Photonic Nanojets in Optical Tweezers
arXiv:1502.01315 · doi:10.1016/j.jqsrt.2015.03.019
Abstract
Photonic nanojets have been brought into attention ten years ago for potential application in ultramicroscopy, because of its sub-wavelength resolution that can enhance detection and interaction with matter. For these novel applications under development, the optical trapping of a sphere acts as an ideal framework to employ photonic nanojets. In the present study, we generated nanojets by using a highly focused incident beam, in contrast to traditional plane waves. The method inherits the advantage of optical trapping, especially for intracellular applications, with the microsphere in equilibrium on the beam propagation axis and positioned arbitrarily in space. Moreover, owing to optical scattering forces, when the sphere is in equilibrium, its center shifts with respect to the focal point of the incident beam. However, when the system is in stable equilibrium with a configuration involving optical tweezers, photonic nanojets cannot be formed. To overcome this issue, we employed double optical tweezers in an unorthodox configuration involving two collinear and co-propagating beams, the precise positioning of which would turn on/off the photonic nanojets, thereby improving the applicability of photonic nanojets.
arXiv comment10th International Conference Series on Laser-Light and Interactions with Particles (Marseilles, 2014)
References in corpus (9)
- Locomotion of microspheres for super-resolution imaging
- Analytical results for a Bessel function times Legendre polynomials class integrals
- Exact Partial Wave Expansion of Optical Beams with Respect to an Arbitrary Origin
- Electromagnetic forces for an arbitrary optical trapping of a spherical dielectric
- Photothermal Single Particle Microscopy
- Axially symmetric focusing as a cuspoid diffraction catastrophe: Scalar and vector cases and comparison with the theory of Mie
- Effect of finite terms on the truncation error of Mie series
- Optical forces on cylinders near subwavelength slits illuminated by a photonic nanojet
- Nonstationary photonic jet from dielectric microsphere