scholarly journals Electrochemistry in an Optical Fiber Microcavity - Optical Monitoring of Electrochemical Processes in Picoliter Volumes

2021 ◽  
Author(s):  
Tomasz Gabler ◽  
Andrzej Krześniak ◽  
Monika Janik ◽  
Anna Myśliwiec ◽  
Marcin Koba ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Fiber ◽  
Near Infrared ◽  
Single Mode ◽  
Optical Measurements ◽  
Femtosecond Laser Micromachining ◽  
Optical Readout ◽  
Electrochemical Processes ◽  
The Difference ◽  
Electrochemical Phenomena

In this work, we demonstrate a novel method for multi-domain analysis of properties of analytes in volumes as small as picoliter, combining electrochemistry and optical measurements. A microcavity in-line Mach-Zehnder interferometer (µIMZI) obtained in a standard single-mode optical fiber using femtosecond laser micromachining was able to accommodate a microelectrode and optically monitor electrochemical processes inside the fiber. The interferometer shows exceptional sensitivity to changes in optical properties of analytes in the microcavity. We show that the optical readout follows the electrochemical reactions. Here, the redox probe (ferrocenedimethanol) undergoing reactions of oxidation and reduction changes the optical properties of the analyte (refractive index and absorbance) that are monitored by the µIMZI. Measurements have been supported by numerical analysis of both optical and electrochemical phenomena. On top of a capability of the approach to perform analysis in microscale, the difference between oxidized and reduced forms in the near-infrared can be clearly measured using the µIMZI, which is hardly possible using other optical techniques. The proposed multi-domain concept is a promising approach for highly reliable and ultrasensitive chemo- and biosensing.

scholarly journals Electrochemistry in an Optical Fiber Microcavity - Optical Monitoring of Electrochemical Processes in Picoliter Volumes

2021 ◽  
Author(s):  
Tomasz Gabler ◽  
Andrzej Krześniak ◽  
Monika Janik ◽  
Anna Myśliwiec ◽  
Marcin Koba ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Fiber ◽  
Near Infrared ◽  
Single Mode ◽  
Optical Measurements ◽  
Femtosecond Laser Micromachining ◽  
Optical Readout ◽  
Electrochemical Processes ◽  
The Difference ◽  
Electrochemical Phenomena

In this work, we demonstrate a novel method for multi-domain analysis of properties of analytes in volumes as small as picoliter, combining electrochemistry and optical measurements. A microcavity in-line Mach-Zehnder interferometer (µIMZI) obtained in a standard single-mode optical fiber using femtosecond laser micromachining was able to accommodate a microelectrode and optically monitor electrochemical processes inside the fiber. The interferometer shows exceptional sensitivity to changes in optical properties of analytes in the microcavity. We show that the optical readout follows the electrochemical reactions. Here, the redox probe (ferrocenedimethanol) undergoing reactions of oxidation and reduction changes the optical properties of the analyte (refractive index and absorbance) that are monitored by the µIMZI. Measurements have been supported by numerical analysis of both optical and electrochemical phenomena. On top of a capability of the approach to perform analysis in microscale, the difference between oxidized and reduced forms in the near-infrared can be clearly measured using the µIMZI, which is hardly possible using other optical techniques. The proposed multi-domain concept is a promising approach for highly reliable and ultrasensitive chemo- and biosensing.

scholarly journals Optical Measurements on Solids of Possible Interstellar Importance

1973 ◽  
Vol 52 ◽  
pp. 297-301 ◽  
Author(s):  
Donald R. Huffman ◽  
James L. Stapp
Keyword(s):  
Optical Properties ◽  
Wavelength Range ◽  
Optical Constants ◽  
Near Infrared ◽  
Large Change ◽  
Optical Measurements ◽  
Ultraviolet A ◽  
Peculiar Characteristic ◽  
Far Ultraviolet

Optical constants of olivine – (Mg, Fe)2SiO4 and magnetite – Fe3O4 are presented for the wavelength range from near infrared to far ultraviolet. A feature occurs in the optical constants of olivine at about 1460 Å, but no structure that could give rise to a 2200 Å interstellar feature is found. The most peculiar characteristic of the magnetite results is the large change of optical properties with temperature in the infrared.

