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Applied Physics Letters / Volume 92 / Issue 6 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 92, 063301 (2008); doi:10.1063/1.2840153 (3 pages)

Monolithic vertical microcavities based on tetracene single crystals

Pompilio Del Carro1, Andrea Camposeo1, Luana Persano1, Silvia Tavazzi2, Marcello Campione2, Antonio Papagni2, Luisa Raimondo2, Leonardo Silvestri2, Peter Spearman2, Roberto Cingolani1, and Dario Pisignano1

1National Nanotechnology Laboratory (NNL) of INFM-CNR, c/o Distretto Tecnologico ISUFI, Università del Salento, via Arnesano, I-73100 Lecce, Italy
2Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, via Cozzi 53, I-20125 Milano, Italy

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(Received 9 October 2007; accepted 13 January 2008; published online 11 February 2008)

The authors report on monolithic, light-emitting vertical microcavities based on an organic semiconductor single crystal. The devices are realized by reactive electron-beam deposition of dielectric mirrors and growth of tetracene crystals by physical vapor transport. The microcavities exhibit optical cavity modes in the visible range (550–580 nm) with full width at half maximum down to 2–3 nm, corresponding to a Q factor of about 200, and polarization-induced modal splitting up to 20 meV. These results open perspectives for the realization of polarized-emitting optoelectronic devices based on organic crystals.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

distributed Bragg reflectors, light emitting devices, microcavities, microcavity lasers, optoelectronic devices, organic semiconductors, semiconductor lasers

PACS

ARTICLE DATA

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http://link.aip.org/link/doi/10.1063/1.2840153

PUBLICATION DATA

ISSN:

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

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$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
Polarized absorption spectrum taken at normal incidence (dotted line, left vertical scale) and PL spectrum (solid line, right scale) of TCN single crystals. Left inset: arrangement of the TCN molecules in the unit cell as viewed from the c* axis. Right inset: measured wavelength behavior of the real (n, solid line, left scale) and imaginary (k, dotted line, right scale) parts of the crystal refractive index.

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

FIG.2
Microcavity transmission at normal incidence (dashed line, left vertical scale), and normal PL spectra from a microcavity (continuous line, right scale) and from a TCN crystal on a bottom DBR (dotted line, right scale). Inset: scheme of the TCN microcavity structure.

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

FIG.3
Angular dependences of the resonance frequencies, extracted by transmission measurements, for TE (full dots) and TM (open circles) polarizations, for a TCN microcavity with crystal thickness 420 nm. The superimposed continuous lines represent the fitting curves calculated according to Eq. ( 1 ). Inset: TE (dotted line) and TM (continuous line) transmission spectra for Θ = 40°.

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



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