scholarly journals Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 903 ◽  
Author(s):  
Haoyang Yu ◽  
Qian Zhou ◽  
Xinghui Li ◽  
Xiaohao Wang ◽  
Xilin Wang ◽  
...  
Keyword(s):  
Spectral Range ◽  
High Performance ◽  
Near Infrared ◽  
Frequency Control ◽  
High Sensitivity ◽  
Cost Effective ◽  
Correction Method ◽  
Gas Detection ◽  
Mode Suppression ◽  
Spectroscopic Tool

Dual-comb spectroscopy has been an infusive spectroscopic tool for gas detection due to its high resolution, high sensitivity, and fast acquisition speed over a broad spectral range without any mechanical scanning components. However, the complexity and cost of high-performance dual-comb spectroscopy are still high for field-deployed applications. To solve this problem, we propose a simple frequency domain post-processing method by extracting the accurate position of a specific absorption line frame by frame. After aligning real-time spectra and averaging for one second, the absorbance spectrum of H13C14N gas in the near-infrared is obtained over 1.1 THz spectral range. By using this method, the standard deviation of residual error is only ~0.002, showing great agreement with the conventional correction method. In addition, the spectral resolution is improved from 13.4 GHz to 4.3 GHz compared to direct spectrum averaging. Our method does not require a specially designed common-mode suppression comb, rigorous frequency control system, or complicated computational algorithm, providing a cost-effective scheme for field-deployed Doppler-limited spectroscopy applications.

scholarly journals Mode Sensitivity Exploration of Silica–Titania Waveguide for Refractive Index Sensing Applications

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7452
Author(s):  
Muhammad A. Butt ◽  
Andrzej Kaźmierczak ◽  
Cuma Tyszkiewicz ◽  
Paweł Karasiński ◽  
Ryszard Piramidowicz
Keyword(s):  
Refractive Index ◽  
High Performance ◽  
Near Infrared ◽  
Sol Gel ◽  
Cost Effective ◽  
Dip Coating ◽  
Infrared Wavelength ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Coating Method

In this paper, a novel and cost-effective photonic platform based on silica–titania material is discussed. The silica–titania thin films were grown utilizing the sol–gel dip-coating method and characterized with the help of the prism-insertion technique. Afterwards, the mode sensitivity analysis of the silica–titania ridge waveguide is investigated via the finite element method. Silica–titania waveguide systems are highly attractive due to their ease of development, low fabrication cost, low propagation losses and operation in both visible and near-infrared wavelength ranges. Finally, a ring resonator (RR) sensor device was modelled for refractive index sensing applications, offering a sensitivity of 230 nm/RIU, a figure of merit (FOM) of 418.2 RIU−1, and Q-factor of 2247.5 at the improved geometric parameters. We believe that the abovementioned integrated photonics platform is highly suitable for high-performance and economically reasonable optical sensing devices.

scholarly journals Flexible Ecoflex®/Graphene Nanoplatelet Foams for Highly Sensitive Low-Pressure Sensors

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4406
Author(s):  
Marco Fortunato ◽  
Irene Bellagamba ◽  
Alessio Tamburrano ◽  
Maria Sabrina Sarto
Keyword(s):  
High Performance ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Cost Effective ◽  
Low Pressure ◽  
Human Motion ◽  
Compression Tests ◽  
Piezoresistive Sensors ◽  
Human Motion Detection ◽  
Pressure Regime

The high demand for multifunctional devices for smart clothing applications, human motion detection, soft robotics, and artificial electronic skins has encouraged researchers to develop new high-performance flexible sensors. In this work, we fabricated and tested new 3D squeezable Ecoflex® open cell foams loaded with different concentrations of graphene nanoplatelets (GNPs) in order to obtain lightweight, soft, and cost-effective piezoresistive sensors with high sensitivity in a low-pressure regime. We analyzed the morphology of the produced materials and characterized both the mechanical and piezoresistive response of samples through quasi-static cyclic compression tests. Results indicated that sensors infiltrated with 1 mg of ethanol/GNP solution with a GNP concentration of 3 mg/mL were more sensitive and stable compared to those infiltrated with the same amount of ethanol/GNP solution but with a lower GNP concentration. The electromechanical response of the sensors showed a negative piezoresistive behavior up to ~10 kPa and an opposite trend for the 10–40 kPa range. The sensors were particularly sensitive at very low deformations, thus obtaining a maximum sensitivity of 0.28 kPa−1 for pressures lower than 10 kPa.

scholarly journals Josephson junction infrared single-photon detector

Science ◽  
2021 ◽  
Vol 372 (6540) ◽  
pp. 409-412
Author(s):  
Evan D. Walsh ◽  
Woochan Jung ◽  
Gil-Ho Lee ◽  
Dmitri K. Efetov ◽  
Bae-Ian Wu ◽  
...  
Keyword(s):  
Josephson Junction ◽  
High Speed ◽  
High Performance ◽  
Near Infrared ◽  
Single Photon ◽  
Critical Role ◽  
Superconducting Devices ◽  
High Sensitivity ◽  
Single Photon Detector ◽  
Detection Mechanism

Josephson junctions are superconducting devices used as high-sensitivity magnetometers and voltage amplifiers as well as the basis of high-performance cryogenic computers and superconducting quantum computers. Although device performance can be degraded by the generation of quasiparticles formed from broken Cooper pairs, this phenomenon also opens opportunities to sensitively detect electromagnetic radiation. We demonstrate single near-infrared photon detection by coupling photons to the localized surface plasmons of a graphene-based Josephson junction. Using the photon-induced switching statistics of the current-biased device, we reveal the critical role of quasiparticles generated by the absorbed photon in the detection mechanism. The photon sensitivity will enable a high-speed, low-power optical interconnect for future superconducting computing architectures.

