Data obtained in optical trapping experiments with circularly polarized Laugerre-Gaussian beam with orbital number l = 2. Radius of the ring in the focus is equal R = 800 nm. The gold nanorods of mean length L = 180 nm and diameter D = 70 nm are trapped in water-glycerol solution of different concentrations for 0-40% weight percentage of glycerol. Inside the optical trap gold nanords are rotating around their center of mass and orbiting the beam. The motion of the particle is recorded using quadrant photo diode placed in Fourier plane of the microscope setup. The experimental setup and experimental procedure can be found in related publication, but the data in this data set are not part of this publication.
Optical setup description:
The 980 nm laser light comes from the Fiber Bragg Grating Stabilized Laser Diode (3S 1999CHP) driven by temperature stabilized driver (Thorlabs CLD1015). Light is outcoupled by the parabolic mirror collimator (Thorlabs RC08FC-P01), which creates a Gaussian beam. The beam passes through a quarter wave-plate, which changes its polarization into circular and then through m = 1 vortex retarder (Thorlabs WPV10L-980), which changes the beam into Laguerre-Gaussian beam with orbital number l = ±2. The LG beam goes through 50:50 non-polarizing beam splitter (Thorlabs BS014) and is focused using the 40x microscope objective (Olympus LUCPLFLN40X).
The water glycerin solution with gold nanorods (concentration ~0.1 pM) in placed between two microscope slides (thickness 1 mm and 0.17 mm) spaced with 0.12 mm spacer.
The sample is illuminated by LED and oil immersion dark field condenser with NA = 1.2-1.36. The light scattered by gold nanorods (both white light and 980 nm laser light) is collected by the microscope objective and through beam splitter it goes into the observation arm of the setup. The tube lens (Thorlabs TTL200-S8) is used to create an image. The flip mirror can direct the light on 1) camera (Flir Blackfly s U3 04S2M CS) placed at the image plane and preceded by the 950 nm short pass filter (Semrock FF01-950/SP-25); 2) the quadrant photo-diode (First Sensor QP50-6 SD 2) placed at the Fourier plane created by a Bertrand lens and preceded by a linear polarizer, data were recorded with frequency of QPD equal 262144 Hz.
The weight percentage of glycerol is equal 0, 10, 20, 30 and 40 %
Data were collected in January 2024, folder name describe date
20240104 - 10 and 20 %, laser power data
20240105 - 30 and 40 %
20240108 - pure water
(2024-01)
