Intersubband polaritons in a one-dimensional surface plasmon photonic crystal

• DOI: 10.1063/1.3524823
• Publication Date: 2010-12-11T15:33:58Z
• Authors: Simone Zanotto; Giorgio Biasiol; Riccardo Degl’Inn...; Lucia Sorba; Alessandro Tredic...
• Keywords: 0103 physical sciences; OPTICAL-PROPERTIES; 530; 01 natural sciences; 620

In this work we demonstrate the achievement of light-matter strong coupling regime between an intersubband transition and the photonic bandlike mode supported by a metallic grating. Polaritonic resonances have been identified in the reflectivity spectra at 10° incidence, with a clear anticrossing appearing when the photonic mode is tuned across the transition line. Experimental results are in good agreement with the simulations performed with a scattering-matrix approach. This cavity design can be further optimized and is likely to open the way to a new class of time-resolved measurements, as it allows pump-and-probe measurements to be performed in collinear geometries.