We present ultrafast optical switching experiments on three-dimensional photonic band gap crystals. Switching the Si inverse opal is achieved by optically exciting free carriers by a two-photon process. We probe reflectivity in the frequency range of second order Bragg diffraction where the photonic band gap is predicted. We find good experimental switching conditions for free-carrier plasma fr...

This study was an attempt to provide a simple solution processed synthesis route for Lead Selenide (PbSe) nanostructure thin films using the chemical bath deposition (CBD) method which is commercially available in inexpensive precursors. In the CBD method, the preparation parameters play a considerable role and determine the nature of the final product formed. Known as two main factors, the eff...

Present study reports that Cd-Se nanoparticles with zinc blende structure allow Magnesium (Mg) Doping. Size tunable pure Cd-Se and Mg doped Cd-Se nanocrystal quantum dots were synthesized by inverse micelles technique. Paraffin oil and oleic acid were used as a solvent and surfactant respectively. Reduction in particles size with increase in Mg content is estimated from X-ray diffraction (XRD) ...

Graphyne and graphdiyne families of flat carbon (sp2/sp) networks with high degrees of π-conjunction are attracting much attention due to their promising electronic, optical, and mechanical properties. In the present investigation we have studied the structural, mechanical, electrical and optical properties of halogenated graphdiyne and graphyne. The optical spectra of pure and halog...