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Applied Physics Letters / Volume 97 / Issue 21 / LASERS, OPTICS, AND OPTOELECTRONICS
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Appl. Phys. Lett. 97, 211101 (2010); http://dx.doi.org/10.1063/1.3517566 (3 pages)

Hemispherical resonators with embedded nanocrystal quantum rod emitters

J. Haase1, S. Shinohara2, P. Mundra3, G. Risse4, V. G. Lyssenko1, H. Fröb1, M. Hentschel2, A. Eychmüller3, and K. Leo1

1Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany
2Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany
3Physikalische Chemie und Elektrochemie, Technische Universität Dresden, 01062 Dresden, Germany
4Gesellschaft zur Förderung von Medizin-, Bio-, und Umwelttechnologien (GMBU) e.V., 01317 Dresden, Germany

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(Received 15 April 2010; accepted 24 September 2010; published online 22 November 2010)

We report a technique to prepare hemispherical resonators on a distributed Bragg reflector (DBR). This so-called hydrophobic spreading allows the creation of hemispherical structures with diameters ranging from 5 to 50 μm. By embedding semiconductor nanocrystal quantum rods (NQRs) into these structures, we achieve a coupling of their emission into whispering-gallery modes. Although the NQR-emission is confined in three dimensions, the DBR is transparent for the excitation, allowing selective excitation of different regions of the hemisphere. Employing a two-dimensional model to approximately describe relevant modes, we are able to estimate the refractive index and diameters of the hemispheres from spectral data.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

distributed Bragg reflectors, hydrophobicity, nanophotonics, nanostructured materials, optical resonators, refractive index, whispering gallery modes

PACS

  • 42.79.Bh

    Lenses, prisms and mirrors

  • 42.82.Cr

    Fabrication techniques; lithography, pattern transfer

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3517566

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
(a) Electron micrograph of polymer hemispheres prepared on a DBR by hydrophobic spreading. The structures form rows in spreading direction with diameters reaching from 5 to 50 μm. The image is taken at an angle of 30° to the mirror surface. (b) Fluorescence microscope image of the NQR-doped polymer hemispheres as shown above. The structures are excited with blue light and show enhanced emission at the circumference, due to the highly efficient coupling of NQR-emission into the WGMs.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(a) Microphotoluminescense spectra of a hemisphere with (13.4±2.0) μm in diameter, taken at the edge (solid line) and in the center (dashed line) of the structure. The discrete peaks from the edge spectrum are assigned to TE (dotted lines) and TM (dash-dotted lines) WGMs with corresponding quantum numbers m. (b) Spatially resolved (coordinate x) spectrum with indicated cross-sections, corresponding to the spectra above.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Theoretical dependence of the mode spacing ratios, αm (decreasing branches) and βm (increasing branches), on the angular momentum quantum number m, plotted for effective refractive indices neff = 1.40, 1.46, and 1.50. Experimental values from hemispheres with diameters of (5.5±1.6), (7.2±1.9), and (13.4±2.0) μm are plotted with confidence intervals.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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