Optical tuning of a tellurium cavity: optical modulation and bistability in the infrared region at room temperature

1982 ◽  
Vol 14 (2) ◽  
pp. 157-167 ◽  
Author(s):  
Gisbert Staupendahl ◽  
Klaus Schindler
Keyword(s):  
Room Temperature ◽  
Infrared Region ◽  
Optical Modulation

Orthogonal electronic coupling in multicentre arylamine mixed-valence compounds based on a dibenzofulvene–thiophene conjugated bridge

2017 ◽  
Vol 53 (64) ◽  
pp. 8960-8963 ◽  
Author(s):  
A. Beneduci ◽  
G. A. Corrente ◽  
E. Fabiano ◽  
V. Maltese ◽  
S. Cospito ◽  
...  
Keyword(s):  
Near Infrared ◽  
Mixed Valence ◽  
Infrared Region ◽  
Optical Modulation ◽  
Electronic Coupling ◽  
Voltage Dependent ◽  
Near Infrared Region ◽  
Mixed Valence Compounds

Novel H-shaped tetrarylamine mixed valence compounds showing orthogonal electronic coupling generate voltage-dependent electro-optical modulation in the near infrared region.

scholarly journals The Effect Of Thickness on The Optical Properties Of ZnS

2007 ◽  
Vol 4 (4) ◽  
pp. 647-652
Author(s):  
Baghdad Science Journal
Keyword(s):  
Band Gap ◽  
Room Temperature ◽  
Near Infrared ◽  
High Vacuum ◽  
Ultra Violet ◽  
Infrared Region ◽  
Complex Dielectric Constant ◽  
Film Properties ◽  
Corning Glass ◽  
Different Thickness

Zinc sulfide(ZnS) thin films of different thickness were deposited on corning glass with the substrate kept at room temperature and high vacuum using thermal evaporation technique.the film properties investigated include their absorbance/transmittance/reflectance spectra,band gap,refractive index,extinction coefficient,complex dielectric constant and thickness.The films were found to exhibt high transmittance(59-98%) ,low absorbance and low reflectance in the visible/near infrared region up to 900 nm..However, the absorbance of the films were found to be high in the ultra violet region with peak around 360 nm.The thickness(using optical interference fringes method) of various films thichness(100,200,300,and 400) nm.The band gap measured was found to be in the range (3.52 -3.78 )eV.

Graphene-Ta2O5 Heterostructure Enabled High Performance, Deep-Ultraviolet to Mid-Infrared Photodetection

Nanoscale ◽  
2021 ◽  
Author(s):  
Vinh Ho ◽  
Yifei Wang ◽  
Michael Cooney ◽  
Nguyen Q Vinh
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Low Cost ◽  
Infrared Region ◽  
Temperature Sensitive ◽  
Mid Infrared ◽  
Significant Challenge ◽  
Deep Ultraviolet ◽  
Infrared Photodetection

Ultrafast, high sensitive, low cost photodetectors operating at room temperature sensitive from the deep-ultraviolet to mid-infrared region remain a significant challenge in optoelectronics. Achievements in traditional semiconductors using cryogenic operation...

Collision-induced microwave absorption in gaseous mixtures of various rare gases at 2.3 cm−1

1980 ◽  
Vol 58 (5) ◽  
pp. 633-641 ◽  
Author(s):  
I. R. Dagg ◽  
W. D. Leckie ◽  
L. A. A. Read
Keyword(s):  
Microwave Absorption ◽  
Room Temperature ◽  
Infrared Region ◽  
Exponential Model ◽  
Rare Gas ◽  
Rare Gases ◽  
Gaseous Mixtures ◽  
Induced Dipole ◽  
Upper Limits ◽  
Density Ratios

Collision-induced microwave absorption has been observed at 2.3 cm−1 for the rare gas mixtures Ne–Kr, Ar–Kr, Ar–Xe, and Kr–Xe. The absorption coefficient has been measured at room temperature for density products up to 8000 amagat2 and for various density ratios. These results have been used in conjunction with those of the infrared region to determine more accurately the zeroth moment for each of the spectra and hence have allowed improved values for the induced dipole moment parameters for the exponential model. Upper limits to the absorption in He–Xe and He–Ar mixtures in the microwave region have also been established.

Determining of Infrared Transition of InN Film Grown on C-Plane Sapphire by Photoreflectance

2011 ◽  
Vol 110-116 ◽  
pp. 985-990
Author(s):  
Dong Po Wang ◽  
Li Wei Tu
Keyword(s):  
Binding Energy ◽  
Molecular Beam Epitaxy ◽  
Room Temperature ◽  
Molecular Beam ◽  
Infrared Region ◽  
Excitonic Transitions ◽  
Best Fit

An InN film was grown on sapphire (c-plane) by plasma-assisted molecular beam epitaxy, and its photoluminescence at 10 K and photoreflectance (PR) spectra from 10 K to 110 K were measured. Some prominent features in the PR spectra were observed in the infrared region below 120 K. The signals become too weak to observable for temperature above 110K. Furthermore, the binding energy of InN exciton was estimated to be 9.43 meV, which is equal to kBT at 109K. Therefore, the features in the PR spectra were assigned to the A, B, and C excitonic transitions associated with the direct gap of wurtzite InN. The thus obtained energies of the A, B, and C excitonic transitions versus temperature were fitted well by Varshini’s equation. The energies of the A, B, and C excitonic transitions at room temperature obtained by the best fit of Varshni’s equation are 0.738, 0.746, and 0.764 eV, respectively.

