Angularly anisotropic tunability of upconversion luminescence by tuning plasmonic local-field responses in gold nanorods antennae with different configurations

Abstract

Optical polarization has attracted considerable research attention by extra detection dimension in angular space, flourishing modern optoelectronic applications. Nonetheless, purposive polarization controlling at nanoscales and even at the single-particle level constitutes a challenge. Plasmonic nanoantenna opens up new perspectives in polarization state modification. Herein, we report angular-dependent upconversion luminescence (UCL) of rare-earth ions doped upconversion nanoparticles (UCNPs) in both emission and excitation polarization via constructing angularly anisotropic plasmonic local-field distributions in gold nanorods (Au NRs) antennae with different configurations at a single-particle level. The UCL of UCNP tailored by plasmonic Au NRs nanoantennae is enhanced and exhibits linear polarization. The highest enhancement factor of 138 is obtained in the collinear Au NR-UCNP-Au NR configuration under parallel excitation. Simultaneously, the maximum degree of linear polarization (DOLP) of UCL with factors of 85% and 81% are achieved in the same structure in emission and excitation polarization measurements, respectively. The observed linear polarizations and UCL enhancements are due to varied resonant responses at 660 nm and the anisotropic near-field enhancement in different nanoantennae-load UCNP. The theoretical simulations reveal the periodic changing of near-field enhancement factors of nanoantennae in angular space with the incident light polarization angles and are well-matched with the experimental results.

Photoluminescence Mechanism of Dual‐State Emission Materials Based on the Sulfone Bridged Distyrylbenzene Derivative

“…R PL is estimated to be ∼0.50, which is higher than R abs (∼0.37). In comparison with the other inorganic crystals such as the eutectic of polynuclear lanthanide complexes and Ag clusters, [ 28 ] the rare‐earth ions doped upconversion nanoparticles, [ 29 ] the R PL of our organic crystals still own nice polarization properties. However, the previous research didn't further analyze the origin of their R PL .…”

Polarized upconversion emission at metasurface

“…Advancing the previous works reported by Wu 10 and Zeng 11 , towards the same direction, this report involved in the meticulous design of nanoantenna arrays utilizing surface plasmon resonance to achieve the desirable outcomes. While the current studies exhibit their strengths, they share certain limitations, such as the demanding requirements for precise fabrication and the intricate optical designs.…”

Aligned Plasmonic Antenna and Upconversion Nanoparticles toward Polarization-Sensitive Narrowband Photodetection and Imaging at 1550 nm

“…Only a few papers observed the distinct UC polarization anisotropy in individual NaYF 4 :Ln 3+ submicrometer/micrometer rods. Therefore, achieving tunable UC light polarization detection and imaging based on UCNPs remains a significant challenge due to the polarization insensitivity with geometric factors of UCNPs and the hardly achieved excellent alignment at a large scale of UCNPs. − Moreover, the relatively low UC emission efficiency and high pumping threshold of UCNP also restrict its performance in detection.…”