scholarly journals Fresnel Lens with Embedded Vortices

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Sunil Vyas ◽  
Rakesh Kumar Singh ◽  
Devinder Pal Ghai ◽  
P. Senthilkumaran
Keyword(s):  
Intensity Distribution ◽  
Focal Plane ◽  
Spatial Light Modulator ◽  
Phase Variation ◽  
Fresnel Lens ◽  
Light Modulator ◽  
Quadratic Phase ◽  
Topological Charges

Vortices of different charges are embedded in a wavefront that has quadratic phase variation, and the intensity distribution near the focal plane is studied. This method may be useful in realizing complicated beam profiles. We have experimentally demonstrated the generation of vortex arrays having integer as well as fractional topological charges that produce different intensity profiles at the focal plane. The phase variation realized on a spatial light modulator (SLM) acts as a Fresnel lens with embedded vortices.

scholarly journals Sagnac Interferometer Based Generation of Controllable Cylindrical Vector Beams

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Cristian Acevedo ◽  
Angela Guzmán ◽  
Yezid Torres Moreno ◽  
Aristide Dogariu
Keyword(s):  
Spatial Light Modulator ◽  
Continuous Control ◽  
Sagnac Interferometer ◽  
Light Modulator ◽  
Polarized Beams ◽  
Vector Beams ◽  
Computer Generated Holograms ◽  
Orthogonal Beams ◽  
Experimental Geometry ◽  
Topological Charges

We report on a novel experimental geometry to generate cylindrical vector beams in a very robust manner. Continuous control of beams’ properties is obtained using an optically addressable spatial light modulator incorporated into a Sagnac interferometer. Forked computer-generated holograms allow introducing different topological charges while orthogonally polarized beams within the interferometer permit encoding the spatial distribution of polarization. We also demonstrate the generation of complex waveforms obtained by combining two orthogonal beams having both radial modulations and azimuthal dislocations.

scholarly journals Generation of Optical Vortices by Linear Phase Ramps

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Sunil Vyas
Keyword(s):  
Numerical Simulation ◽  
Intensity Distribution ◽  
Spatial Light Modulator ◽  
Phase Mask ◽  
Computational Techniques ◽  
Optical Vortices ◽  
Vortex Generation ◽  
Linear Phase ◽  
Light Modulator ◽  
Phase Discontinuity

Generation of optical vortices using linear phase ramps is experimentally demonstrated. When two regions of a wavefront have opposite phase gradients then along the line of phase discontinuity vortices can be generated. It is shown that vortices can evolve during propagation even with the unequal magnitude of tilt in the two regions of the wavefront. The number of vortices and their location depend upon the magnitude of tilt. vortex generation is experimentally realized by encoding phase mask on spatial light modulator and their presence is detected interferometrically. Numerical simulation has been performed to calculate the diffracted intensity distribution from the phase mask, and presence of vortices in the diffracted field is detected by computational techniques.

scholarly journals Experimental realization of the devil’s vortex Fresnel lens with a programmable spatial light modulator

2012 ◽  
Vol 51 (18) ◽  
pp. 4103 ◽  
Author(s):  
Mark Mitry ◽  
Danielle C. Doughty ◽  
Jan L. Chaloupka ◽  
Matthew E. Anderson
Keyword(s):  
Spatial Light Modulator ◽  
Fresnel Lens ◽  
Light Modulator ◽  
Experimental Realization

Polymer-Stabilized Blue-Phase Liquid Crystal Fresnel Lens Cured With Patterned Light Using a Spatial Light Modulator

2016 ◽  
Vol 12 (10) ◽  
pp. 1008-1012 ◽  
Author(s):  
Na Rong ◽  
Yan Li ◽  
Xiao Li ◽  
Pengcheng Zhou ◽  
Shuxin Liu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Fresnel Lens ◽  
Light Modulator ◽  
Phase Liquid ◽  
Blue Phase ◽  
Polymer Stabilized

Research on Axial Multi-Focus Scanning in Confocal Microscopy with Liquid Crystal Spatial Light Modulator

2017 ◽  
Vol 870 ◽  
pp. 27-33
Author(s):  
Li Min Zou ◽  
Meng Jiao Zhou ◽  
Bao Kai Wang ◽  
Xue Mei Ding
Keyword(s):  
Liquid Crystal ◽  
Confocal Microscopy ◽  
Spatial Light Modulator ◽  
Fresnel Lens ◽  
Light Modulator ◽  
Scanning Method ◽  
Mechanical Parts ◽  
Fixed Sample ◽  
Novel Method ◽  
Axial Scanning

In this paper, a non-mechanical axial zoom scanning method based on a phase only liquid crystal spatial light modulator is proposed. This novel method is to overcome the measurement error caused by moving mechanical parts in the axial mechanical scanning methods in the confocal microscopy system. The modulation on the incident wave front is completed by a spatial light modulator, which provides this scanning method some outstanding advantages including the flexibility of control and the absence of moving mechanical parts, especially suitable for the fixed sample imaging occasions. By simulating the multiple Fresnel lens with LCSLM to generate controllable multi-focal points and thus realizing this method of axial multi-focus scanning to enhance the axial scanning efficiency and the range. Simulations and experiments on the axial scanning features of the axial multi-focus zoom scanning method are carried out. Results of simulations and experiments indicate that non-mechanical axial zoom scanning can be realized with the use of a spatial light modulator in the confocal microscopy system.

scholarly journals Efficient Multifocal Structured Illumination Microscopy Utilizing a Spatial Light Modulator

2020 ◽  
Vol 10 (12) ◽  
pp. 4396
Author(s):  
Liang Feng ◽  
Xiaolei Wang ◽  
Xinlei Sun ◽  
Sende Wang ◽  
Lie Lin ◽  
...  
Keyword(s):  
Focal Plane ◽  
Spatial Light Modulator ◽  
Present System ◽  
Wide Field ◽  
Structured Illumination ◽  
Structured Illumination Microscopy ◽  
Light Modulator ◽  
Reconstruction Procedure ◽  
Efficient System ◽  
Phase Plates

We demonstrated an efficient system for multifocal structured illumination microscopy (MSIM) utilizing a spatial light modulator (SLM). Nine phase profiles of chessboard phase plates loaded on the SLM in sequence are used to generate nine multifocal arrays on the focal plane. Subsequently, nine raw multifocal images are acquired. Finally, by extracting the parameters of the illumination patterns from the raw images precisely, a final super-resolved image is reconstructed by performing the standard reconstruction procedure of structured illumination microscopy (SIM). Our MSIM system realized nearly a 1.5-fold enhancement in spatial resolution compared with wide-field (WF) microscopy. The feasibility of the present system is validated on experiments and the results show its great performances along with good compatibility.

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