scholarly journals Diffraction limited photonic hook via scattering and diffraction of dual-dielectric structures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Victor Pacheco-Peña ◽  
Joseph Arnold Riley ◽  
Cheng-Yang Liu ◽  
Oleg V. Minin ◽  
Igor V. Minin
Keyword(s):  
Refractive Index ◽  
Excellent Agreement ◽  
Free Space ◽  
Optical Trapping ◽  
Structured Light ◽  
Dielectric Structure ◽  
Output Surface ◽  
Propagation Axis ◽  
Light Beams ◽  
Dielectric Structures

AbstractPhotonic hooks have demonstrated to be great candidates for multiple applications ranging from sensing up to optical trapping. In this work, we propose a mechanism to produce such bent structured light beams by exploiting the diffraction and scattering generated by a pair of dielectric rectangles immersed in free space. It is shown how the photonic hooks are generated away from the output surface of the dielectrics by correctly engineering each individual dielectric structure to generate minimum diffraction and maximum scattering along the propagation axis. Different scenarios are studied such as dual-dielectric structures having different lateral dimensions and refractive index as well as cases when both dielectrics have the same lateral dimensions. The results are evaluated both numerically and theoretically demonstrating an excellent agreement between them. These results may open new avenues for optical trapping, focusing and sensing devices via compact and simple dual-dielectric structures.

scholarly journals Optimized anti-reflection core-shell microspheres for enhanced optical trapping by structured light beams

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Vahid Shahabadi ◽  
Ebrahim Madadi ◽  
Daryoush Abdollahpour
Keyword(s):  
Gaussian Beam ◽  
Optical Trapping ◽  
Structured Light ◽  
Core Shell ◽  
Amorphous Titania ◽  
Radially Polarized Beam ◽  
Polarized Beam ◽  
The Common ◽  
Light Beams ◽  
Radially Polarized

AbstractIn this paper, we study the optical trapping of anti-reflection core-shell microspheres by regular Gaussian beam and several structured beams including radially polarized Gaussian, petal, and hard-aperture-truncated circular Airy beams. We show that using an appropriate anti-reflection core-shell microsphere for the optical trapping by several structured light beams can dramatically enhance the strength of the trap compared to the trapping by the common Gaussian beam. The optimal core-shell thickness ratio that minimizes the scattering force is obtained for polystyrene-silica and anatase-amorphous titania microspheres, such that the core-shells act as anti-reflection coated microspheres. We show that the trapping strength of the anti-reflection coated microparticles trapped by the common Gaussian beam is enhanced up to 2-fold compared to that of trapped uncoated microparticles, while the trapping of anti-reflection coated microparticles, by the radially polarized beam, is strengthened up to 4-fold in comparison to that of the trapped uncoated microparticles by the Gaussian beam. Our results indicate that for anatase-amorphous titania microparticles highest trap strength is obtained by radially polarized beam, while for the polystyrene-silica microparticles, the strongest trapping is achieved by the petal beam.

scholarly journals Optimized anti-reflection core-shell microspheres for enhanced optical trapping by structured light beams

2020 ◽  
Author(s):  
Vahid Shahabadi ◽  
Ebrahim Madadi ◽  
Daryoush Abdollahpour
Keyword(s):  
Gaussian Beam ◽  
Optical Trapping ◽  
Structured Light ◽  
Core Shell ◽  
Amorphous Titania ◽  
Radially Polarized Beam ◽  
Polarized Beam ◽  
The Common ◽  
Light Beams ◽  
Radially Polarized

Abstract In this paper, we study the optical trapping of anti-reflection core-shell microspheres by regular Gaussian beam and several structured beams including radially polarized Gaussian, petal, and hard-aperture-truncated circular Airy beams. We show that using an appropriate anti-reflection core-shell microsphere for the optical trapping by several structured light beams can dramatically enhance the strength of the trap compared to the trapping by the common Gaussian beam. The optimal core-shell thickness ratio that minimizes the scattering force is obtained for polystyrene-silica and anatase-amorphous titania microspheres, such that the core-shells act as anti-reflection coated microspheres. We show that the trapping strength of the anti-reflection coated microparticles trapped by the common Gaussian beam is enhanced up to 2-folds compared to that of trapped uncoated microparticles, while the trapping of anti-reflection coated microparticles, by the radially polarized beam, is strengthened up to 4-folds in comparison to that of the trapped uncoated microparticles by the Gaussian beam. Our results indicate that for anatase-amorphous titania microparticles highest trap strength is obtained by radially polarized beam, while for the polystyrene-silica microparticles, the strongest trapping is achieved by the petal beam.

