Nonlinear optical effects in trapping nanoparticles with femtosecond pulses

Tweezing and manipulating micro- and nanoparticles by optical nonlinear endoscopy

“…29 In addition, the power density of the trapping beam in Figure 3 is three orders of magnitude lower than the threshold of generating nonlinear polarization in gold nanoparticles trapped by a high NA objective. 30 Our experiment also fundamentally differs from the photothermal trapping of dielectric microparticles induced by high-power direct laser heating in water. 31 Our observations are directly related to the field enhancement caused by the surface plasmon resonance of gold nanorods under two-photon absorption by a low power beam and the subsequent environmental temperature increase caused by heating the nanorods trapped within the focal region.…”

Spiral attractor created by vector solitons

“…As a result, a new chaotic attractor has been reproduced theoretically for parameters close to the experimental ones. By unveiling the origin of new types of unique states of polarisation evolving on very complex trajectories, our theoretical and experimental studies pave the way to new techniques in metrology, 14 high-resolution femtosecond spectroscopy, 15 high-speed and secure fibre optic communications, 16,21 nanooptics (trapping and manipulation of nanoparticle and atoms [17][18][19] ) and spintronics (vector control of magnetisation 20 ). With further advances in the development of fast polarimetry in the context of speed (.1 GHz) and the number of stored samples (.10 M samples), the mode-locked laser with polarisation controller will become a demonstrator of the complex dynamics including dynamic chaos like a generic Chua circuit.…”

“…[4][5][6][7][8][9][10][11][12][13] The stability of VSs at the different time scales from femtosecond to microseconds is an important issue to be addressed for increased resolution in metrology, 14 spectroscopy 15 and suppressed phase noise in high speed fibre optic communication. 16 In addition, there is considerable interest in achieving high flexibility in the generation and control of dynamic SOPs in the context of trapping and manipulation of atoms and nanoparticles, [17][18][19] control of magnetisation 20 and secure communications. 21 The stability and evolution of VSs at a time interval from a few to thousands of cavity round trips is defined by asymptotic states (attractors) which the laser SOP approaches at a long time scale, viz.…”

Simultaneous control of optical dipole force and coherence creation by super-Gaussian femtosecond pulses inΛ-like atomic systems

“…Optical force due to light, particularly laser beam, on particles such as atoms, molecules, ions etc. have been successfully exploited in as diverse areas as optical tweezers [3], atom optics [4], Bose-Einstein condensation [5], quantum information [6], etc. Many authors have studied the radiation forces exerted on neutral atoms [7][8][9][10][11][12].…”

“…In this context several studies have been reported. For example, optical force on two-level atoms by subcycle pulsed focused vector fields [13], light force on a beam of neutral two-level atoms superimposed upon a few-cycle pulsed Gaussian laser field under both resonant and off-resonant condition [14], optical dipole force on ladder-like three-level atomic systems induced by few-cycle-pulse laser fields [15], near resonant optical force [16] and trapping of nanoparticles with femtosecond pulses [3].…”