MUMBAI, India, Feb. 27 -- Intellectual Property India has published a patent application (202641019268 A) filed by Dr. Karunakar Shakampally; Dr. Ashish Tiwari; Dr. C. Kalyani; Dr. M. C. Rao; D. Venkata Lakshmi; Dr. J. Bhuvana; Mrs. S. Aruljothi; and Dr. Lavanya Dhevi R, Ghatkesar, Telangana, on Feb. 19, for 'plasmonic nanostructure for enhanced optical properties.'

Inventor(s) include Dr. Karunakar Shakampally; Dr. Ashish Tiwari; Dr. C. Kalyani; Dr. M. C. Rao; D. Venkata Lakshmi; Dr. J. Bhuvana; Mrs. S. Aruljothi; and Dr. Lavanya Dhevi R.

The application for the patent was published on Feb. 27, under issue no. 09/2026.

According to the abstract released by the Intellectual Property India: "The present invention provides a plasmonic nanostructure and method for fabrication thereof, designed to significantly enhance optical properties such as photoluminescence, light absorption, and nonlinear optical responses. The nanostructure comprises a substrate (101) supporting a metallic nanostructure array (102), such as a nanogroove array or non-spherical nanoparticles, which is configured to support surface plasmon resonances. An active two-dimensional (2D) material layer (103), for example, a transition metal dichalcogenide (TMDC) monolayer like WS2, is disposed on the metallic nanostructure array. The geometry of the metallic nanostructure array is engineered to create highly confined electromagnetic fields ("hot spots") that interact strongly with the active 2D material layer (103), leading to a significant enhancement of its optical properties via plasmon-exciton coupling mechanisms, which can range from weak Purcell enhancement to intermediate or strong coupling regimes resulting in Rabi splitting. The invention overcomes limitations of prior art by providing a scalable structure that yields high enhancement factors, tunable multi-band operation, and applicability in various optoelectronic devices. Fabrication involves lithographic patterning of the metal array followed by transfer of the 2D material. The disclosed nanostructure finds utility in high-sensitivity biosensing, efficient photodetectors, ultrafast optical switches, broadband optical limiters, and enhanced photovoltaic cells."

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