Mr. Maik Langner Profile

Maik Langner

at TU Dresden

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Proceedings Article | 16 April 2008 Paper

Sub-nanojule threshold lasing in 5x5μm2 organic photonic boxes

Maik Langner, Markas Sudzius, Susanne Hintschich, Hartmut Fröb, Vadim Lyssenko, Karl Leo

Proceedings Volume 6999, 699902 (2008) https://doi.org/10.1117/12.781158

KEYWORDS: Optical microcavities, Mirrors, Photons, Molecules, Optical filtering, Pulsed laser operation, Photonic microstructures, Microscopes, Absorption, Laser damage threshold

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×The lasing threshold of a microcavity is mainly determined by the spontaneous emission factor β, which is inversely proportional to the mode volume V_c. We demonstrate an experimental way to decrease the mode volume via lateral structuring of the microcavity. This redistributes both number and density of the transversal cavity modes, which increases the amplitude of the internal electromagnetic field. Our samples are microcavities with an active layer of variable thickness (0.2 to 2 μm) made of tris-(8-hydroxyquinoline) aluminium (Alq₃) doped with 4-(dicyanomethylene)-2- methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM). With thermal coevaporation through a shadow mask, this layer is structured into an array of photonic boxes square-shaped microcavities with an area of 55 μm₂. Using a microscope objective, we record the spatial distribution of the cavity transmission spectra with submicron resolution. The modes of the photonic boxes show a clear discretization, which is due to the multidimensional optical confinement. Under selective excitation of the DCM molecules via a focused pulsed laser (532 nm, 1.5 ns, 2 kHz , &diameter; ≈ 3μm), we record the spatially and spectrally resolved emission of single photonic boxes. The laser pulse energy is varied to obtain input-output curves of the cavity modes. At an excitation energy of ~30 pJ, we observe superlinear growth as well as a spectral narrowing of the emission from the lowest energy mode of a single photonic box. For this lasing transition, we determine a spontaneous emission factor β of ≈0.01.

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