Electric Field in Metal Nanoparticle Dimers

Metal nanoparticles exhibit localized surface plasmon resonance (LSPR). One can think of LSPR as resonance of¬†electron sea oscillations driven by incident electric field. This is similar to the way a spring-mass system attains resonance under external periodic driving force. The result of this plasmon resonance is enhanced dipole moment or charge separation, which leads to 1) large extinction (extinction is defined as sum of scattering and absorption) and 2) large electric field near the particle. Both of which are shape, size and surrounding dependent. Researchers have taken advantage of this large electric field localization to enhance Raman signals from molecules Read More …

Artificial Molecular Muscles drive Microcantilevers

The collective motions induced by oxidation and reduction of 8 billion muscle molecules are harnessed to perform mechanical work on a microcantilevers. The use of the cooperative forces generated by these self-assembled, nanometer-scale artificial molecular muscles that are electrically wired to an external power supply constitutes a seminal step toward molecular-machine-based nanoelectromechanical systems (NEMS). This work of ours is reported in issue 3 of ACS Nano journal.  Article can be downloaded from my publications page.