Topic
Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
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31 May 2021
TL;DR: In this paper, the propagation and interaction of Bessel beams in a photorefractive (PR) nonlinear medium were numerically investigated and it was shown that complex multi-channel structures can be photoinduced by single or two counter-propagating (CP) Bessel beam.
Abstract: We numerically investigate the propagation and interaction of Bessel beams in a photorefractive (PR) nonlinear medium. By varying Bessel beam parameters and the PR nonlinearity, complex multi-channel structures can be photoinduced by single or two counter-propagating (CP) Bessel beams. These results pave the way towards all-optical interconnects.
01 Oct 2020
Dissertation•
01 Jan 2017
TL;DR: In this article, integrated optical phased arrays are proposed and demonstrated for the first time as a method for generating quasi-Bessel beams in a fully-integrated, compactform-factor system.
Abstract: Optical trapping and tweezing the manipulation of particles using optical forces enables direct interaction with biological samples and non-invasive monitoring of their properties. As such, optical trapping has become a common tool in biology with applications ranging from better understanding of DNA mechanics to non-invasive manipulation of red blood cells in vivo. While optical trapping using bulk optics is a well established technique, recent work has turned towards chip-based optical trapping using integrated devices. However, many of these integrated systems are fundamentally limited to passive demonstrations within microns of the chip surface. Integrated optical phased arrays, which manipulate and dynamically steer light, provide one possible approach to scaling and arbitrary tweezing of optical traps. However, current on-chip optical phased array demonstrations have focused on systems which form and steer beams or project arbitrary radiation patterns in the far field. In this thesis, Fresnel-lens-inspired focusing integrated optical phased arrays are demonstrated for the first time and proposed as a method for chip-based optical trapping. These systems focus radiated light to tightly-confined spots in the near field above the chip to enable applications in wide-angle trapping at millimeter scales. Furthermore, integrated optical phased arrays are proposed and demonstrated for the first time as a method for generating quasi-Bessel beams in a fully-integrated, compactform-factor system. Through generation of quasi-Bessel beams with elongated properties, these devices have potential for applications in multi-particle, multi-plane optical trapping. To enable these phased array systems, a suite of integrated nanophotonic architectures and devices for waveguiding, coupling, routing, phase control, and radiation are developed, simulated, fabricated, and tested and a CMOS-compatible foundry platform is leveraged for natural scaling to active demonstrations. Thesis Supervisor: Michael R. Watts Title: Associate Professor of Electrical Engineering
Patent•
18 Feb 2021
TL;DR: In this article, a method of forming a bond between substrates and manipulating the bond comprises: emitting a first laser energy onto a strip of an absorption material disposed between a substrate and a second substrate until the strip diffuses into the first substrate and the second substrate resulting in workpiece with a bond, the series of fault lines forming a contour.
Abstract: A method of forming a bond between substrates and manipulating the bond comprises: emitting a first laser energy onto a strip of an absorption material disposed between a first substrate and a second substrate until the strip diffuses into the first substrate and the second substrate resulting in workpiece with a bond between the first substrate and the second substrate; emitting a second laser energy through the workpiece at the bond to create a fault line through the bond, the first substrate, and the second substrate, the second laser energy provided by an approximated Bessel beam, the approximated Bessel beam incident upon the bond having a diameter that is greater than a width of the bond; and repeating emitting the second laser energy step along a length of the bond to create a series of fault lines through the bond, the series of fault lines forming a contour.
04 Dec 2007
TL;DR: In this paper, a zeroth-order Bessel beam was used to illuminate the Kretschmann configuration to increase the measurement speed of the localized surface plasmon microscope.
Abstract: We report a method to increase the measurement speed of the localized surface plasmon microscope. In our method, a zeroth-order Bessel beam is used to illuminate the Kretschmann configuration. The coupling efficiency of the illumination light is measured to find the refractive index on the metal.