scholarly journals Nanostructured silica spin–orbit optics for modal vortex beam shaping

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Delphine Coursault ◽  
Etienne Brasselet
Keyword(s):  
Degrees Of Freedom ◽  
Incident Light ◽  
Spatial Light Modulators ◽  
Spin Orbit ◽  
Optical Elements ◽  
Light Modulators ◽  
Dynamic Phase ◽  
Optical Modes ◽  
Nanostructured Silica ◽  
Theoretical Proposal

Abstract Modality is a generic concept of wave-optics at the basis of optical information and communications. One of the challenges of photonics technologies based on optical orbital angular momentum consists in the production of a modal content for both the azimuthal and radial degrees of freedom. This basically requires shaping the complex amplitude of an incident light beam, which is usually made up from adaptive spatial light modulators or bespoke devices. Here, we report on the experimental attempt of a recent theoretical proposal [Opt. Lett. 42, 1966 (2017)] toward the production of various optical vortex modes of the Laguerre–Gaussian type relying on the spin–orbit interaction of light. This is done in the visible domain from optical elements made out of silica glass. The idea consists in exploiting the combined effects of azimuthally-varying geometric phase with that of radially-varying propagation features. The proposed approach can be readily extended to any wavelength as well as to other families of optical modes, although some dynamic phase problems remain to be solved to make it a turnkey technology.

scholarly journals Modern Types of Axicons: New Functions and Applications

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6690
Author(s):  
Svetlana N. Khonina ◽  
Nikolay L. Kazanskiy ◽  
Pavel A. Khorin ◽  
Muhammad A. Butt
Keyword(s):  
Intensity Distribution ◽  
Integrated Circuit ◽  
Bessel Beam ◽  
Optical Element ◽  
Spatial Light Modulators ◽  
Optical Antennas ◽  
Optical Elements ◽  
Photonic Integrated Circuit ◽  
Light Modulators

Axicon is a versatile optical element for forming a zero-order Bessel beam, including high-power laser radiation schemes. Nevertheless, it has drawbacks such as the produced beam’s parameters being dependent on a particular element, the output beam’s intensity distribution being dependent on the quality of element manufacturing, and uneven axial intensity distribution. To address these issues, extensive research has been undertaken to develop nondiffracting beams using a variety of advanced techniques. We looked at four different and special approaches for creating nondiffracting beams in this article. Diffractive axicons, meta-axicons-flat optics, spatial light modulators, and photonic integrated circuit-based axicons are among these approaches. Lately, there has been noteworthy curiosity in reducing the thickness and weight of axicons by exploiting diffraction. Meta-axicons, which are ultrathin flat optical elements made up of metasurfaces built up of arrays of subwavelength optical antennas, are one way to address such needs. In addition, when compared to their traditional refractive and diffractive equivalents, meta-axicons have a number of distinguishing advantages, including aberration correction, active tunability, and semi-transparency. This paper is not intended to be a critique of any method. We have outlined the most recent advancements in this field and let readers determine which approach best meets their needs based on the ease of fabrication and utilization. Moreover, one section is devoted to applications of axicons utilized as sensors of optical properties of devices and elements as well as singular beams states and wavefront features.

Optical Studies of The Uniformity of Thermally Induced In-Plane Strain in Thin Gallium Arsenide Films

1994 ◽  
Vol 340 ◽  
Author(s):  
M. Taysing-Lara ◽  
H. Shen ◽  
M. Wraback ◽  
J. Pamulapati ◽  
M. Dutta
Keyword(s):  
Plane Strain ◽  
Interband Transition ◽  
Incident Light ◽  
Polarization Vector ◽  
Spot Size ◽  
Spatial Light Modulators ◽  
Thermally Induced ◽  
Light Modulators ◽  
Key Issues ◽  
Lift Off

ABSTRACTIn-plane anisotropic strain can be employed in the design of a new class of optoelectronic devices, such as high contrast, polarization sensitive spatial light modulators. One of the key issues involved in realizing these devices is obtaining a controllable and uniform in-plane strain. We have studied the uniformity of thermally induced in-plane strain in MOCVD grown GaAs lift-off thin films mounted on LiTaO3 or CaCO3 substrates. The experiment exploits the straininduced splitting of the excitonic interband transition at low temperature through absorption measurements using a Ti-Sapphire laser focused to a spot size less than 100 μm. The polarization vector of the incident light was oriented along an axis which enhances both features. From the energy positions of these transitions, the magnitude as well as the type of the in-plane strain was determined. Topographic scans performed over a 1.4mm X 1.4mm area for the sample bonded to CaCO3, and along a 2 mm line for that bonded to LiTaO3 revealed variations in strain of less than 5%.

Liquid crystal Bragg gratings: dynamic optical elements for spatial light modulators

2007 ◽  
Author(s):  
R. L. Sutherland ◽  
V. P. Tondiglia ◽  
L. V. Natarajan ◽  
J. M. Wofford ◽  
S. A. Siwecki ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Bragg Gratings ◽  
Spatial Light Modulators ◽  
Optical Elements ◽  
Light Modulators

scholarly journals Plasmonic metasurfaces manipulating the two spin components from spin–orbit interactions of light with lattice field generations

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ruirui Zhang ◽  
Manna Gu ◽  
Rui Sun ◽  
Xiangyu Zeng ◽  
Yuqin Zhang ◽  
...  
Keyword(s):  
Berry Phase ◽  
Incident Light ◽  
Polarized Light ◽  
Polarization Degree ◽  
Spin Orbit ◽  
Optical Fields ◽  
Circularly Polarized Light ◽  
Dynamic Phase ◽  
Spin Orbit Interactions ◽  
Opposite Helicity

Abstract Artificial nanostructures in metasurfaces induce strong spin–orbit interactions (SOIs), by which incident circularly polarized light can be transformed into two opposite spin components. The component with an opposite helicity to the incident light acquires a geometric phase and is used to realize the versatile functions of the metasurfaces; however, the other component, with an identical helicity, is often neglected as a diffused background. Here, by simultaneously manipulating the two spin components originating from the SOI in plasmonic metasurfaces, independent wavefields in the primary and converted spin channels are achieved; the wavefield in the primary channel is controlled by tailoring the dynamic phase, and that in the converted channel is regulated by designing the Pancharatnam–Berry phase in concurrence with the dynamic phase. The scheme is realized by generating optical lattice fields with different topologies in two spin channels, with the metasurfaces composed of metal nanoslits within six round-apertures mimicking the multi-beam interference. This study demonstrates independent optical fields in a dual-spin channel based on the SOI effect in the metasurface, which provides a higher polarization degree of freedom to modify optical properties at the subwavelength scale.

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