Low-Loss Plasmonics with Nanostructured Potassium and Sodium-Potassium Liquid Alloys.
Nano Lett
; 23(15): 7150-7156, 2023 Aug 09.
Article
de En
| MEDLINE
| ID: mdl-37477493
ABSTRACT
Alkali metals have low optical losses in the visible to near-infrared (NIR) compared with noble metals. However, their high reactivity prohibits the exploration of their optical properties. Recently sodium (Na) has been experimentally demonstrated as a low-loss plasmonic material. Here we report on a thermo-assisted nanoscale embossing (TANE) technique for fabricating plasmonic nanostructures from pure potassium (K) and NaK liquid alloys. We show high-quality-factor resonances from K as narrow as 15 nm in the NIR, which we attribute to the high material quality and low optical loss. We further demonstrate liquid Na-K plasmonics by exploiting the Na-K eutectic phase diagram. Our study expands the material library for alkali metal plasmonics and liquid plasmonics, potentially enabling a range of new material platforms for active metamaterials and photonic devices.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Nano Lett
Année:
2023
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique