Abstract:ZnO:Mn semiconductor quantum dots were prepared by solution casting led microemulsion route. Quantum dots of average size ∼2 nm were noticed in transmission electron micrographs. The present work highlights colour change phenomena (photochromic effect) of quantum dots while subjected to photon illumination. The magneto-optic measurements e.g. magnetic field (H) vs angle of rotation (θ) show step like behavior and is ascribed to the quantum confinement effect of diluted magnetic ZnO:Mn nanostructures. Further, underlying mechanism responsible for exhibiting photochromism and magneto-optic effects are also discussed.
An experiment has been carried out to design a cost effective second harmonic microscope with a low power (2 mW) laser to reduce the possible damage of biological sample. The second order coefficients of different biological materials vary over an enormous range. Hence the harmonic microscope is expected to exhibit enormous contrast in biological specimens which show little or no detail in a conventional microscope. The second harmonic signal (SHS) is detected for a Potassium Dihydrogen Phosphate(KDP) crystal to establish the possibility of mapping through the SHS generated by a 2 mW laser. Finally a biological sample is used to detect SHS by the same method (Choudhury 1977; Yu et al.
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