Euclid warm testing of the near-infrared optical assembly using a unique combination of CGH interferometry and tactile precision measurements

2019 ◽  
Author(s):  
Frank U. Grupp ◽  
Jennifer Kaminski ◽  
Christof T. Bodendorf ◽  
Norbert Geis ◽  
Daniela Penka ◽  
...  
Keyword(s):  
Near Infrared ◽  
Precision Measurements ◽  
Unique Combination

scholarly journals Synthesis of High-Purity Solid SiO2 Nanodumbbells via Induced Aggregation

2020 ◽  
Author(s):  
Yu-Hao Deng
Keyword(s):  
Tensile Strength ◽  
High Purity ◽  
Near Infrared ◽  
Precision Measurements ◽  
Infrared Light ◽  
Macroscopic Quantum ◽  
High Uniformity ◽  
Quantum Sensing ◽  
New Material ◽  
Induced Aggregation

<p>Optically levitated nanodumbbells in vacuum are excellent candidates for thermodynamics, macroscopic quantum mechanics, precision measurements, and quantum sensing. Silica (SiO<sub>2</sub>) material, with extremely low absorption of near-infrared light and rubust mechanical strength, has been the most potential material for this system. Here we synthesized high-purity solid SiO<sub>2</sub> nanodumbbells by introducing acetone for the induced aggregation of SiO<sub>2 </sub>nanospheres. The nanodumbbells show high uniformity and the sizes are tunable. Previous experimental results demonstrated that the synthetic nanodumbbells can be applied in GHz nanomechanical rotors and can withstand the tensile strength of over 13 GPa. This work engineers a new material platform to advance levitated optomechanics.</p>

scholarly journals Synthesis of High-Purity Solid SiO2 Nanodumbbells via Induced Aggregation

2021 ◽  
Author(s):  
Yu-Hao Deng
Keyword(s):  
High Purity ◽  
Near Infrared ◽  
Precision Measurements ◽  
Infrared Light ◽  
High Yield ◽  
Stöber Method ◽  
High Uniformity ◽  
New Material ◽  
Induced Aggregation ◽  
Work Supports

<p></p><p>Optically levitated nanodumbbells in vacuum are excellent candidates for thermodynamics, macroscopic quantum mechanics, precision measurements and quantum sensing. Silica (SiO<sub>2</sub>) material, with extremely low absorption of near-infrared light and super mechanical strength, has been the most potential material for optically levitated systems. Here we synthesize high-purity solid SiO<sub>2</sub> nanodumbbells via Stöber method by introducing acetone for the induced aggregation of SiO<sub>2 </sub>nanospheres. The nanodumbbells show high uniformity and their sizes are tunable. Previous experimental results demonstrated that the synthetic nanodumbbells can be applied in GHz nanomechanical rotors and can withstand the tensile strength of over 13 GPa. This work supports batch production and high yield of SiO<sub>2</sub> nanodumbbells, which engineers a new material platform to advance levitated optomechanics.</p><p></p>

scholarly journals A High-Performance 2.5 μm Charge Domain Global Shutter Pixel and Near Infrared Enhancement with Light Pipe Technology

Sensors ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 307 ◽  
Author(s):  
Ikuo Mizuno ◽  
Masafumi Tsutsui ◽  
Toshifumi Yokoyama ◽  
Tatsuya Hirata ◽  
Yoshiaki Nishi ◽  
...  
Keyword(s):  
Mobile Applications ◽  
High Performance ◽  
Near Infrared ◽  
Form Factors ◽  
Light Sensitivity ◽  
Unique Combination ◽  
Modulation Transfer ◽  
Light Pipe ◽  
Industrial Cameras ◽  
Better Than

We developed a new 2.5 μm global shutter (GS) pixel using a 65 nm process with an advanced light pipe (LP) structure. This is the world’s smallest charge domain GS pixel reported so far. This new developed pixel platform is a key enabler for ultra-high resolution sensors, industrial cameras with wide aperture lenses, and low form factors optical modules for mobile applications. The 2.5 μm GS pixel showed excellent optical performances: 68% quantum efficiency (QE) at 530 nm, ±12.5 degrees angular response (AR), and quite low parasitic light sensitivity (PLS)—10,400 1/PLS with the F#2.8 lens. In addition, we achieved an extremely low memory node (MN) dark current 13 e−/s at 60 °C by fully pinned MN. Furthermore, we studied how the LP technology contributes to the improvement of the modulation transfer function (MTF) in near infrared (NIR) enhanced GS pixel. The 2.8 μm GS pixel using a p-substrate showed 109 lp/mm MTF@50% at 940 nm, which is 1.6 times better than that without an LP. The MTF can be more enhanced by the combination of the LP and the deep photodiode (PD) electrically isolated from the substrate. We demonstrated the advantage of using LP technology and our advanced stacked deep photodiode (SDP) technology together. This unique combination showed an improvement of more than 100% in NIR QE while maintaining an MTF that is close to the theoretical Nyquist limit (MTF @50% = 156 lp/mm).

