G. Dantelle, S. Misra, P. Roca i Cabarrocas, F. Sorin and T. Gacoin

    Article first published online: 18 SEP 2014 | DOI: 10.1002/adom.201400292

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    A simple and versatile liquid-based approach for the deposition of macroporous silica and dense titania layers is developed to elaborate highly reflective and wavelength tunable Distributed Bragg Reflectors over a large surface area. This material combination is robust against ageing tests under humidity exposure. Its integration in a a-Si:H solar cell is demonstrated, and results in an increase of light absorption and photocurrent.

  2. Twisted Focusing of Optical Vortices with Broadband Flat Spiral Zone Plates

    Hong Liu, Muhammad Q. Mehmood, Kun Huang, Lin Ke, Huapeng Ye, Patrice Genevet, Mingsheng Zhang, Aaron Danner, Swee Ping Yeo, Cheng-Wei Qiu and Jinghua Teng

    Article first published online: 18 SEP 2014 | DOI: 10.1002/adom.201400315

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    Topologically breaking in-plane symmetry, the nanoengineered flat logarithmic spiral zone plates (LSZPs) continuously modulate both amplitude and phase of the diffracted field to form twisted focusing of optical vortices spatially spiraling with variant transverse intensity profiles. Owing to its rich structural degree of freedom upon aperiodic and continuously variant features, the LSZP exhibits polarization-insensitive and broadband behaviors.

  3. Direct Sensing in Liquids Using Whispering-Gallery-Mode Droplet Resonators

    Saverio Avino, Anika Krause, Rosa Zullo, Antonio Giorgini, Pietro Malara, Paolo De Natale, Hans Peter Loock and Gianluca Gagliardi

    Article first published online: 17 SEP 2014 | DOI: 10.1002/adom.201400322

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    Liquid droplets suspended by the tip of a thin wire, a glass capillary, or a needle form high-Q optical resonators, thanks to surface tension. Under gravity equilibrium conditions, the maximum drop diameter is approximately 1.5 mm for paraffin oil (volume ∼ 0.5 μL) using, for instance, a silica fiber with 250 μm thickness. Whispering gallery modes are excited by a free-space near-infrared laser that is frequency locked to the cavity resonance. The droplet cavity serves as a miniature laboratory for sensing of chemical species and particles.

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    Microshells: Photoresponsive Monodisperse Cholesteric Liquid Crystalline Microshells for Tunable Omnidirectional Lasing Enabled by a Visible Light-Driven Chiral Molecular Switch (Advanced Optical Materials 9/2014) (page 904)

    Lujian Chen, Yannian Li, Jing Fan, Hari Krishna Bisoyi, David A. Weitz and Quan Li

    Article first published online: 16 SEP 2014 | DOI: 10.1002/adom.201470060

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    A self-organized, phototunable 3D photonic superstructure is fabricated from a photoresponsive 1D liquid crystal using microfluidics. On page 845, Q. Li and co-workers show how the resulting monodisperse microshells are water-oil-water double emulsions, in which the oil phase consists of the photoresponsive liquid crystals. The cholesteric microshells exhibit band-edge lasing in all directions, and the wavelength of the resultant band-edge laser is tuned via the pumping laser, causing photoisomerization of the chiral molecular switch.

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    Patterning: Optical Nanoscale Patterning Through Surface-Textured Polymer Films (Advanced Optical Materials 9/2014) (page 854)

    Ming Fang, Hao Lin, Ho-Yuen Cheung, SenPo Yip, Fei Xiu, Chun-Yuen Wong and Johnny C. Ho

    Article first published online: 16 SEP 2014 | DOI: 10.1002/adom.201470057

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    On page 855, J. C. Ho and co-workers exploit a simple photolithographic technique using surface-textured soft polymer films as optical masks for the area selective exposure of photoresists upon flood UV illumination. This allows rapid fabrication of periodic nanopatterns over large areas, and by simply varying the mask and tuning the exposure dose, patterns with different geometric characteristics can be obtained in a controllable manner. Importantly, these polymer masks can be used numerous times, making this technique a reliable low-cost alternative to the existing methods.

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