Single-molecule detection has long relied on fluorescent labeling with high quantum-yield
fluorophores. Plasmon-enhanced detection circumvents the need for labeling by allowing …

1. INTRODUCTION Detection of chemical and biological agents plays a fundamental role in
biomedical, forensic and environmental sciences 1− 4 as well as in anti bioterrorism …

This review provides a comprehensive description of nonlinear optical (NLO) properties of
gold nanoparticles, which can be used in biological applications. The main focus is placed …

Since the first report on the far-field optical detection of single metal nanoparticles in the late
1990s, the field has rapidly developed and new methods and concepts have been …

Photoinduced light emission from plasmonic nanoparticles has attracted considerable
interest within the scientific community because of its potential applications in sensing …

We study the luminescence quantum yield (QY) of single gold nanorods with different aspect
ratios and volumes. Compared to gold nanospheres, we observe an increase of QY by …

We report on the one-photon photoluminescence of gold nanorods with different aspect
ratios. We measured photoluminescence and scattering spectra from 82 gold nanorods …

A strong intrinsic signal is advantageous over labeling for optical detection of nanoparticles.
Intense scattering and absorption by the surface plasmon resonance, which exceeds …

The photothermal (PT) signal arises from slight changes of the index of refraction in a
sample due to absorption of a heating light beam. Refractive index changes are measured …

Fluorescent gold nanoparticles with high quantum yield are highly desirable for optical
imaging in the fields of biology and materials science. We investigate the one-photon …