Helmholtz Resonator Applied to Nanocrystal-Based Infrared Sensing
Claire Abadie, Laura Paggi, Alice Fabas, Adrien Khalili, Tung Huu Dang, Corentin Dabard, Mariarosa Cavallo, Rodolphe Alchaar, Huichen Zhang, Yoann Prado, Nathalie Bardou, Christophe Dupuis, Xiang Xu, Sandrine Ithurria, Debora Pierucci, James K. Utterback, Baptiste Fix, Grégory Vincent, Patrick Bouchon, Emmanuel Lhuillier
Abstract
While the integration of nanocrystals as an active medium for optoelectronic devices progresses, light management strategies are becoming required. Over recent years, several photonic structures (plasmons, cavities, mirrors, etc.) have been coupled to nanocrystal films to shape the absorption spectrum, tune the directionality, and so on. Here, we explore a photonic equivalent of the acoustic Helmholtz resonator and propose a design that can easily be fabricated. This geometry combines a strong electromagnetic field magnification and a narrow channel width compatible with efficient charge conduction despite hopping conduction. At 80 K, the device reaches a responsivity above 1 A·W–1 and a detectivity above 1011 Jones (3 μm cutoff) while offering a significantly faster time-response than vertical geometry diodes.