scholarly journals Perforated hollow-core optical waveguides for on-chip atomic spectroscopy and gas sensing

2016 ◽  
Vol 108 (13) ◽  
pp. 131105 ◽  
Author(s):  
M. Giraud-Carrier ◽  
C. Hill ◽  
T. Decker ◽  
J. A. Black ◽  
H. Schmidt ◽  
...  
Keyword(s):  
Optical Waveguides ◽  
Gas Sensing ◽  
Atomic Spectroscopy ◽  
Hollow Core ◽  
On Chip

All-nanoparticle layer-by-layer coatings for Mid-IR on-chip gas sensing

2020 ◽  
Vol 56 (91) ◽  
pp. 14283-14286
Author(s):  
Diana Al Husseini ◽  
Junchao Zhou ◽  
Daniel Willhelm ◽  
Trevor Hastings ◽  
Gregory S. Day ◽  
...  
Keyword(s):  
Optical Waveguides ◽  
Gas Sensing ◽  
Layer By Layer ◽  
Precise Control ◽  
Nanoparticle Layer ◽  
Withdrawal Speed ◽  
Layer Deposition ◽  
Nanoparticle Coatings ◽  
On Chip

Functionalization of optical waveguides with submicron all-nanoparticle coatings significantly enhanced the detection of acetone. Such coatings were enabled via precise control of the substrate withdrawal speed using the layer-by-layer deposition.

On-Chip Micro–Electro–Mechanical System Fourier Transform Infrared (MEMS FT-IR) Spectrometer-Based Gas Sensing

2016 ◽  
Vol 70 (5) ◽  
pp. 897-904 ◽  
Author(s):  
Mazen Erfan ◽  
Yasser M Sabry ◽  
Mohammad Sakr ◽  
Bassem Mortada ◽  
Mostafa Medhat ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Mechanical System ◽  
Gas Sensing ◽  
Fourier Transform Infrared ◽  
Micro Electro Mechanical System ◽  
Ft Ir ◽  
On Chip

scholarly journals On-Chip Narrowband Thermal Emitter for Mid-IR Optical Gas Sensing

ACS Photonics ◽  
2017 ◽  
Vol 4 (6) ◽  
pp. 1371-1380 ◽  
Author(s):  
Alexander Lochbaum ◽  
Yuriy Fedoryshyn ◽  
Alexander Dorodnyy ◽  
Ueli Koch ◽  
Christian Hafner ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Thermal Emitter ◽  
Optical Gas Sensing ◽  
On Chip

Planar Hollow-Core Waveguide Technology for Atomic Spectroscopy and Quantum Interference in Alkali Vapors

2008 ◽  
Vol 26 (23) ◽  
pp. 3727-3733 ◽  
Author(s):  
Bin Wu ◽  
John F. Hulbert ◽  
Aaron R. Hawkins ◽  
Holger Schmidt
Keyword(s):  
Quantum Interference ◽  
Atomic Spectroscopy ◽  
Hollow Core ◽  
Alkali Vapors

Microfluidic Gas Sensing with Living Microbial Cells Confined in a Microaquarium

2013 ◽  
Vol 543 ◽  
pp. 431-434 ◽  
Author(s):  
Kazunari Ozasa ◽  
Jee Soo Lee ◽  
Simon Song ◽  
Masahiko Hara ◽  
Mizuo Maeda
Keyword(s):  
Real Time ◽  
Concentration Gradient ◽  
Gas Sensing ◽  
Bacterial Chemotaxis ◽  
Optical Microscope ◽  
Sensor Chip ◽  
Microfluidic Channels ◽  
Microbial Cells ◽  
Gas Molecules ◽  
On Chip

We investigated on-chip cytotoxicity gas sensing using the bacterial chemotaxis of Euglena confined in a microaquarium. The sensor chip made from PDMS had one microaquarium and two microfluidic channels passing aside of the microaquarium. The chemotactic microbial cells were confined in the microaquarium, whereas two gases (one sample and one reference) flowed in the two isolated microchannels. Gas molecules move from the microchannels into the microaquarium by permeation through porous PDMS wall, and dissolve into the water in the microaquarium, where Euglena cells are swimming. The chemotactic movements of Euglena were observed with an optical microscope and measured as traces in real time. By injecting CO2 and air into each microchannel separately, the Euglena cells in the microaquarium moved to air side, escaping from CO2. This observation showed that the concentration gradient of CO2 was produced in the water in the microaquarium. The CO2-avoiding movement of Euglena was increased largely at a CO2 concentration of 40%, and then moderately increased above 60%. Some Euglena cells stopped swimming at the air side of the microaquarium and remained there even after CO2 has been removed, which can be used as the indicator of CO2 history.

