Control of Loss in Nanoplasmonics

Event Date: April 4, 2008
Speaker: Dr Mikhail A. Noginov
Speaker Affiliation: Norfolk State University
Sponsor: Nanotechnology Seminar
Time: 10:00 AM
Location: Birck Nanotechnology Center, Room 1001
Contact Name: Evgenii Narimanov
Contact Phone: 765-494-1622
Contact Email: evgenii@purdue.edu
Open To: ACCEPTABLE FOR ECE694A

Localized surface plasmons (SPs), resonant oscillations of free electrons in metallic nanostructures, and surface plasmon polaritons (SPPs), special type of electromagnetic waves coupled to electron density oscillations, comprise a very hot topic in modern photonic research. Surface plasmons have been named an enabling mechanism in a number of unique optical phenomena, including surface-enhanced Raman spectroscopy, extraordinary optical transmission and negative index of refraction. They are broadly used in photonic and optoelectronic devices, including waveguides, couplers, splitters, add/drop filters, and quantum cascade lasers.

Unfortunately, many applications of surface plasmons suffer from damping caused by absorption in metals. Over the years, several proposals have been made to compensate loss in localized and propagating surface plasmons by incorporating optical gain into dielectric medium. We have experimentally demonstrated conquering of surface plasmon loss by optical gain and demonstrated stimulated emission of surface plasmon polaritons. In addition, we show the possibility of reducing the loss in metal without gain, via modification of its electronic states due to presence of adjacent dye-doped polymer.

HOST:  Evgenii Narimanov