scholarly journals Sub-diffractional cavity modes of terahertz hyperbolic phonon polaritons in tin oxide

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Flávio H. Feres ◽  
Rafael A. Mayer ◽  
Lukas Wehmeier ◽  
Francisco C. B. Maia ◽  
E. R. Viana ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Direct Detection ◽  
Far Infrared ◽  
Infrared Range ◽  
Hyper Spectral ◽  
Cavity Modes ◽  
Hyper Spectral Imaging ◽  
Infrared Frequency Range ◽  
Phonon Polaritons ◽  
Experimental Findings

AbstractHyperbolic phonon polaritons have recently attracted considerable attention in nanophotonics mostly due to their intrinsic strong electromagnetic field confinement, ultraslow polariton group velocities, and long lifetimes. Here we introduce tin oxide (SnO2) nanobelts as a photonic platform for the transport of surface and volume phonon polaritons in the mid- to far-infrared frequency range. This report brings a comprehensive description of the polaritonic properties of SnO2 as a nanometer-sized dielectric and also as an engineered material in the form of a waveguide. By combining accelerator-based IR-THz sources (synchrotron and free-electron laser) with s-SNOM, we employed nanoscale far-infrared hyper-spectral-imaging to uncover a Fabry–Perot cavity mechanism in SnO2 nanobelts via direct detection of phonon-polariton standing waves. Our experimental findings are accurately supported by notable convergence between theory and numerical simulations. Thus, the SnO2 is confirmed as a natural hyperbolic material with unique photonic properties essential for future applications involving subdiffractional light traffic and detection in the far-infrared range.

scholarly journals Hyper-spectral imaging system with harmonic diffraction element in medium and far infrared

2010 ◽  
Vol 59 (10) ◽  
pp. 6980
Author(s):  
Liu Ying ◽  
Sun Qiang ◽  
Lu Zhen-Wu ◽  
Qu Feng ◽  
Wu Hong-Sheng ◽  
...  
Keyword(s):  
Imaging System ◽  
Spectral Imaging ◽  
Far Infrared ◽  
Hyper Spectral ◽  
Hyper Spectral Imaging

scholarly journals Detection of Waxed Chestnuts using Visible and Near-Infrared Hyper-spectral Imaging

2016 ◽  
Vol 22 (2) ◽  
pp. 267-277
Author(s):  
Baicheng Li ◽  
Baolu Hou ◽  
Yao Zhou ◽  
Mantong Zhao ◽  
Dawei Zhang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Spectral Imaging ◽  
Hyper Spectral ◽  
Hyper Spectral Imaging

Analysis of background irradiation in thermal IR hyper-spectral imaging systems

2010 ◽  
Author(s):  
Weiming Xu ◽  
Liyin Yuan ◽  
Ying Lin ◽  
Zhiping He ◽  
Rong Shu ◽  
...  
Keyword(s):  
Spectral Imaging ◽  
Imaging Systems ◽  
Hyper Spectral ◽  
Hyper Spectral Imaging

Polarization-Sensitive Fourier-Transform Spectroscopy of HgTe/CdHgTe Quantum Wells in the Far Infrared Range in a Magnetic Field

JETP Letters ◽  
2018 ◽  
Vol 108 (5) ◽  
pp. 329-334 ◽  
Author(s):  
L. S. Bovkun ◽  
A. V. Ikonnikov ◽  
V. Ya. Aleshkin ◽  
S. S. Krishtopenko ◽  
N. N. Mikhailov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fourier Transform ◽  
Quantum Wells ◽  
Far Infrared ◽  
Fourier Transform Spectroscopy ◽  
Infrared Range

scholarly journals Orbital and atmospheric characterization of the planet within the gap of the PDS 70 transition disk

2018 ◽  
Vol 617 ◽  
pp. L2 ◽  
Author(s):  
A. Müller ◽  
M. Keppler ◽  
Th. Henning ◽  
M. Samland ◽  
G. Chauvin ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Direct Detection ◽  
Spectral Energy Distribution ◽  
Spectral Energy ◽  
Infrared Range ◽  
Data Set ◽  
Cloud Properties ◽  
Spectrophotometric Data ◽  
First Time

Context. The observation of planets in their formation stage is a crucial but very challenging step in understanding when, how, and where planets form. PDS 70 is a young pre-main sequence star surrounded by a transition disk, in the gap of which a planetary-mass companion has recently been discovered. This discovery represents the first robust direct detection of such a young planet, possibly still at the stage of formation. Aims. We aim to characterize the orbital and atmospheric properties of PDS 70 b, which was first identified on May 2015 in the course of the SHINE survey with SPHERE, the extreme adaptive-optics instrument at the VLT. Methods. We obtained new deep SPHERE/IRDIS imaging and SPHERE/IFS spectroscopic observations of PDS 70 b. The astrometric baseline now covers 6 yr, which allowed us to perform an orbital analysis. For the first time, we present spectrophotometry of the young planet which covers almost the entire near-infrared range (0.96–3.8 μm). We use different atmospheric models covering a large parameter space in temperature, log g, chemical composition, and cloud properties to characterize the properties of the atmosphere of PDS 70 b. Results. PDS 70 b is most likely orbiting the star on a circular and disk coplanar orbit at ~22 au inside the gap of the disk. We find a range of models that can describe the spectrophotometric data reasonably well in the temperature range 1000–1600 K and log g no larger than 3.5 dex. The planet radius covers a relatively large range between 1.4 and 3.7 RJ with the larger radii being higher than expected from planet evolution models for the age of the planet of 5.4 Myr. Conclusions. This study provides a comprehensive data set on the orbital motion of PDS 70 b, indicating a circular orbit and a motion coplanar with the disk. The first detailed spectral energy distribution of PDS 70 b indicates a temperature typical of young giant planets. The detailed atmospheric analysis indicates that a circumplanetary disk may contribute to the total planetflux.

scholarly journals A test of the ability of current bulk optical models to represent the radiative properties of cirrus cloud across the mid-and far-infrared

2020 ◽  
Author(s):  
Richard J. Bantges ◽  
Helen E. Brindley ◽  
Jonathan E. Murray ◽  
Alan E. Last ◽  
Cathryn Fox ◽  
...  
Keyword(s):  
Compensation Effect ◽  
Far Infrared ◽  
Single Scattering ◽  
Radiative Properties ◽  
Cirrus Cloud ◽  
Atmospheric Measurements ◽  
Infrared Observations ◽  
Ice Cloud ◽  
Infrared Frequency Range ◽  
The Uk

Abstract. Measurements of mid- to far-infrared nadir radiances obtained from the UK Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 aircraft during the Cirrus Coupled Cloud-Radiation Experiment (CIRCCREX) are used to assess the performance of various ice cloud bulk optical (single-scattering) property models. Through use of a minimisation approach, we find that the simulations can reproduce the observed spectra in the mid-infrared to within measurement uncertainty but are unable to simultaneously match the observations over the far-infrared frequency range. When both mid and far-infrared observations are used to minimise residuals, first order estimates of the flux differences between the best performing simulations and observations indicate a strong compensation effect between the mid and far infrared such that the absolute broadband difference is

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