scholarly journals Synthesis of High-Purity Solid SiO2 Nanodumbbells via Induced Aggregation

2020 ◽  
Author(s):  
Yu-Hao Deng
Keyword(s):  
Tensile Strength ◽  
High Purity ◽  
Near Infrared ◽  
Precision Measurements ◽  
Infrared Light ◽  
Macroscopic Quantum ◽  
High Uniformity ◽  
Quantum Sensing ◽  
New Material ◽  
Induced Aggregation

<p>Optically levitated nanodumbbells in vacuum are excellent candidates for thermodynamics, macroscopic quantum mechanics, precision measurements, and quantum sensing. Silica (SiO<sub>2</sub>) material, with extremely low absorption of near-infrared light and rubust mechanical strength, has been the most potential material for this system. Here we synthesized high-purity solid SiO<sub>2</sub> nanodumbbells by introducing acetone for the induced aggregation of SiO<sub>2 </sub>nanospheres. The nanodumbbells show high uniformity and the sizes are tunable. Previous experimental results demonstrated that the synthetic nanodumbbells can be applied in GHz nanomechanical rotors and can withstand the tensile strength of over 13 GPa. This work engineers a new material platform to advance levitated optomechanics.</p>

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

Construction of a near-infrared responsive upconversion nanoplatform against hypoxic tumors via NO-enhanced photodynamic therapy

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7875-7887 ◽  
Author(s):  
Ying Lan ◽  
Xiaohui Zhu ◽  
Ming Tang ◽  
Yihan Wu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Near Infrared ◽  
Upconversion Nanoparticles

A near-infrared (NIR) activated theranostic nanoplatform based on upconversion nanoparticles (UCNPs) is developed in order to overcome the hypoxia-associated resistance in photodynamic therapy by photo-release of NO upon NIR illumination.

A nitroreductase-activatable near-infrared theranostic photosensitizer for photodynamic therapy under mild hypoxia

2020 ◽  
Vol 56 (43) ◽  
pp. 5819-5822
Author(s):  
Jing Zheng ◽  
Yongzhuo Liu ◽  
Fengling Song ◽  
Long Jiao ◽  
Yingnan Wu ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Triplet State ◽  
Near Infrared ◽  
Mild Hypoxia

In this study, a near-infrared (NIR) theranostic photosensitizer was developed based on a heptamethine aminocyanine dye with a long-lived triplet state.

Fluorescent proteins for in vivo imaging, where's the biliverdin?

2020 ◽  
Vol 48 (6) ◽  
pp. 2657-2667
Author(s):  
Felipe Montecinos-Franjola ◽  
John Y. Lin ◽  
Erik A. Rodriguez
Keyword(s):  
Hydrogen Peroxide ◽  
In Vivo Imaging ◽  
Near Infrared ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Fluorescent Imaging ◽  
Infrared Light ◽  
Red Fluorescent Protein ◽  
Color Palette

Noninvasive fluorescent imaging requires far-red and near-infrared fluorescent proteins for deeper imaging. Near-infrared light penetrates biological tissue with blood vessels due to low absorbance, scattering, and reflection of light and has a greater signal-to-noise due to less autofluorescence. Far-red and near-infrared fluorescent proteins absorb light &gt;600 nm to expand the color palette for imaging multiple biosensors and noninvasive in vivo imaging. The ideal fluorescent proteins are bright, photobleach minimally, express well in the desired cells, do not oligomerize, and generate or incorporate exogenous fluorophores efficiently. Coral-derived red fluorescent proteins require oxygen for fluorophore formation and release two hydrogen peroxide molecules. New fluorescent proteins based on phytochrome and phycobiliproteins use biliverdin IXα as fluorophores, do not require oxygen for maturation to image anaerobic organisms and tumor core, and do not generate hydrogen peroxide. The small Ultra-Red Fluorescent Protein (smURFP) was evolved from a cyanobacterial phycobiliprotein to covalently attach biliverdin as an exogenous fluorophore. The small Ultra-Red Fluorescent Protein is biophysically as bright as the enhanced green fluorescent protein, is exceptionally photostable, used for biosensor development, and visible in living mice. Novel applications of smURFP include in vitro protein diagnostics with attomolar (10−18 M) sensitivity, encapsulation in viral particles, and fluorescent protein nanoparticles. However, the availability of biliverdin limits the fluorescence of biliverdin-attaching fluorescent proteins; hence, extra biliverdin is needed to enhance brightness. New methods for improved biliverdin bioavailability are necessary to develop improved bright far-red and near-infrared fluorescent proteins for noninvasive imaging in vivo.

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