scholarly journals Diphylleia grayi-Inspired Stretchable Hydrochromics with Large Optical Modulation in the Visible–Near-Infrared Region

2018 ◽  
Vol 10 (43) ◽  
pp. 37685-37693 ◽  
Author(s):  
Guofa Cai ◽  
Jiangxin Wang ◽  
Alice Lee-Sie Eh ◽  
Jingwei Chen ◽  
Kai Qian ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Region ◽  
Optical Modulation ◽  
Near Infrared Region

scholarly journals Broadband photoluminescence in a ceramic (Mg2SnO4–SnO2):Cr3+ system

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
N. D. C. Santana ◽  
A. López ◽  
L. P. Sosman ◽  
S. S. Pedro
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Electronic Configuration ◽  
Infrared Region ◽  
Spectroscopic Studies ◽  
Crystal Field Theory ◽  
X Ray ◽  
Broadband Light Source ◽  
Near Infrared Region ◽  
Intense Emission

AbstractThis study reports the synthesis and photoluminescence spectroscopic studies of Cr3+-doped Mg2SnO4–SnO2 ceramics. The crystal structure was analyzed by X-ray powder diffraction, and photoluminescence was investigated at room temperature. The diffractogram confirmed the presence of Mg2SnO4 and SnO2 phases. Photoluminescence spectroscopy identified broad and intense emission bands assigned to the Cr3+ cation occupation in octahedral Mg2SnO4 sites and an orange band assigned to SnO2 emission. All spectra were analyzed and interpreted according to crystal field theory and Tanabe–Sugano theory for the d3 electronic configuration. The broad and intense emission band covering the visible/near-infrared region suggests that this system may be a promising material for use as an active medium in a broadband light source at room temperature.

scholarly journals Cryogenic electro-optic interconnect for superconducting devices

2020 ◽  
Author(s):  
Tobias Kippenberg ◽  
Amir Youssefi ◽  
Itay Shomroni ◽  
Yash Joshi ◽  
Nathan Bernier ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Room Temperature ◽  
Noise Figure ◽  
Superconducting Devices ◽  
Telecommunication Networks ◽  
Optical Modulation ◽  
High Electron ◽  
Optical Modulators ◽  
Optomechanical System ◽  
Electro Optic

Abstract Encoding information onto optical fields using electro-optical modulation is the backbone of modern telecommunication networks, offering vast bandwidth and low-loss transport via optical fibers. For these reasons, optical fibers are also replacing electrical cables for short range communications within data centers. Compared to electrical coaxial cables, optical fibers also introduce two orders of magnitude smaller heat load from room to milli-Kelvin temperatures, making optical interconnects based on electro-optical modulation an attractive candidate for interfacing superconducting quantum circuits and hybrid superconducting devices. Yet, little is known about optical modulation at cryogenic temperatures. Here we demonstrate a proof-of-principle cryogenic electro-optical interconnect, showing that currently employed Ti-doped lithium niobate phase modulators are compatible with operation down to 800mK ---below the typical operation temperature of conventional microwave amplifiers based on high electron mobility transistors (HEMTs)---and maintain their room temperature Pockels coefficient. We utilize cryogenic electro-optical modulation to perform spectroscopy of a superconducting circuit optomechanical system, measuring optomechanically induced transparency (OMIT). In addition, we encode thermomechanical sidebands from the microwave domain onto an optical signal processed at room temperature. Although the currently achieved noise figure is significantly higher than that of a typical HEMT, substantial noise reduction should be attainable by harnessing recent advances in integrated modulators, by increasing the modulator length, or by using materials with a higher electro-optic coefficient, leading to noise levels on par with HEMTs. Our work highlights the potential of electro-optical modulators for massively parallel readout for emerging quantum computing or cryogenic classical computing platforms.

scholarly journals Ultrasmall PEI-Decorated Bi2Se3 Nanodots as a Multifunctional Theranostic Nanoplatform for in vivo CT Imaging-Guided Cancer Photothermal Therapy

2021 ◽  
Vol 12 ◽  
Author(s):  
Peng Zhang ◽  
Lei Wang ◽  
Xiuying Chen ◽  
Xiang Li ◽  
Qinghai Yuan
Keyword(s):  
Photothermal Therapy ◽  
Room Temperature ◽  
Near Infrared ◽  
Infrared Region ◽  
Ct Imaging ◽  
Broad Absorption ◽  
Good Biocompatibility ◽  
Imaging Performance

Bi-based nanomaterials, such as Bi2Se3, play an important part in biomedicine, such as photothermal therapy (PTT) and computed tomography (CT) imaging. Polyethylenimine (PEI)-modified ultrasmall Bi2Se3 nanodots were prepared using an ultrafast synthetic method at room temperature (25°C). Bi2Se3 nanodots exhibited superior CT imaging performance, and could be used as effective photothermal reagents owing to their broad absorption in the ultraviolet–visible–near infrared region. Under irradiation at 808 nm, PEI-Bi2Se3 nanodots exhibited excellent photothermal-conversion efficiency of up to 41.3%. Good biocompatibility and significant tumor-ablation capabilities were demonstrated in vitro and in vivo. These results revealed that PEI-Bi2Se3 nanodots are safe and a good nanotheranostic platform for CT imaging-guided PTT of cancer.

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