Gas-sensing performance of In2O3@MoO3 hollow core-shell nanospheres prepared by a two-step hydrothermal method

2021 ◽  
pp. 131007
Author(s):  
Haitao Fu ◽  
Xiaohong Yang ◽  
Zhenxiang Wu ◽  
Peng He ◽  
Shixian Xiong ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Gas Sensing ◽  
Core Shell ◽  
Hollow Core ◽  
Sensing Performance

scholarly journals Volatile Gas Sensing through Terahertz Pipe Waveguide

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6268
Author(s):  
Ja-Yu Lu ◽  
Borwen You ◽  
Jiun-You Wang ◽  
Sheng-Syong Jhuo ◽  
Tun-Yao Hung ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Strong Interaction ◽  
Reflectance Spectrum ◽  
Gas Sensing ◽  
Thz Radiation ◽  
Hollow Core ◽  
Label Free ◽  
Vapor Absorption ◽  
Gas Molecule ◽  
Volatile Liquids

Gas sensing to recognize volatile liquids is successfully conducted through pipe-guided terahertz (THz) radiation in a reflective and label-free manner. The hollow core of a pipe waveguide can efficiently deliver the sensing probe of the THz confined waveguide fields to any place where dangerous vapors exist. Target vapors that naturally diffuse from a sample site into the pipe core can be detected based on strong interaction between the probe and analyte. The power variation of the THz reflectance spectrum in response to various types and densities of vapors are characterized experimentally using a glass pipe. The most sensitive THz frequency of the pipe waveguide can recognize vapors with a resolution at a low part-per-million level. The investigation found that the sensitivity of the pipe-waveguide sensing scheme is dependent on the vapor absorption strength, which is strongly related to the molecular amount and properties including the dipole moment and mass of a gas molecule.

scholarly journals Antiresonant Hollow-Core Fiber-Based Dual Gas Sensor for Detection of Methane and Carbon Dioxide in the Near- and Mid-Infrared Regions

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3813 ◽  
Author(s):  
Piotr Jaworski ◽  
Paweł Kozioł ◽  
Karol Krzempek ◽  
Dakun Wu ◽  
Fei Yu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Simultaneous Detection ◽  
Hollow Core ◽  
Mid Infrared ◽  
Sensing Applications ◽  
Core Fiber ◽  
Sensor Configuration ◽  
Carbon Dioxide Co2

In this work, we present for the first time a laser-based dual gas sensor utilizing a silica-based Antiresonant Hollow-Core Fiber (ARHCF) operating in the Near- and Mid-Infrared spectral region. A 1-m-long fiber with an 84-µm diameter air-core was implemented as a low-volume absorption cell in a sensor configuration utilizing the simple and well-known Wavelength Modulation Spectroscopy (WMS) method. The fiber was filled with a mixture of methane (CH4) and carbon dioxide (CO2), and a simultaneous detection of both gases was demonstrated targeting their transitions at 3.334 µm and 1.574 µm, respectively. Due to excellent guidance properties of the fiber and low background noise, the proposed sensor reached a detection limit down to 24 parts-per-billion by volume for CH4 and 144 parts-per-million by volume for CO2. The obtained results confirm the suitability of ARHCF for efficient use in gas sensing applications for over a broad spectral range. Thanks to the demonstrated low loss, such fibers with lengths of over one meter can be used for increasing the laser-gas molecules interaction path, substituting bulk optics-based multipass cells, while delivering required flexibility, compactness, reliability and enhancement in the sensor’s sensitivity.

Atomic spectroscopy and quantum optics in hollow-core waveguides

2010 ◽  
Vol 4 (6) ◽  
pp. 720-737 ◽  
Author(s):  
H. Schmidt ◽  
A.R. Hawkins
Keyword(s):  
Quantum Optics ◽  
Atomic Spectroscopy ◽  
Hollow Core
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