scholarly journals Faraday Rotation of Dy2O3, CeF3 and Y3Fe5O12 at the Mid-Infrared Wavelengths

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5324
Author(s):  
David Vojna ◽  
Ondřej Slezák ◽  
Ryo Yasuhara ◽  
Hiroaki Furuse ◽  
Antonio Lucianetti ◽  
...  
Keyword(s):  
Optical Properties ◽  
Faraday Rotation ◽  
Wavelength Dependence ◽  
Comprehensive Investigation ◽  
Active Materials ◽  
Mid Infrared ◽  
Broadband Radiation ◽  
Rough Approximation ◽  
Depth Analysis ◽  
Infrared Wavelengths

The relatively narrow choice of magneto-active materials that could be used to construct Faraday devices (such as rotators or isolators) for the mid-infrared wavelengths arguably represents a pressing issue that is currently limiting the development of the mid-infrared lasers. Furthermore, the knowledge of the magneto-optical properties of the yet-reported mid-infrared magneto-active materials is usually restricted to a single wavelength only. To address this issue, we have dedicated this work to a comprehensive investigation of the magneto-optical properties of both the emerging (Dy2O3 ceramics and CeF3 crystal) and established (Y3Fe5O12 crystal) mid-infrared magneto-active materials. A broadband radiation source was used in a combination with an advanced polarization-stepping method, enabling an in-depth analysis of the wavelength dependence of the investigated materials’ Faraday rotation. We were able to derive approximate models for the examined dependence, which, as we believe, may be conveniently used for designing the needed mid-infrared Faraday devices for lasers with the emission wavelengths in the 2-μm spectral region. In the case of Y3Fe5O12 crystal, the derived model may be used as a rough approximation of the material’s saturated Faraday rotation even beyond the 2-μm wavelengths.

scholarly journals Thickness-dependent optical properties of aluminum nitride films for mid-infrared wavelengths

2021 ◽  
Vol 39 (4) ◽  
pp. 043408
Author(s):  
Leonid Yu. Beliaev ◽  
Evgeniy Shkondin ◽  
Andrei V. Lavrinenko ◽  
Osamu Takayama
Keyword(s):  
Optical Properties ◽  
Aluminum Nitride ◽  
Mid Infrared ◽  
Infrared Wavelengths

scholarly journals Polymorphic gallium for active resonance tuning in photonic nanostructures: from bulk gallium to two-dimensional (2D) gallenene

Nanophotonics ◽  
2020 ◽  
Vol 9 (14) ◽  
pp. 4233-4252
Author(s):  
Yael Gutiérrez ◽  
Pablo García-Fernández ◽  
Javier Junquera ◽  
April S. Brown ◽  
Fernando Moreno ◽  
...  
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Phase Change Materials ◽  
Two Dimensional ◽  
Active Materials ◽  
Promising Candidate ◽  
Plasmonic Structures ◽  
Resonance Tuning ◽  
The Many ◽  
Optical Behavior

AbstractReconfigurable plasmonics is driving an extensive quest for active materials that can support a controllable modulation of their optical properties for dynamically tunable plasmonic structures. Here, polymorphic gallium (Ga) is demonstrated to be a very promising candidate for adaptive plasmonics and reconfigurable photonics applications. The Ga sp-metal is widely known as a liquid metal at room temperature. In addition to the many other compelling attributes of nanostructured Ga, including minimal oxidation and biocompatibility, its six phases have varying degrees of metallic character, providing a wide gamut of electrical conductivity and optical behavior tunability. Here, the dielectric function of the several Ga phases is introduced and correlated with their respective electronic structures. The key conditions for optimal optical modulation and switching for each Ga phase are evaluated. Additionally, we provide a comparison of Ga with other more common phase-change materials, showing better performance of Ga at optical frequencies. Furthermore, we first report, to the best of our knowledge, the optical properties of liquid Ga in the terahertz (THz) range showing its broad plasmonic tunability from ultraviolet to visible-infrared and down to the THz regime. Finally, we provide both computational and experimental evidence of extension of Ga polymorphism to bidimensional two-dimensional (2D) gallenene, paving the way to new bidimensional reconfigurable plasmonic platforms.

Assessment of the accuracy of scaling methods for radiance simulations at far and mid infrared wavelengths

2021 ◽  
pp. 107739
Author(s):  
Michele Martinazzo ◽  
Davide Magurno ◽  
William Cossich ◽  
Carmine Serio ◽  
Guido Masiello ◽  
...  
Keyword(s):  
Mid Infrared ◽  
Scaling Methods ◽  
Infrared Wavelengths

Electrical modulation of the optical properties of mid-infrared metamaterials

2012 ◽  
Vol 101 (25) ◽  
pp. 251109 ◽  
Author(s):  
K. Larsen ◽  
D. Austin ◽  
I. C. Sandall ◽  
D. G. Davies ◽  
D. G. Revin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Mid Infrared ◽  
Electrical Modulation

scholarly journals Airborne pollen observations using a multi-wavelength Raman polarization lidar in Finland: characterization of pure pollen types

