منابع مشابه
Laser threshold of Mie resonances.
We show that time-independent scattering coefficients calculated from the standard extrapolation of Mie theory to the gain regime have physical meaning up to the laser threshold. The theoretical width of a resonance decreases linearly with increasing gain and becomes zero at the laser threshold. We performed experiments on dielectric microspheres with gain, trapped with optical tweezers. The wi...
متن کاملUniform approximation to Mie resonances
Uniform asymptotic approximations for the positions and widths of Mie resonances are reported . The results improve the accuracy of previous approximations, typically, by several orders of magnitude . They are suitable for fast numerical evaluation, allowing every resonance to be located well within its width, for all resonances of practical interest . The relative errors are very small even fo...
متن کاملMie resonances and bonding in photonic crystals
(received ; accepted) PACS. 42.25Fx – Diffraction and scattering. PACS. 42.70Qs – Photonic bandgap materials. PACS. 42.65Vh – Other non-linear optical phenomena. Abstract. – Isolated dielectric spheres support resonant electromagnetic modes which are analogous to electronic orbitals and, like their electronic counterparts, can form bonding or anti-bonding interactions between neighbouring spher...
متن کاملThe effect of Mie resonances on trapping in optical tweezers.
We calculate trapping forces, trap stiffness and interference effects for spherical particles in optical tweezers using electromagnetic theory. We show the dependence of these on relative refractive index and particle size. We investigate resonance effects, especially in high refractive index particles where interference effects are expected to be strongest. We also show how these simulations c...
متن کاملManifestations of morphology-dependent resonances in Mie scattering matrices
Lorenz±Mie computations of the extinction cross-section for monodisperse spheres show the existence of a very complex structure that includes extremely narrow peaks called morphology-dependent resonances (MDRs). The width and magnitude of the peaks are highly sensitive functions of the size parameter and the refractive index of the sphere. So far the MDRs have been calculated and observed mostl...
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ژورنال
عنوان ژورنال: Optics Letters
سال: 2006
ISSN: 0146-9592,1539-4794
DOI: 10.1364/ol.31.001432