Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.090
Publication date: 22nd December 2022
Perovskite nanocrystals are highly advantageous semiconductor materials for tailored light applications [1]. Large quantum yields, narrow emission and broad spectral tunability are only some of the unique optoelectronic properties at the center of their beneficial performance. On the other hand, flat patterned microstructures have emerged as powerful platforms for controlled light-matter interactions [2]. When asymmetrically shaped nano-objects are chosen as the unit cell of the array structure, these near-field interactions get dependent on the circular polarization state. Particularly nonlinear optoelectronic devices governed by multi-photon processes could benefit from such a near-field control.
With the aim to equip perovskite nanocrystals with chiral effects, we have built a hybrid perovskite-metasurface system [3]. A suitable chiral z-shaped Si nanoantenna array was coated with a monolayer of cubic all-inorganic lead halide perovskite nanocrystals. The nanoantenna array exhibits pronounced chiral resonances in the visible to IR region which allow to confine the excitation light in the fabricated nanostructures. We demonstrate that the chiral near-field interactions can serve to induce polarization effects in the two-photon absorption process of the perovskite nanocrystals. By tuning the thickness of the perovskite film down to one monolayer, we restricted the interactions exclusively to the near-field regime. We show that the layer’s two-photon excited luminescence is enhanced by up to one order of magnitude in this configuration. In particular, the enhancement is controllable by the excitation wavelength and by its polarization, revealing a pronounced fluorescence detected circular dichroism of the hybrid emitter-antenna system. Altogether, our findings present a pathway to control perovskite light emission via polarization sensitive near-field interactions, highlighting the potential of this hybrid system for sensing applications and display technologies.
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