Ultrasensitive surface refractive index imaging in all-dielectric structures

2021 ◽  
Author(s):  
Silvia Romano ◽  
Maria Mangini ◽  
Erika Penzo ◽  
Stefano Cabrini ◽  
Anna Chiara De Luca ◽  
...  
Keyword(s):  
Refractive Index ◽  
Dielectric Structures

scholarly journals Generation and Detection of Structured Light: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Jian Wang ◽  
Yize Liang
Keyword(s):  
Quantum Information Processing ◽  
Structured Light ◽  
Super Resolution ◽  
Research Progress ◽  
Free Space Optical ◽  
The Past ◽  
Integrated Devices ◽  
Different Types ◽  
Resolution Imaging ◽  
Light Beams

Structured light beams have rapidly advanced over the past few years, from specific spatial-transverse/longitudinal structure to tailored spatiotemporal structure. Such beams with diverse spatial structures or spatiotemporal structures have brought various breakthroughs to many fields, including optical communications, optical sensing, micromanipulation, quantum information processing, and super-resolution imaging. Thus, plenty of methods have been proposed, and lots of devices have been manufactured to generate structured light beams by tailoring the structures of beams in the space domain and the space–time domain. In this paper, we firstly give a brief introduction of different types of structured light. Then, we review the recent research progress in the generation and detection of structured light on different platforms, such as free space, optical fiber, and integrated devices. Finally, challenges and perspectives are also discussed.

Optical Trapping of Low Refractive Index Particles by Dual Vortex Beams

2021 ◽  
Author(s):  
Sho Nakaya ◽  
Yuichi Kozawa ◽  
Yuuki Uesugi ◽  
Shunichi Sato
Keyword(s):  
Refractive Index ◽  
Optical Trapping ◽  
Vortex Beams ◽  
Low Refractive Index

scholarly journals Structured light beams constituted of incoming and outgoing waves

2019 ◽  
Vol 100 (5) ◽  
Author(s):  
Job Mendoza-Hernández ◽  
Maximino Luis Arroyo-Carrasco ◽  
Marcelo David Iturbe-Castillo ◽  
Sabino Chávez-Cerda
Keyword(s):  
Structured Light ◽  
Light Beams

scholarly journals Coated High-Refractive-Index Barium Titanate Glass Microspheres for Optically Trapped Microsphere Super-Resolution Microscopy: A Simulation Study

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 84
Author(s):  
Xi Liu ◽  
Song Hu ◽  
Yan Tang
Keyword(s):  
Refractive Index ◽  
Barium Titanate ◽  
Optical Trapping ◽  
Super Resolution ◽  
High Refractive Index ◽  
Trapping Efficiency ◽  
Single Beam ◽  
Imaging Performance ◽  
Super Resolution Microscopy ◽  
Optically Trapped

As water is normally used as the immersion medium in optically trapped microsphere microscopy, the high-refractive-index barium titanate glass (BTG) microsphere shows a better imaging performance than the low-index polystyrene (PS) or melamine formaldehyde (MF) microsphere, but it is difficult to be trapped by single-beam optical trapping due to its overly high refractive index. In this study, coated BTG microspheres with a PS coating have been computationally explored for the combination of optical trapping with microsphere-assisted microscopy. The PS coating thickness affects both the optical trapping efficiency and photonic nanojet (PNJ) property of the coated BTG sphere. Compared to the uncoated BTG sphere, the coated BTG sphere with a proper PS coating thickness has a highly improved trapping efficiency which enables single-beam optical trapping, and a better PNJ with a higher optical intensity Imax and a narrower full width at half maximum (FWHM) corresponding to better imaging performance. These coated BTG spheres also have an advantage in trapping efficiency and imaging performance over conventional PS and MF spheres. The coated BTG microsphere is highly desirable for optically trapped microsphere super-resolution microscopy and potentially beneficial to other research areas, such as nanoparticle detection.

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