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  • 1.
    Anand, Srinivasan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Desieres, Y.
    KTH, School of Engineering Sciences (SCI), Applied Physics. CEA LETI MINATEC, Grenoble, France.
    Visser, D.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Chen, D-Y
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Optical Coatings and Films Based on Photonic Semiconductor Nanostructure Assemblies2017In: 2017 19TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON), IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    Photonic semiconductor nanostructure assemblies offer unique possibilities for light manipulation as well as for tailoring light-matter interaction by appropriate choice of their geometrical and material properties. The material-structure combination offers a variety of options for wavelength specific applications, deriving from the electronic properties of semiconductors and optical properties of individual and assemblies of nanostructures (particles, disks, pillars/wires etc.). We present an overview of our research on optical coatings based on semiconductor nanostructure assemblies focusing on their optical properties, different fabrication technologies and selected application examples. Design and simulations of the optical coatings are performed by finite difference time domain calculations, and are used as a guideline for fabrication. We discuss different routes for fabrication of nanostructured optical films/coatings including directed assembly and patterning of nanoparticles from solution phase, solution synthesis, combination of dry etching and colloidal lithography, transfer printing, and generation of flexible polymer films with embedded nanostructures. The fabricated films are validated by optical measurements and some device specific properties such as omni-directional broad-band anti-reflection in solar cells and efficient light extraction in light emitting diodes are demonstrated.

  • 2.
    Chen, Shula
    et al.
    Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden..
    Huang, Yuqing
    Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden..
    Visser, Dennis
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Anand, Srinivasan
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Buyanova, Irina A.
    Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden..
    Chen, Weimin M.
    Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden..
    Room-temperature polarized spin-photon interface based on a semiconductor nanodisk-in-nanopillar structure driven by few defects2018In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 3575Article in journal (Refereed)
    Abstract [en]

    Owing to their superior optical properties, semiconductor nanopillars/nanowires in one-dimensional (1D) geometry are building blocks for nano-photonics. They also hold potential for efficient polarized spin-light conversion in future spin nano-photonics. Unfortunately, spin generation in 1D systems so far remains inefficient at room temperature. Here we propose an approach that can significantly enhance the radiative efficiency of the electrons with the desired spin while suppressing that with the unwanted spin, which simultaneously ensures strong spin and light polarization. We demonstrate high optical polarization of 20%, inferring high electron spin polarization up to 60% at room temperature in a 1D system based on a GaNAs nanodisk-in-GaAs nanopillar structure, facilitated by spin-dependent recombination via merely 2-3 defects in each nanodisk. Our approach points to a promising direction for realization of an interface for efficient spin-photon quantum information transfer at room temperature-a key element for future spin-photonic applications.

  • 3.
    De Luca, Eleonora
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Visser, Dennis
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Anand, Srinivasan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Swillo, Marcin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Gallium Indium Phosphide Microstructures with Suppressed Photoluminescence for Applications in Nonlinear Optics2019In: Optics Letters, ISSN 0146-9592, Vol. 44, no 21Article in journal (Refereed)
    Abstract [en]

    Gallium indium phosphide (Ga0.51In0.49P), lattice matched to gallium arsenide, shows remarkable second-order nonlinear properties, as well as strong photoluminescence due to its direct band gap. By measuring the second-harmonic generation from the GaInP microwaveguide (0.2 x 11 x 1300 μm) before and after stimulating intrinsic photobleaching, we demonstrate that the photoluminescence could be strongly suppressed (-34 dB), leaving the nonlinear properties unchanged, making it suitable for low-noise applications.

  • 4.
    De Luca, Eleonora
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Visser, Dennis
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Anand, Srinivasan
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Swillo, Marcin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Gallium indium phosphide nanostructures with suppressed photoluminescence for applications in nonlinear optics2018In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper (Refereed)
    Abstract [en]

    Nanostructured GaInP shows remarkable second-order nonlinear properties. By measuring the second harmonic generation before and after stimulating intrinsic photobleaching, we observed suppressed photoluminescence and unchanged nonlinear properties, making it suitable for low-noise applications. 

  • 5.
    Desieres, Yohan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Chen, Ding Yuan
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Visser, Dennis
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Schippers, Casper
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Anand, Srinivasan
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Strong light extraction enhancement using TiO2 nanoparticles-based microcone arrays embossed on III-Nitride light emitting diodes2018In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 112, no 23, article id 231101Article in journal (Refereed)
    Abstract [en]

    Colloidal TiO2 nanoparticles were used for embossing of composite microcone arrays on III-Nitride vertical-thin-film blue light emitting diodes (LEDs) as well as on silicon, glass, gallium arsenide, and gallium nitride surfaces. Ray tracing simulations were performed to optimize the design of microcones for light extraction and to explain the experimental results. An optical power enhancement of similar to 2.08 was measured on III-Nitride blue LEDs embossed with a hexagonal array of TiO2 microcones of similar to 1.35 mu m in height and similar to 2.6 mu m in base width, without epoxy encapsulation. A voltage increase in similar to 70mV at an operating current density of similar to 35 A/cm(2) was measured for the embossed LEDs. The TiO2 microcone arrays were embossed on functioning LEDs, using low pressures (similar to 100 g/cm(2)) and temperatures <= 100 degrees C. 

