Tunable giant Goos-Hänchen shift in Au-ReS2-graphene heterostructure.

Enhancing and flexibly controlling the Goos-Hänchen (GH) shift directly is a significant challenge. Here, we report a tunable giant GH shift in a Au-ReS2-graphene heterostructure. The GH shift of this heterostructure demonstrates strong anisotropy and a unique "sign inversion" feature as the graphene reaches a specific thickness. Flexible control and enhancement of the GH shift to the centimeter scale can be achieved by simply rotating the crystallization direction of the heterostructure. Utilizing this feature, we designed an anisotropic refractive index sensor with a high sensitivity of 1.31 × 108 µm/RIU. This marks an order of magnitude improvement over previous research and introduces a rotation-dependent sensitivity adjustment feature. The tunable giant GH shift provides a promising approach for future designs of optical sensing and modulation devices.

Biopolymer-based supramolecular micelles from ß-cyclodextrin and methylcellulose.

Supramolecular polymer micelles (SMPMs) were constructed from natural and natural-derived polymers: ß-cyclodextrin (ß-CD)/maleic anhydride modified ß-cyclodextrin (MAh-ß-CD) and methylcellulose (MC) in aqueous solution by one-pot self-assembly procedure, in which, ß-CD and MAh-ß-CD inclusion complexes were used as the hydrophilic shell and the free MC as the core. The shapes of the SMPMs were regular spheres with diameters of 25±5 nm. The critical micelle concentrations, calculated from steady-state fluorescence emission spectra, were around 15.13 and 20.89 mg/L for MC/ß-CD and MC/MAh-ß-CD SMPMs, respectively. The in vitro drug release behaviors of the micelles were studied using prednisone acetate as a model drug, and the results showed that the MC/MAh-ß-CD micelle had a drug-enrichment core and excellent drug released behaviors with a sustaining release time of 700 h.