Electrochemistry in an optical fiber microcavity - optical monitoring of electrochemical processes in picoliter volumes

Lab on a Chip ◽  
2021 ◽  
Author(s):  
Tomasz Gabler ◽  
Andrzej Krzesniak ◽  
Monika Janik ◽  
Anna Katarzyna Mysliwiec ◽  
M Koba ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Domain Analysis ◽  
Optical Measurements ◽  
Optical Monitoring ◽  
Electrochemical Processes ◽  
Novel Method

In this work, we demonstrate a novel method for multi-domain analysis of properties of analytes in volumes as small as picoliter, combining electrochemistry and optical measurements. A microcavity in-line Mach-Zehnder...

scholarly journals A microfluidic system for analysis of electrochemical processing using a highly sensitive optical fiber microcavity

2021 ◽  
Author(s):  
Andrzej Krześniak ◽  
Tomasz Gabler ◽  
Monika Janik ◽  
Marcin Koba ◽  
Martin Jönsson-Niedziółka ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Flow Direction ◽  
High Sensitivity ◽  
Side Surface ◽  
Single Mode ◽  
Microfluidic System ◽  
Optical Measurements ◽  
Injection System ◽  
Highly Sensitive ◽  
Static Conditions

Microfluidics provide unique possibilities to control tiny volumes of liquids and their composition. To effectively benefit from the advantages of microfluidic solutions they need to be supported by interrogation subsystems, at best also matching the miniature scale. In this work we combined with a microfluidic system a Microcavity in-line Mach-Zehnder Interferometer (µIMZI) induced in the side surface of a single-mode optical fiber using a femtosecond laser micromachining. The µIMZI shows capability for investigating optical properties of as small as picoliter volumes with an exceptionally high sensitivity. Here we report numerical analysis and experimental results that show that when the µIMZI is incorporated with the microfluidic system the measurements can be performed with sensitivity exceeding 14,000 nm/RIU which is similar to measurements done under static conditions. In a flow injection system we show that a certain amount of liquid and flow rate are required to effectively exchange the liquid in the microcavity, while orientation of the cavity versus the flow direction has a minor impact on the exchange. Finally, we have supported the system by band electrodes making it possible to induce redox reactions in the microchannel and optical detection of flowing products of the reactions. It has been found that thanks to the high sensitivity of the µIMZI the products of the reactions can be clearly detected both electrochemically and optically even when the only part of the flowing redox probe is oxidized at the band electrode. This work proves that the proposed solution may offer highly sensitive optical measurements, even when the chemical reactions are not effective in the whole volume of the system.

Near infrared imaging of micro-structured polymer-metal surface pattern

2010 ◽  
Vol 18 (2) ◽  
Author(s):  
J. Han ◽  
J. Lee ◽  
T. Lee ◽  
J. Kang
Keyword(s):  
Optical Fiber ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Single Mode ◽  
Metal Electrode ◽  
Surface Pattern ◽  
Organic Transistor ◽  
Polymer Metal ◽  
Surface Patterns

AbstractTwo-dimensional infrared scanning microscopy images of micro-structured surface patterns in an organic transistor device with metal electrode stripes on a polymer channel layer have been demonstrated. A compact single mode optical fiber scanning probe which has a micro dome-shape lens at the tip end was used for the scanning in which reflected beam intensities are coupled back to the optical fiber transceiver depending on the returned power of the sample material. Based on the experiment, the obtained structural dimensions of the micro structure specimen were well matched to the designed ones. These images were compared to the digital microscopy photos for a potential usage to conduct not only the in situ microscopic electrode pattern monitoring of the device but also to non-destructively investigate any surface reflecting material in micrometer scales.

scholarly journals Linear and nonlinear optical properties of carbon nanotube-coated single-mode optical fiber gratings

2011 ◽  
Vol 36 (11) ◽  
pp. 2104 ◽  
Author(s):  
Guillermo E. Villanueva ◽  
Michael B. Jakubinek ◽  
Benoit Simard ◽  
Claudio J. Oton ◽  
Joaquín Matres ◽  
...  
Keyword(s):  
Optical Properties ◽  
Carbon Nanotube ◽  
Optical Fiber ◽  
Nonlinear Optical ◽  
Single Mode ◽  
Nonlinear Optical Properties ◽  
Fiber Gratings ◽  
Single Mode Optical Fiber ◽  
Optical Fiber Gratings ◽  
Linear And Nonlinear

scholarly journals Dynamic Characterization of Macrobending Loss Optical Fiber-Based Load Sensor

2021 ◽  
Vol 3 (1) ◽  
pp. 74-82
Author(s):  
Bambang Widiyatmoko ◽  
Mefina Y. Rofianingrum
Keyword(s):  
Optical Fiber ◽  
Output Voltage ◽  
Single Mode ◽  
Vehicle Speed ◽  
Dynamic Characterization ◽  
Source Characterization ◽  
Sensor Material ◽  
Sensor Resistance ◽  
The Difference

