Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 69: Poster: Quantum Systems

DY 69.16: Poster

Donnerstag, 15. März 2018, 15:30–18:00, Poster A

Optical microcavities for nanoparticle sensing — •Jakob Kreismann and Martina Hentschel — Technische Universität Ilmenau, Institut für Physik, Weimarer Str. 25, 98693 Ilmenau

Optical microcavties play an important role in nanophoptonic innovations and applications. Detection of nanoparticles or even single molecules is already a feasible method, for example by employing the resonant frequency shift due to the interaction of the particles with the evanescent field of a whispering gallery mode confined in a micro toroid or a micro sphere resonator. Usually these devices are designed to detect particles that attach on the side wall of the resonator. Here, we investigate a sensing method where particles can attach on the top surface, thereby overcoming the drawback of the small area of the side surface. We compare various, regular and chaotic, cavity geometries. The chaotic dynamics of the Limacon-shaped resonator are crucial to realize a broad field distribution along the top surface[1]. We perform three dimensional FDTD calculations to optimize the geometry by increasing the sensitive area surrounded by the evanescent field and characterize the sensing properties.

[1] J. Kreismann, S. Sinzinger, and M. Hentschel, Phys. Rev. A 95, 011801(R) (2017).