  • 6.
    Ravishankar, Ajith P.
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    van Tilburg, Marvin A.
    KTH, School of Engineering Sciences (SCI), Applied Physics. Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands..
    Vennberg, Felix
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Visser, Dennis
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Anand, Srinivasan
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Color generation from self-organized metato-dielectric nanopillar arrays2019In: NANOPHOTONICS, ISSN 2192-8606, Vol. 8, no 10, p. 1771-1781Article in journal (Refereed)
    Abstract [en]

    Nanostructures composed of dielectric, metallic or metalo-dielectric structures are receiving significant attention due to their unique capabilities to manipulate light for a wide range of functions such as spectral colors, anti-reflection and enhanced light-matter interaction. The optical properties of such nanostructures are determined not only by the shape and dimensions of the structures but also by their spatial arrangement. Here, we demonstrate the generation of vivid colors from nanostructures composed of spatially disordered metalo-dielectric (In/InP) nanopillar arrays. The nanopillars are formed by a singlestep, ion-sputtering-assisted, self-assembly process that is inherently scalable and avoids complex patterning and deposition procedures. The In/InP nanopillar dimensions can be changed in a controlled manner by varying the sputter duration, resulting in reflective colors from pale blue to dark red. The fast Fourier transform (FFT) analysis of the distribution of the formed nanopillars shows that they are spatially disordered. The electromagnetic simulations combined with the optical measurements show that the reflectance spectra are strongly influenced by the pillar dimensions. While the specular and diffuse reflectance components are appreciable in all the nanopillar samples, the specular part dominates for the shorter nanopillars, thereby leading to a glossy effect. The simulation results show that the characteristic features in the observed specular and diffused reflectance spectra are determined by the modal and light-scattering properties of single pillars. While the work focuses on the In/InP system, the findings are relevant in a wider context of structural color generation from other types of metalo-dielectric nanopillar arrays.

  • 7.
    Visser, Dennis
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Basuvalingam, Saravana Balaji
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Desieres, Yohan
    KTH, School of Engineering Sciences (SCI), Applied Physics. University Grenoble Alpes, CEA, LETI, MINATEC Campus, Grenoble, F-38054, France.
    Anand, Srinivasan
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Optical properties and fabrication of dielectric metasurfaces based on amorphous silicon nanodisk arrays2019In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 4, p. 5353-5367Article in journal (Refereed)
    Abstract [en]

    Dielectric metasurfaces based on amorphous silicon (a-Si) nanodisks are interesting for nanophotonic applications due to the high refractive index and mature/low temperature fabrication of a-Si. The investigated metasurfaces consist of a-Si nanodisk arrays embedded in a transparent film. The diameter-dependent optical properties of the nanodisk Mie resonators have been investigated by finite-difference time-domain (FDTD) simulations and spectrally-resolved reflectivity and transmission measurements. Well-ordered substrate-free a-Si nanodisk arrays were fabricated and characterized with regard to their broadband anti-reflection properties when placed on a crystalline silicon (c-Si) surface, and reflectivity/ transmission properties when embedded in a polydimethylsiloxane (PDMS) film. Our results confirm broadband anti-reflection when placed on silicon, while the optical characteristics of the nanodisks embedded in PDMS are shown to be potentially useful for color/NIR filter applications as well as for coloring on the micro/nanoscale. under the terms of the OSA Open Access Publishing Agreement

  • 8.
    Visser, Dennis
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ye, Z.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Prajapati, C. S.
    Bhat, N.
    Anand, S.
    Investigations of sol-gel ZnO films nanostructured by reactive ion beam etching for broadband anti-reflection2017In: ECS Journal of Solid State Science and Technology, ISSN 2162-8769, E-ISSN 2162-8777, Vol. 6, no 9, p. P653-P659Article in journal (Refereed)
    Abstract [en]

    A novel ZnO dry etching approach is introduced using reactive ion beam etching of thick sol-gel ZnO layers for controlled nanodisk/nanocone array fabrication. In this approach the same system can be used for the colloidal lithography mask (silica particles) size reduction by a fluorine-based chemistry and etching of the ZnO nanostructures by a CH4/H2/Ar chemistry. This resulted in a ZnO:SiO2 etch selectivity of ~3.4 and etch rate of ~56 nm/min. Thick sol-gel ZnO layers, nanodisk arrays and (truncated) nanocone arrays were fabricated and their optical properties analyzed by finite-difference time-domain simulations and spectrally-resolved total/specular reflectivity measurements. The demonstrated broadband omnidirectional anti-reflection, controlled nanostructure period/geometry and low absorption in the visible-NIR spectrum makes these sol-gel ZnO nanostructures very interesting for many optoelectronic applications, including photovoltaics.

1 - 8 of 8
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