The weight of vehicles passing through the road greatly affects road damage, so it is necessary to have a non-stop weighing system or Weight in Motion (WIM). In this study, the dynamic characterization of the WIM sensor was carried out based on the principle of optical fiber macrobending. In this study, a single-mode step-index optical fiber was used as the sensor material and a laser diode with a power of 5 mW and a wavelength of 1,550 nm as a light source. Characterization was carried out by running over the sensor using a motor with three variations of speed, namely 10 km/hour, 15 km/hour, and 20 km/hour. Two different conditions were also carried out, namely, the sensor was directly crushed and the sensor was reinforced in the form of a half-cylinder wooden beam. The test was carried out with three different types of sensors. From the observations, data shows that the addition of a beam can increase the accuracy of the reading as seen from the smaller the difference in the output voltage reading for the same type of sensor and vehicle speed. Besides that, there is a strengthening of the sensor resistance up to 10 times which is known from the sensor output voltage where the voltage at the addition of the beam is 1/10 of the reading without the beam. This is due to an increase in the sensor area exposed to the load.

scholarly journals A microfluidic system for analysis of electrochemical processing using a highly sensitive optical fiber microcavity and a microfluidic system

2021 ◽  
Author(s):  
Andrzej Krześniak ◽  
Tomasz Gabler ◽  
Monika Janik ◽  
Marcin Koba ◽  
Martin Jönsson-Niedziółka ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Flow Direction ◽  
High Sensitivity ◽  
Side Surface ◽  
Single Mode ◽  
Microfluidic System ◽  
Optical Measurements ◽  
Injection System ◽  
Highly Sensitive ◽  
Static Conditions

Microfluidics provide unique possibilities to control tiny volumes of liquids and their composition. To effectively benefit from the advantages of microfluidic solutions they need to be supported by interrogation subsystems, at best also matching the miniature scale. In this work we combined with a microfluidic system a Microcavity in-line Mach-Zehnder Interferometer (µIMZI) induced in the side surface of a single-mode optical fiber using a femtosecond laser micromachining. The µIMZI shows capability for investigating optical properties of as small as picoliter volumes with an exceptionally high sensitivity. Here we report numerical analysis and experimental results that show that when the µIMZI is incorporated with the microfluidic system the measurements can be performed with sensitivity exceeding 14,000 nm/RIU which is similar to measurements done under static conditions. In a flow injection system we show that a certain amount of liquid and flow rate are required to effectively exchange the liquid in the microcavity, while orientation of the cavity versus the flow direction has a minor impact on the exchange. Finally, we have supported the system by band electrodes making it possible to induce redox reactions in the microchannel and optical detection of flowing products of the reactions. It has been found that thanks to the high sensitivity of the µIMZI the products of the reactions can be clearly detected both electrochemically and optically even when the only part of the flowing redox probe is oxidized at the band electrode. This work proves that the proposed solution may offer highly sensitive optical measurements, even when the chemical reactions are not effective in the whole volume of the system.

Improvement of Wall Plug Efficiency in Near Infrared Lateral Single-mode LDs at High Temperature

2013 ◽  
Vol 133 (8) ◽  
pp. 1471-1475
Author(s):  
Tetsuya Yagi ◽  
Takuto Maruyama ◽  
Masayuki Kusunoki ◽  
Naoyuki Shimada ◽  
Muneharu Miyashita
Keyword(s):  
High Temperature ◽  
Near Infrared ◽  
Single Mode ◽  
Wall Plug Efficiency

scholarly journals The Effect of Nitrogen Incorporation on the Optical Properties of Si-Rich a-SiCx Films Deposited by VHF PECVD

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 637
Author(s):  
Hongliang Li ◽  
Zewen Lin ◽  
Yanqing Guo ◽  
Jie Song ◽  
Rui Huang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Chemical Vapor ◽  
Wide Bandgap ◽  
Nonradiative Recombination ◽  
Very High Frequency ◽  
N Content ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
N Incorporation

The influence of N incorporation on the optical properties of Si-rich a-SiCx films deposited by very high-frequency plasma-enhanced chemical vapor deposition (VHF PECVD) was investigated. The increase in N content in the films was found to cause a remarkable enhancement in photoluminescence (PL). Relative to the sample without N incorporation, the sample incorporated with 33% N showed a 22-fold improvement in PL. As the N content increased, the PL band gradually blueshifted from the near-infrared to the blue region, and the optical bandgap increased from 2.3 eV to 5.0 eV. The enhancement of PL was suggested mainly from the effective passivation of N to the nonradiative recombination centers in the samples. Given the strong PL and wide bandgap of the N incorporated samples, they were used to further design an anti-counterfeiting label.

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