Ghosh, PiuePiueGhoshThambi, VarshaVarshaThambiKar, AshishAshishKarChakraborty, Arup LalArup LalChakrabortyKhatua, SaumyakantiSaumyakantiKhatua2025-08-312025-08-312021-09-1510.1364/OL.4352422-s2.0-85114961348http://repository.iitgn.ac.in/handle/IITG2025/2529234525047We demonstrate an easy and controllable method for light-induced active tuning of the longitudinal surface plasmon resonance (LSPR) of gold nanorods (AuNRs) over ∼94 nm. The red-shift of the LSPR can be controlled by varying the time of exposure to a 532 nm laser. The tuning is achieved by photo-induced dissolution of individual AuNRs by sodium dodecyl sulfate (SDS) under continuous illumination. The dissolution of the AuNRs increases the aspect ratio, and consequently the LSPR exhibits a gradual but large redshift. A key feature is that it is possible to selectively tune the LSPR of a specific AuNR in a group while leaving the others totally unaffected. Such controllable, light-induced, post-synthesis fine-tuning of the LSPR is useful for tailoring the plasmonic response of individual AuNRs for a wide range of applications.falseArticle153947944562-456515 September 20215arJournal6WOS:000696222700032