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28 January 2008 Designing emission spectra of photonic crystal microcavities
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The predictive simulation of the microcavity emission spectra is still a complex and challenging task although the physics of spontaneous emission in active microcavities is well understood. This becomes even more important because emerging technologies such as quantum cryptography and biological sensing applications rely on efficient micro-LEDs. In this work we present an efficient multilevel simulation approach for the emission spectra which takes into account the spatially and spectrally varying local density of optical states in a microcavity, loss due to free carrier absorption, and the coupling efficiency to an external optical system. The foundation of this approach is a three-dimensional finite element Maxwell solver that facilitates the computation of the cavity modes. The cavity modes complemented by a semi-analytic model for the radiative modes yield the emission spectra of the microcavity by means of an efficient mode expansion scheme. The effect of substrate reflection on the performance of photonic crystal microcavities is presented in a design study.
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Friedhard Römer and Bernd Witzigmann "Designing emission spectra of photonic crystal microcavities", Proc. SPIE 6901, Photonic Crystal Materials and Devices VII, 69010H (28 January 2008); doi: 10.1117/12.763406;

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