Near Infrared Absorbing Dyes for Electro-Optical Applications

NIR news ◽  
1994 ◽  
Vol 5 (5) ◽  
pp. 10-13
Author(s):  
Nobuhiro Kuramoto
Keyword(s):  
Near Infrared ◽  
Optical Applications

Black Silicon Germanium (SiGe) for Extended Wavelength Near Infrared Electro-optical Applications

2010 ◽  
Author(s):  
Fred Semendy ◽  
Patrick Taylor ◽  
Gregory Meissner ◽  
Priyalal Wijewarnasuriya
Keyword(s):  
Silicon Germanium ◽  
Near Infrared ◽  
Black Silicon ◽  
Optical Applications

scholarly journals Nano-Crystallization of Ln-Fluoride Crystals in Glass-Ceramics via Inducing of Yb3+ for Efficient Near-Infrared Upconversion Luminescence of Tm3+

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1033
Author(s):  
Jianfeng Li ◽  
Yi Long ◽  
Qichao Zhao ◽  
Shupei Zheng ◽  
Zaijin Fang ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Glass Ceramics ◽  
Upconversion Emission ◽  
Ceramic Composites ◽  
Wide Range ◽  
Transmission Window ◽  
Optical Applications ◽  
Upconversion Emissions

Transparent glass-ceramic composites embedded with Ln-fluoride nanocrystals are prepared in this work to enhance the upconversion luminescence of Tm3+. The crystalline phases, microstructures, and photoluminescence properties of samples are carefully investigated. KYb3F10 nanocrystals are proved to controllably precipitate in the glass-ceramics via the inducing of Yb3+ when the doping concentration varies from 0.5 to 1.5 mol%. Pure near-infrared upconversion emissions are observed and the emission intensities are enhanced in the glass-ceramics as compared to in the precursor glass due to the incorporation of Tm3+ into the KYb3F10 crystal structures via substitutions for Yb3+. Furthermore, KYb2F7 crystals are also nano-crystallized in the glass-ceramics when the Yb3+ concentration exceeds 2.0 mol%. The upconversion emission intensity of Tm3+ is further enhanced by seven times as Tm3+ enters the lattice sites of pure KYb2F7 nanocrystals. The designed glass ceramics provide efficient gain materials for optical applications in the biological transmission window. Moreover, the controllable nano-crystallization strategy induced by Yb3+ opens a new way for engineering a wide range of functional nanomaterials with effective incorporation of Ln3+ ions into fluoride crystal structures.

Development of a New Glass for both Visible and Near-Infrared Optical Applications

2018 ◽  
Vol 786 ◽  
pp. 224-235
Author(s):  
Hytham Abdelghany El-Ghany
Keyword(s):  
Optical Materials ◽  
Nonlinear Optical ◽  
Near Infrared ◽  
Nonlinear Optical Materials ◽  
Melt Quenching ◽  
Nd:Yag Lasers ◽  
Near Ir ◽  
Prepared Glass ◽  
Optical Applications ◽  
Electric Susceptibility

A glass system of composition 40P2O5-40ZnO-(20-x)Na2O-xCdO (where, x = 1, 2, 3, 4, 5 and 6 mol%) was prepared using the conventional melt quenching technique. The glass formability of the prepared samples was inspected using XRD technique. Archimedes’ method was used to determine the density of the prepared glass samples then the molar volume was calculated. The optical spectroscopic investigations of the prepared glass samples were carried out over the spectral range (190-2500 nm). The proposed glass showed a successive transparency in both visible and near-IR ranges of spectrum till 2500 nm with considerably high transmission of about 78%. The refractive index of the glass samples with some other useful parameters such as dielectric constant, electric susceptibility and electronic polarizability of the prepared glass were evaluated. The results suggest the practicality of utilizing such new glass in the fabrication of optical supplies such as lenses and optical windows used for Nd:YAG lasers. The metallization criteria data of the prepared glass propose a good basis for predicting new nonlinear optical materials.

Highly Fluorescent, Near-Infrared-Emitting Cd2+-Tuned HgS Nanocrystals with Optical Applications

Langmuir ◽  
2015 ◽  
Vol 31 (11) ◽  
pp. 3500-3509 ◽  
Author(s):  
Jing Yang ◽  
Yaoping Hu ◽  
Jun Luo ◽  
Yu-Hua Zhu ◽  
Jun-Sheng Yu
Keyword(s):  
Near Infrared ◽  
Optical Applications

Potential of Nano-Sized Rare Earth Fluorides in Optical Applications

2005 ◽  
Vol 106 ◽  
pp. 93-102 ◽  
Author(s):  
Ulrich H. Kynast ◽  
Marina M. Lezhnina ◽  
H. Kätker
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Vacuum Ultraviolet ◽  
Wide Band ◽  
Rare Earth Ions ◽  
Wide Band Gap ◽  
Coordination Numbers ◽  
Porous Matrices ◽  
Optical Applications ◽  
Rare Earth Fluorides

Rare earth fluorides are a class of materials with a high potential for optical applications. Fluoride lattices allow high coordination numbers for the hosted rare earth ions, but the high ionicity of the rare earth to fluorine bond leads to a wide band gap and very low vibrational energies. These two essential factors, in particular, contribute to their practicality for use in optical applications based on vacuum ultraviolet (VUV) and near infrared (NIR) excitation. The preparation and optical characteristics of rare earth fluoride nanoparticles and their embedding in polymeric, glassy or porous matrices are very promising for the eventual manufacture of transparent hybrid materials. Recent attempts to control the size of these particles down to the nano-scale and, at the same time, maintaining the performance of their macroscopic counterparts, indicate accessibility of hitherto unrealized optical properties and applications.