scholarly journals Metal Oxide Nanoparticle-Decorated Few Layer Graphene Nanoflake Chemoresistors for the Detection of Aromatic Volatile Organic Compounds

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3413 ◽  
Author(s):  
Syrine Behi ◽  
Nadra Bohli ◽  
Juan Casanova-Cháfer ◽  
Eduard Llobet ◽  
Adnane Abdelghani
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Environmental Scanning Electron Microscopy ◽  
High Sensitivity ◽  
Cost Effective ◽  
Morphological Characterization ◽  
Environmental Scanning ◽  
Metal Oxide Nanoparticle ◽  
Benzene Toluene ◽  
Living Organisms

Benzene, toluene, and xylene, commonly known as BTX, are hazardous aromatic organic vapors with high toxicity towards living organisms. Many techniques are being developed to provide the community with portable, cost effective, and high performance BTX sensing devices in order to effectively monitor the quality of air. In this paper, we study the effect of decorating graphene with tin oxide (SnO2) or tungsten oxide (WO3) nanoparticles on its performance as a chemoresistive material for detecting BTX vapors. Transmission electron microscopy and environmental scanning electron microscopy are used as morphological characterization techniques. SnO2-decorated graphene displayed high sensitivity towards benzene, toluene, and xylene with the lowest tested concentrations of 2 ppm, 1.5 ppm, and 0.2 ppm, respectively. In addition, we found that, by employing these nanomaterials, the observed response could provide a unique double signal confirmation to identify the presence of benzene vapors for monitoring occupational exposure in the textiles, painting, and adhesives industries or in fuel stations.

High-performance near-infrared (NIR) polymer light-emitting diodes (PLEDs) based on bipolar Ir(iii)-complex-grafted polymers

2021 ◽  
Vol 9 (1) ◽  
pp. 173-180
Author(s):  
Wentao Li ◽  
Baowen Wang ◽  
Tiezheng Miao ◽  
Jiaxiang Liu ◽  
Guorui Fu ◽  
...  
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Cost Effective ◽  
Device Performance ◽  
Grafted Polymers ◽  
Large Area ◽  
Light Emitting ◽  
Doped Polymers ◽  
Polymer Light Emitting Diodes ◽  
The Cost

Despite the cost-effective and large-area scalable advantages of NIR-PLEDs based on iridium(iii)-complex-doped polymers, the intrinsic phase-separation issue leading to inferior device performance is difficult to address.

Synthesis of bismuth sulfide nanobelts for high performance broadband photodetectors

2020 ◽  
Vol 8 (6) ◽  
pp. 2102-2108 ◽  
Author(s):  
Jinzhuo Xu ◽  
Henan Li ◽  
Shaofan Fang ◽  
Ke Jiang ◽  
Huizhen Yao ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Performance ◽  
Near Infrared ◽  
High Sensitivity ◽  
Infrared Light ◽  
Bismuth Sulfide ◽  
Near Infrared Light

We fabricated a superior broadband photodetector based on single crystal Bi2S3 nanobelts with a high sensitivity to UV-near infrared light.

scholarly journals Enabling materials for subwavelength-size low-loss surface modes in the Terahertz spectral range

2019 ◽  
Author(s):  
Mathieu Poulin ◽  
Steven Giannacopoulos ◽  
Maksim Skorobogatiy
Keyword(s):  
Surface Waves ◽  
Spectral Range ◽  
Near Infrared ◽  
Super Resolution ◽  
High Sensitivity ◽  
Low Loss ◽  
Material Interfaces ◽  
Practical Applications ◽  
Terahertz Frequencies ◽  
Non Destructive

Terahertz spectral range (frequencies of 0.1-1 THz) has recently emerged as the next frontier for non-destructive imaging, industrial sensing and ultra-fast wireless communications. Here, we review several classes of materials such as simple metals, semiconductors, high-k dielectrics, polar materials, zero gap materials, as well as structured materials that can support strongly localized electromagnetic modes at material interfaces in the Terahertz spectral range. We present the basic theory of surface waves, detail the requirement of strong modal confinement and low loss for the surface waves propagating at material interfaces and discuss challenges for excitation of such modes at Terahertz frequencies. A large number of examples related to naturally occurring and artificial materials is then presented. A variety of practical applications is envisioned for surface waves at Terahertz frequencies including non-destructive super-resolution imaging and quality control, high sensitivity sensors capable of operation with small volumes of analytes that are opaque in the visible and near-infrared, as well as design of compact optical circuit for the upcoming ultra-high bitrate THz communication devices.

Developing High Sensitivity Biomass Sensor Using Lamé Mode Square Resonator

2011 ◽  
Vol 254 ◽  
pp. 46-49 ◽  
Author(s):  
Amir Heidari ◽  
Yong Jin Yoon ◽  
Woo Tae Park ◽  
Ming Lin Julius Tsai
Keyword(s):  
Quality Factor ◽  
Atmospheric Pressure ◽  
Output Signal ◽  
High Performance ◽  
High Sensitivity ◽  
Cost Effective ◽  
Resonant Mode ◽  
Biological Agents ◽  
High Quality ◽  
Mass Sensitivity

In this paper, a new cost-effective and reliable high performance biomass sensor is presented. Compared to previous biomass sensors, the developed sensor shows a potential to detect smaller biological agents by producing a high quality output signal at atmospheric pressure. The biomass sensor is a micro machined silicon squared plate that is excited in the Lamé bulk acoustic resonant mode at a frequency of 37.8 MHz, with quality factor of 10,000 and the mass sensitivity of -400 Hz/pg.

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