Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 86: Photonic crystals and cavities

HL 86.5: Vortrag

Donnerstag, 3. April 2014, 10:30–10:45, POT 051

Thermo-optical response of photonic crystal cavity resonances — •Niko Nikolay1, Janik Wolters1, Max Schoengen2, Andreas Schell1, Jürgen Probst2, Bernd Löchel2, and Oliver Benson11Nano-Optics, Institute of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, D-12489 Berlin, Germany — 2Institute for Nanometre Optics and Technology, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, D-12489 Berlin, Germany

Two-dimensional photonic crystal cavities are promising candidates for scalable integrated optical devices. Hence, they have increasing importance for quantum optics, photonics and sensing applications [1,2]. We focus on thermo-optical effects in photonic crystal slab resonators made of gallium phosphide. The thermal shift of the resonance wavelength and the underlying change of the refractive index are explored. An increased Q-factor is observed at low temperatures. Our results are the first systematic study of these properties over the wide temperature range between 5 and 300 K at a wavelength of about 605 nm [3]. In addition, experimental studies and theoretical analysis of thermo-optical switching of visible light by local heating of ultra-small attoliter volumes are discussed.

[1] Vahala, Nature 424, 839-846 (2003), doi:10.1038/nature01939

[2] Wolters et al., APL 97, 141108 (2010), doi:10.1063/1.3499300

[3] Wolters et al., Nanotech. 24, 315204 (2013), doi:10.1088/0957-4484/24/31/315204

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