Disordered Photonic Crystal Slabs for Thin-Film Photovoltaics

2018 ◽  
Author(s):  
Chelsea Carlson
Keyword(s):  
Thin Film ◽  
Photonic Crystal ◽  
Near Infrared ◽  
Crystalline Silicon ◽  
Solar Spectrum ◽  
Silicon Layer ◽  
Physical Parameters ◽  
Photonic Crystal Slabs ◽  
Optical Applications ◽  
Conversion Efficiencies

Photonic crystal nanostructures are the foundation for many optical applications such as nanochip waveguides, optical fibres, and high-Q nanocavities. Recently, researchers have begun to explore the use of photonic crystal slabs to increase the overall absorption of sunlight in thin-film solar photovoltaic (PV) cells. Currently, amorphous silicon (a-Si:H) thin-film technologies can only achieve efficiencies of up to 16% in laboratories and less than 10% in manufactured commercial products. The difficulty in improving these efficiencies arises from the inherent band gap properties of the crystalline silicon layer: the natural photonic bandgap in the near infrared (IR) region of light prohibits almost a third of the entire available solar spectrum from being absorbed. Some of this loss can be salvaged by increasing the thickness of the silicon layer, but this drives the price of the cell up and has very limited potential. However, using photonic crystal nanostructures in the active layer of the cell can decrease the reflection of light at the surface and increase the photon path within the film, enhancing the collection and conversion efficiencies over a broad spectrum. The absorption can be further increased by introducing pseudo-disorder within the structures. The purpose of this study was to explore the physical parameters of this disorder and quantitatively optimize absorption.

scholarly journals Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2698
Author(s):  
Nurperi Yavuz ◽  
Mustafa Mert Bayer ◽  
Hüseyin Ozan Ҫirkinoğlu ◽  
Ali Serpengüzel ◽  
Thien Le Phu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Polarized Light ◽  
Tunable Laser ◽  
Infrared Region ◽  
Nitrogen Vacancy ◽  
Quality Factors ◽  
High Quality ◽  
Near Surface ◽  
Optical Applications ◽  
Bulk Diamond

An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

scholarly journals Broadband Absorption Tailoring of SiO2/Cu/ITO Arrays Based on Hybrid Coupled Resonance Mode

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 852 ◽  
Author(s):  
Jiqing Lian ◽  
Dawei Zhang ◽  
Ruijin Hong ◽  
Tingzhen Yan ◽  
Taiguo Lv ◽  
...  
Keyword(s):  
Near Infrared ◽  
Broad Band ◽  
Fdtd Method ◽  
Local Surface Plasmon Resonance ◽  
Cross Sectional ◽  
Broadband Absorption ◽  
Gap Resonance ◽  
Optical Applications ◽  
Difference Time ◽  
Sub Wavelength

Sub-wavelength artificial photonic structures can be introduced to tailor and modulate the spectrum of materials, thus expanding the optical applications of these materials. On the basis of SiO2/Cu/ITO arrays, a hybrid coupled resonance (HCR) mechanism, including the epsilon-near-zero (ENZ) mode of ITO, local surface plasmon resonance (LSPR) mode and the microstructural gap resonance (GR) mode, was proposed and researched by systematically regulating the array period and layer thickness. The optical absorptions of the arrays were simulated under different conditions by the finite-difference time-domain (FDTD) method. ITO films were prepared and characterized to verify the existence of ENZ mode and Mie theory was used to describe the LSPR mode. The cross-sectional electric field distribution was analyzed while SiO2/Cu/ITO multilayers were also fabricated, of which absorption was measured and calculated by Macleod simulation to prove the existence of GR and LSPR mode. Finally, the broad-band tailoring of optical absorption peaks from 673 nm to 1873 nm with the intensities from 1.8 to 0.41 was realized, which expands the applications of ITO-based plasmonic metamaterials in the near infrared (NIR) region.

scholarly journals Tuning the Surface Plasmon Resonance of Lanthanum Hexaboride to Absorb Solar Heat: A Review

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2473 ◽  
Author(s):  
Tracy Mattox ◽  
Jeffrey Urban
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Near Infrared ◽  
Lanthanum Hexaboride ◽  
Solar Heat ◽  
Atomic Vibrations ◽  
Optical Applications ◽  
Made In ◽  
Absorbance Band

While traditional noble metal (Ag, Au, and Cu) nanoparticles are well known for their plasmonic properties, they typically only absorb in the ultraviolet and visible regions. The study of metal hexaborides, lanthanum hexaboride (LaB6) in particular, expands the available absorbance range of these metals well into the near-infrared. As a result, LaB6 has become a material of interest for its energy and heat absorption properties, most notably to those trying to absorb solar heat. Given the growing popularity of LaB6, this review focuses on the advances made in the past decade with respect to controlling the plasmonic properties of LaB6 nanoparticles. This review discusses the fundamental structure of LaB6 and explains how decreasing the nanoparticle size changes the atomic vibrations on the surface and thus the plasmonic absorbance band. We explain how doping LaB6 nanoparticles with lanthanide metals (Y, Sm, and Eu) red-shifts the absorbance band and describe research focusing on the correlation between size dependent and morphological effects on the surface plasmon resonance. This work also describes successes that have been made in dispersing LaB6 nanoparticles for various optical applications, highlighting the most difficult challenges encountered in this field of study.

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