Size dependence of molecular fluorescence enhancement of nanoporous gold

Lang, X. Y.; Guan, P. F.; Zhang, L.; Fujita, T.; Chen, M. W.
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p073701
Academic Journal
We report molecular fluorescence enhancement of free-standing nanoporous gold with tunable nanopore size. The fluorescence intensity of indocynanine green adsorbed on human-serum-albumin-coated nanoporous gold films significantly increases with decreasing nanopore size. The large fluorescence enhancement results from the near-field enhanced excitation and radiative decay rate of fluorophore due to the strong electromagnetic fields produced by nanosized curvatures as well as the coupling between the neighbor gold ligaments.


Related Articles

  • Reaction of a Dislocation—Impurity System to an Electromagnetic Excitation. Alekseenko, V. I. // Technical Physics;Jun2000, Vol. 45 Issue 6, p732 

    In experiments on indium antimonide single crystals, the dynamic behavior of a screw dislocationimpurity ambient system was studied. It was found that local absorption of electromagnetic energy takes place in this system, leading to development of relaxation processes which change the system...

  • Electromagnetically induced transparency mediated by phonons in strongly coupled exciton—phonon systems. Zhu, K.-D.; Li, W.-S. // Applied Physics B: Lasers & Optics;2002, Vol. 75 Issue 8, p861 

    It is shown theoretically that electromagnetically induced transparency (EIT) due to strong exciton-phonon coupling can occur in strongly coupled exciton-phonon systems such as polymers and organic semiconductors and lead to ultra-slow light effects. The results indicate that the strong coupling...

  • Giant exciton-light coupling in ZnO quantum dots. Gil, Bernard; Kavokin, Alexey V. // Applied Physics Letters;7/22/2002, Vol. 81 Issue 4, p748 

    We investigate the strength of the coupling of the electronic states with the electromagnetic field in ZnO nanospheres, taking into account the retardation effect. We show that the coupling strength is particularly strong: the bulk properties are so enhanced that the radiative decay time can...

  • Triplet exciton fusion at dislocations in anthracene. Yokoi, K.; Ohba, Y. // Journal of Chemical Physics;8/1/1987, Vol. 87 Issue 3, p1887 

    The fusion reaction of triplet excitons trapped at edge dislocations (001)[010] was studied in anthracene crystals by observing delayed fluorescence. The fusion rate obtained by kinetic analysis which includes the exciton-trapping effect is about unity measured in cm3 s-1, which is much greater...

  • Ultrafast photoluminescence in silicon nanocrystals studied by femtosecond up-conversion technique. Trojánek, F.; Neudert, K.; Malý, P.; Dohnalová, K.; Pelant, I. // Journal of Applied Physics;6/1/2006, Vol. 99 Issue 11, p116108 

    Photoluminescence dynamics in silicon nanocrystals measured by a femtosecond up-conversion technique are reported. The samples were prepared by embedding porous silicon grains in a sol-gel derived SiO2 matrix. Efficient initial relaxation of the excess energy of photoexcited carriers with the...

  • Flow of electrolytes in a porous medium. Shelukhin, V. V.; Amirat, Yu. // Journal of Applied Mechanics & Technical Physics;Jul2008, Vol. 49 Issue 4, p655 

    A two-scale model of ion transfer in a porous medium is obtained for one-dimensional horizontal flows under the action of a pressure gradient and an external electric field by the method of homogenization. Steady equations of electroosmotic flows in flat horizontal nano-sized slits separated by...

  • Localized, low-voltage electro-osmotic pumping across nanoporous membranes. Gupta, A.; Denver, H.; Hirsa, A. H.; Stenken, J. A.; Borca-Tasciuc, D.-A. // Applied Physics Letters;8/27/2007, Vol. 91 Issue 9, p094101 

    This work demonstrates the principle of localized, low-voltage, continuous current electro-osmotic pumping across thin membranes. Localization of the pumping effect is obtained by employing ring electrodes, microfabricated on each side of nanoporous alumina membranes. Low voltage actuation is...

  • Mechanoelectromagnetic interaction in isotropic dielectrics with regard for the local displacement of mass. Kondrat, V. F.; Hrytsyna, O. R. // Journal of Mathematical Sciences;Aug2010, Vol. 168 Issue 5, p688 

    On the basis of the earlier proposed model of electromagnetothermomechanics of polarizable bodies, which takes into account the process of local displacement of mass, key equations for the corresponding scalar and vector potentials are written. The generalization of the Lorentz gauge, at which...

  • Influence of High-k Gate Dielectric on Nanoscale DG-MOSFET. Mohapatra, S. K.; Pradhan, K. P.; Sahu, P. K. // International Journal of Advanced Science & Technology;Apr2014, Vol. 65, p19 

    Influence of dielectric materials as gate oxide on various short channel device parameters using a 2-D device simulator has been studied in this paper. It is found that the use of high-k dielectrics directly on the silicon wafer would degrade the performance. This degradation is mainly due to...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics