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arXiv · 1606.05090

Mid-Infrared intersubband polaritons in dispersive metal-insulator-metal resonators

Jean-Michel Manceau·Simone Zanotto·Tommaso Ongarello·Lucia Sorba·Alessandro Tredicucci·Giorgio Biasiol·Raffaele Colombelli
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Abstract

We demonstrate room-temperature strong-coupling between a mid-infrared ($λ$=9.9 $μ$m) intersubband transition and the fundamental cavity mode of a metal-insulator-metal resonator. Patterning of the resonator surface enables surface-coupling of the radiation and introduces an energy dispersion which can be probed with angle-resolved reflectivity. In particular, the polaritonic dispersion presents an accessible energy minimum at k=0 where - potentially - polaritons can accumulate. We also show that it is possible to maximize the coupling of photons into the polaritonic states and - simultaneously - to engineer the position of the minimum Rabi splitting at a desired value of the in-plane wavevector. This can be precisely accomplished via a simple post-processing technique. The results are confirmed using the temporal coupled mode theory formalism and their significance in the context of the concept of strong critical coupling is highlighted.

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Jean-Michel Manceau, Simone Zanotto, Tommaso Ongarello, Lucia Sorba, Alessandro Tredicucci, Giorgio Biasiol, Raffaele Colombelli. 2016-06-16. Mid-Infrared intersubband polaritons in dispersive metal-insulator-metal resonators. https://doi.org/10.1063/1.4893730

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