2020 ◽  
Author(s):  
Xiaoxia Shang ◽  
Elina Giannakaki ◽  
Stephanie Bohlmann ◽  
Maria Filioglou ◽  
Annika Saarto ◽  
...  
Keyword(s):  
Optical Properties ◽  
Airborne Pollen ◽  
Pollen Grains ◽  
Wavelength Dependence ◽  
Depolarization Ratio ◽  
Mean Values ◽  
Pollen Types ◽  
Pine Pollen ◽  
Significant Wavelength ◽  
532 Nm

Abstract. We present a novel algorithm for characterizing the optical properties of pure pollen particles, based on the depolarization values obtained in lidar measurements. The algorithm was first tested and validated through a simulator, and then applied to the lidar observations during a four-month pollen campaign from May to August 2016 at the European Aerosol Research Lidar Network (EARLINET) station in Kuopio (62°44′ N, 27°33′ E), in Eastern Finland. Twenty types of pollen were observed and identified from concurrent measurements with Burkard sampler; Birch (Betula), pine (Pinus), spruce (Picea) and nettle (Urtica) pollen were most abundant, contributing more than 90 % of total pollen load, regarding number concentrations. Mean values of lidar-derived optical properties in the pollen layer were retrieved for four intense pollination periods (IPPs). Lidar ratios at both 355 and 532 nm ranged from 55 to 70 sr for all pollen types, without significant wavelength-dependence. Enhanced depolarization ratio was found when there were pollen grains in the atmosphere, and even higher depolarization ratio (with mean values of 25 % or 14 %) was observed with presence of the more non-spherical spruce or pine pollen. The depolarization ratio at 532 nm of pure pollen particles was assessed, resulting to 24 ± 3 % and 36 ± 5 % for birch and pine pollen, respectively. Pollen optical properties at 1064 nm and 355 nm were also estimated. The backscatter-related Ångström exponent between 532 and 1064 nm was assessed as ~ 0.8 (~ 0.5) for pure birch (pine) pollen, thus the longer wavelength would be better choice to trace pollen in the air. The pollen depolarization ratio at 355 nm of 17 % and 30 % were found for birch and pine pollen, respectively. The depolarization values show a wavelength dependence for pollen. This can be the key parameter for pollen detection and characterization.

scholarly journals Wavelength Dependence of Poly(p-hydroxystyrene) Ablation by Mid-Infrared Free-Electron Laser

2019 ◽  
Vol 32 (2) ◽  
pp. 189-193
Author(s):  
Minoru Toriumi ◽  
Takayasu Kawasaki ◽  
Mitsunori Araki ◽  
Takayuki Imai ◽  
Koichi Tsukiyama
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Wavelength Dependence ◽  
Mid Infrared

Optical properties of laser sintered polyamide 12

2015 ◽  
Vol 21 (4) ◽  
pp. 443-448 ◽  
Author(s):  
Mengqi Yuan ◽  
David L. Bourell
Keyword(s):  
Optical Properties ◽  
Plate Thickness ◽  
Monochromatic Light ◽  
Green Light ◽  
Wavelength Dependence ◽  
Light Transmittance ◽  
Content Type ◽  
Light Emitting ◽  
Polyamide 12 ◽  
Lighting Conditions

Purpose – The purpose of this paper is to report selected optical properties of laser sintered polyamide 12 blank plates under different monochromatic and white light conditions and to apply these properties in production of laser sintered lithophanes. Design/methodology/approach – A UNICO 1201E spectrophotometer was used to measure the transmittance of laser sintered polyamide 12 plates as a function of plate thickness. Monochromatic light-emitting diodes were used to assess the wavelength dependence on the transmission and contrast as captured by a SONY DSC-W55 camera. Findings – The transmittance decreased with increasing plate thickness which varied significantly depending on the monochromatic wavelength. Highest transmission was observed using green light (525 nm) and poorest transmission was measured for yellow light (589 nm). Research limitations/implications – There is a limit to the amount of contrast obtained in polyamide lithophanes because the thickness of the plates is limited to less than about 5 mm. Greater thickness results in discernible topology on the lithophane which impairs the quality of the image. Originality/value – Light transmittance of polyamide 12 plates under different lighting conditions is reported and applied to optically defined laser sintered lithophanes.

Kerr nonlinearity and multi-photon absorption in germanium at mid-infrared wavelengths

2017 ◽  
Vol 111 (9) ◽  
pp. 091902 ◽  
Author(s):  
B.-U. Sohn ◽  
C. Monmeyran ◽  
L. C. Kimerling ◽  
A. M. Agarwal ◽  
D. T. H. Tan
Keyword(s):  
Kerr Nonlinearity ◽  
Photon Absorption ◽  
Mid Infrared ◽  
Infrared Wavelengths
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