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Koenderink A.F.,FOM Institute for Atomic and Molecular Physics
Optics Letters | Year: 2010

The Purcell factor is the standard figure of merit for spontaneous emission enhancement in microcavities and has also been proposed to describe emission enhancements for plasmonic resonances. A comparison of quality factor, mode volume, and Purcell factor for single and coupled plasmon spheres to exact calculations of emission rates shows that a Purcell factor derived from quality factor and mode volume does not describe emission changes due to plasmon antennas. © 2010 Optical Society of America. Source


Bakker H.J.,FOM Institute for Atomic and Molecular Physics | Skinner J.L.,University of Wisconsin - Madison
Chemical Reviews | Year: 2010

The experimental technique of vibrational spectroscopy and the role that it has played in elucidating the structure and dynamics of liquid water in thermal equilibrium was investigated. Considering first the Raman line shapes, theoretical analysis indicates that the shoulder on the blue side is due to HOD molecules lacking an H-bond to the H/D atom for HDO:D2O/HDO:H 2O, respectively. The spectral diffusion observables provide quite direct information about the frequency-frequency time-correlation function. Integrated three-pulse echo-peak shift experiments show that the correlation function has an initial inertial time decay within 50 fs, a recurrence indicative of an underdamped oscillation at about 180 fs, and a long-time decay with a time constant of about 1.4 ps. As in the case of liquid water, the exquisite sensitivity of OH stretch vibrational frequencies to local environments, coupled with the excellent time and frequency resolution of modern ultrafast vibrational spectroscopy, make this an excellent technique for unraveling complicated structural and dynamical issues. Source


Dogterom M.,FOM Institute for Atomic and Molecular Physics
Current opinion in cell biology | Year: 2013

Microtubules organize into a set of distinct patterns with the help of associated molecules that control nucleation, polymerization, crosslinking, and transport. These patterns, alone or in combination with each other, define the functional architecture of the microtubule cytoskeleton in living cells. In vitro experiments of increasing complexity help understand, in combination with theoretical models, the basic mechanisms by which elementary microtubule patterns arise, how they are maintained, and how they position themselves with respect to the confining geometry of living cells. Copyright © 2012 Elsevier Ltd. All rights reserved. Source


Atwater H.A.,California Institute of Technology | Polman A.,FOM Institute for Atomic and Molecular Physics
Nature Materials | Year: 2010

The emerging field of plasmonics has yielded methods for guiding and localizing light at the nanoscale, well below the scale of the wavelength of light in free space. Now plasmonics researchers are turning their attention to photovoltaics, where design approaches based on plasmonics can be used to improve absorption in photovoltaic devices, permitting a considerable reduction in the physical thickness of solar photovoltaic absorber layers, and yielding new options for solar-cell design. In this review, we survey recent advances at the intersection of plasmonics and photovoltaics and offer an outlook on the future of solar cells based on these principles. Source


Polman A.,FOM Institute for Atomic and Molecular Physics
ACS Nano | Year: 2013

Silica-gold core-shell nanoparticles that are immersed in water act as efficient nanoscale generators of steam when illuminated with sunlight. In their paper in this issue of ACS Nano, Halas, Nordlander, and co-workers demonstrate this intriguing phenomenon that results from the nucleation of steam at the surface of individual nanoparticles that are heated by the sun. The same effect is also used to demonstrate distillation of ethanol. The solar steam nanobubble generation phenomenon results from the complex interplay of many different phenomena that occur at the nanoscale, and can find a broad range of applications. © 2013 American Chemical Society. Source

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