Dynamics of a high-Q vertical-cavity organic laser

Koschorreck, M.; Gehlhaar, Robert; Lyssenko, V. G.; Swoboda, Marko; Hoffmann, Michael J.; Leo, Karl

doi:10.1063/1.2125128

Cited by 106 publications

(83 citation statements)

References 22 publications

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“…voltage/current controlled), thus reducing the size and the cost of the polymer laser system. While optically pumped organic lasers have been widely demonstrated [8][9][10][11] , lasing is only possible with high peak power excitation sources of short pulses; no continuouswave (CW) operated organic lasers has been demonstrated without liquid dye circulation.…”

Section: Introductionmentioning

confidence: 99%

Modeling of threshold and dynamics behavior of organic nanostructured lasers

et al. 2014

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Organic dye molecules offer significant potential as gain media in the emerging field of optical amplification and lasing at subwavelength scales. Here, we investigate the laser dynamics in systems comprising subwavelength-structured cavities that incorporate organic dyes. To this end, we have developed a comprehensive theoretical framework able to accurately describe the interaction of organic molecules with any arbitrary photonic structure to produce single-mode lasing. The model provides explicit analytic expressions of the threshold and slope efficiency that characterize this class of lasers, and also the duration over which lasing action can be sustained before the dye photobleaches. Both the physical properties of the dyes and the optical properties of the cavities are considered. We also systematically studied the feasibility of achieving lasing action under continuous-wave excitation in optically pumped monolithic organic dye lasers. This study suggests routes to realize an organic laser that can potentially lase with a threshold of only a few W /cm 2 . Our work puts forward a theoretical formalism that could enable the advancement of nanostructured organic-based light emitting and sensing devices.

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Section: Introductionmentioning

confidence: 99%

Modeling of threshold and dynamics behavior of organic nanostructured lasers

et al. 2014

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“…3 Other applications of hostguest systems are in organic field-effect transistors, 4 xerography, 5 and organic lasers. 6 But also nominally undoped systems can sometimes act as host-guest systems. In particular, many organic semiconductors contain electron traps, often caused by contact with oxygen, 7 leading to vastly reduced electron mobilities as compared to hole mobilities.…”

Section: Introductionmentioning

confidence: 99%

Field-induced detrapping in disordered organic semiconducting host-guest systems

2010

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In a disordered organic semiconducting host-guest material, containing a relatively small concentration of guest molecules acting as traps, the charge transport may be viewed as resulting from carriers that are detrapped from the guest to the host. Commonly used theories include only detrapping due to thermal excitation, described by the Fermi-Dirac ͑FD͒ distribution function. In this paper, we develop a theory describing the effect of field-induced detrapping ͑FID͒, which provides an additional contribution at finite electric fields. It is found from three-dimensional simulations that the FID effect can be described by a field-dependent generalized FD distribution that depends only on the shape of the host density of states ͑DOS͒ and not on the guest DOS. For the specific case of a Gaussian host DOS, we give an accurate and easy-to-use analytical expression for this distribution. The application of our theory is demonstrated for sandwich-type devices under conditions typical of organic light-emitting diodes.

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“…To contrast the observed threshold reduction with conventional lasing theory, the DCM microcavities are modeled using the rate equation formalism described by Koschorreck et al [5]. The dynamics of the DCM microcavities are modeled by considering the four-level structure of DCM, which in our experiments is optically pumped directly, without a Förster resonant energy transfer from the Alq 3 host matrix.…”

Section: B Conventional Laser Theorymentioning

confidence: 99%

“…A number of strategies for reducing the lasing threshold have already been explored. The most studied approach is to modify the laser resonator cavity by increasing the reflectivity of the mirrors [5], which increases the effective photon path length, thus leading to a reduced threshold. Alternatively, theory shows that the lasing threshold could be reduced by strongly coupling organic excitons to the photon field of the cavity, forming quasiparticles known as polaritons.…”

Section: Introductionmentioning

confidence: 99%

Reduced lasing threshold from organic dye microcavities

et al. 2014

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We demonstrate an unexpected tenfold reduction in the lasing threshold of an organic vertical microcavity under subpicosecond optical excitation. In contrast to conventional theory of lasing, we find that the lasing threshold depends on the rate at which excitons are created rather than the total energy delivered within the exciton lifetime. The threshold reduction is discussed in the context of microcavity-enhanced super-radiant coupling between the excitons. The interpretation of super-radiance is supported by the temporal relaxation dynamics of the microcavity emission, which follows the super-radiance time rather than the cavity lifetime. This demonstration suggests that room-temperature super-radiant effects could generally lower the threshold in four-level lasing systems of similar relaxation dynamics.

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Dynamics of a high-Q vertical-cavity organic laser

Cited by 106 publications

References 22 publications

Modeling of threshold and dynamics behavior of organic nanostructured lasers

Modeling of threshold and dynamics behavior of organic nanostructured lasers

Field-induced detrapping in disordered organic semiconducting host-guest systems

Reduced lasing threshold from organic dye microcavities

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