Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 10: Semiconductor Lasers I
HL 10.8: Vortrag
Montag, 20. März 2017, 11:45–12:00, POT 06
k-space engineering of laser modes in organic microcavities with photonic lattices — •Mona Kliem, Andreas Mischok, Hartmut Fröb, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, 01062 Dresden
Microcavities (MCs) offer a flexible playground to study photon and polariton dispersion in a tunable potential landscape. In vertical MCs, confined photons exhibit a parabolic dispersion relation and in turn behave similarly to other parabolic particles such as free electrons, albeit with an approx. 10−5 times smaller effective mass, leading to very low condensation and/or lasing thresholds. By adding a silver layer inside of an organic MC, we observe the formation of Tamm-plasmon-polariton states, shifting the cavity potential to lower energies. Consequently, patterning this thin silver layer enables us to manipulate the potential landscape and create periodic photonic lattices in 2D and 3D, exhibiting Bloch-like band structures in both kx and ky direction. The silver layer is photolithographically structured on top of a distributed Bragg reflector (DBR) to achieve micron-scale stripe-, hole- and dot-like patterns, arranged in square and hexagonal arrays before finishing the sample with a λ/2 active layer and top DBR. We study the effect of these photonic lattices on the full in-plane MC dispersion via tomographic micro-photoluminescence measurements and observe novel lasing modes at band edges of the resulting energy diagram. By choosing the right design parameters of the silver pattern we are able to directly engineer and control the lasing performance of our MCs.