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We demonstrate detection and sizing of single nanoparticles down to 30 nm by monitoring the mode splitting induced by a nanoparticle in an ultra-high quality factor (UHQ) microtoroid. Theory and methods are discussed.
We reconstruct the magnetic near-field and source current distribution of a linear coupled-dipole IR optical antenna from the complete 3D electric vector near-field as probed using scattering-type scanning near-field optical microscopy. Fine details associated with antenna coupling are observed.
We describe the different optical responses of geometrically related metamaterials with an analytical method based on multipoles. Metamaterials affecting the polarization eigenstates or mimicking EIT-like phenomena can be understood and explained on simple analytical grounds.
We study second-order complex Padé approximants that give a systematic approach to time-domain modeling of dispersive dielectric functions including the classical Drude, Lorentz, Sellmeier and the critical points models. The approach is utilized to compare the frequency domain with time-domain simulations of local optical responses and transmission-reflection spectra for plasmonic nanostructures...
We present Brillouin confocal microscopy with high throughput and high extinction for non-invasive mechanical measurements of tissue and biomaterials. In particular, we demonstrate biomechanical characterization of crystalline lens and cornea.
Scattering induced mode splitting in microcavities with gain medium is detected directly using heterodyne technique without wavelength scan around resonant modes. Optical gain helps resolve small mode splittings, which might be missed in passive microcavities.
Optical dipole antennas with varying length and width are fabricated using e-beam lithography. Antennas with wider width are shown to exhibit stronger scattering while preserving the same resonance frequency.
We show that anomalous-even repulsive-force fields can be induced around high-contrast optical nanowaveguides. Interestingly the longitudinal scattering force attains a maximum value even within regions where the Poynting vector is negative.
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