scholarly journals Spectral Modulation of Optofluidic Coupled-Microdisk Lasers in Aqueous Media

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1439 ◽  
Author(s):  
Zhihe Guo ◽  
Haotian Wang ◽  
Chenming Zhao ◽  
Lin Chen ◽  
Sheng Liu ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Microfluidic Channel ◽  
Single Mode ◽  
Pump Light ◽  
Laser Spectrum ◽  
Spectral Modulation ◽  
Microcavity Laser ◽  
Potential Applications ◽  
Laser Systems ◽  
Doped Polymer

We present the spectral modulation of an optofluidic microdisk device and investigate the mechanism and characteristics of the microdisk laser in aqueous media. The optofluidic microdisk device combines a solid-state dye-doped polymer microdisk with a microfluidic channel device, whose optical field can interact with the aqueous media. Interesting phenomena, such as mode splitting and single-mode lasing in the laser spectrum, can be observed in two coupled microdisks under the pump laser. We modulated the spectra by changing the gap of the two coupled microdisks, the refractive indices of the aqueous media, and the position of a pump light, namely, selective pumping schemes. This optofluidic microlaser provides a method to modulate the laser spectra precisely and flexibly, which will help to further understand spectral properties of coupled microcavity laser systems and develop potential applications in photobiology and photomedicine.

scholarly journals Colloidal Gain Media: Single‐Mode Lasing from a Single 7 nm Thick Monolayer of Colloidal Quantum Wells in a Monolithic Microcavity (Laser Photonics Rev. 15(4)/2021)

2021 ◽  
Vol 15 (4) ◽  
pp. 2170024
Author(s):  
Sina Foroutan‐Barenji ◽  
Onur Erdem ◽  
Savas Delikanli ◽  
Huseyin Bilge Yagci ◽  
Negar Gheshlaghi ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Single Mode ◽  
Microcavity Laser ◽  
Gain Media

scholarly journals Opto-Microfluidic Fabry-Perot Sensor with Extended Air Cavity and Enhanced Pressure Sensitivity

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 19
Author(s):  
Pengfei Zhang ◽  
Chao Wang ◽  
Liuwei Wan ◽  
Qianqian Zhang ◽  
Zidan Gong ◽  
...  
Keyword(s):  
Static Pressure ◽  
Liquid Surface ◽  
Microfluidic Channel ◽  
Single Mode ◽  
Pressure Sensitivity ◽  
Air Cavity ◽  
Surface Reflection ◽  
Sensor Structure ◽  
Fabry Perot ◽  
Silica Capillary

An opto-microfluidic static pressure sensor based on a fiber Fabry-Perot Interferometer (FPI) with extended air cavity for enhancing the measuring sensitivity is proposed. The FPI is constructed in a microfluidic channel by the combination of the fixed fiber-end reflection and floating liquid surface reflection faces. A change of the aquatic pressure will cause a drift of the liquid surface and the pressure can be measured by detecting the shift of the FPI spectrum. Sensitivity of the sensor structure can be enhanced significantly by extending the air region of the FPI. The structure is manufactured by using a common single-mode optical fiber, and a silica capillary with the inner wall coated with a hydrophobic film. A sample with 3500 μm air cavity length has demonstrated the pressure sensitivity of about 32.4 μm/kPa, and the temperature cross-sensitivity of about 0.33 kPa/K.

Multi-jet ice 3D printing

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Pushkar Prakash Kamble ◽  
Subodh Chavan ◽  
Rajendra Hodgir ◽  
Gopal Gote ◽  
K.P. Karunakaran
Keyword(s):  
Design Methodology ◽  
Good Accuracy ◽  
Microfluidic Channel ◽  
Content Type ◽  
Water Ice ◽  
Volumetric Expansion ◽  
Low Viscosity ◽  
Wide Range ◽  
Water Layers ◽  
Potential Applications

Purpose Multi-jet deposition of the materials is a matured technology used for graphic printing and 3 D printing for a wide range of materials. The multi-jet technology is fine-tuned for liquids with a specific range of viscosity and surface tension. However, the use of multi-jet for low viscosity fluids like water is not very popular. This paper aims to demonstrate the technique, particularly for the water-ice 3 D printing. 3 D printed ice parts can be used as patterns for investment casting, templates for microfluidic channel fabrication, support material for polymer 3 D printing, etc. Design/methodology/approach Multi-jet ice 3 D printing is a novel technique for producing ice parts by selective deposition and freezing water layers. The paper confers the design, embodiment and integration of various subsystems of multi-jet ice 3 D printer. The outcomes of the machine trials are reported as case studies with elaborate details. Findings The prismatic geometries are realized by ice 3 D printing. The accuracy of 0.1 mm is found in the build direction. The part height tends to increase due to volumetric expansion during the phase change. Originality/value The present paper gives a novel architecture of the ice 3 D printer that produces the ice parts with good accuracy. The potential applications of the process are deliberated in this paper.

Maskless Laser Etching of Alumina and Ceramic Substrates

1990 ◽  
Vol 201 ◽  
Author(s):  
Jamal Khan
Keyword(s):  
Laser Emission ◽  
Removal Rate ◽  
Computer Software ◽  
Substrate Material ◽  
Device Fabrication ◽  
Ceramic Substrates ◽  
Potential Applications ◽  
Laser Systems ◽  
Scan Speed ◽  
Maskless Patterning

AbstractMaskless patterning of alumina (A12O3) films of various thicknesses and ceramic (TiC-Al2O3) substrate material was accomplished by using pulsed excimer and Nd:YAG laser systems. Etched structure size was defined through the computer software which also controls the workpiece position and laser operating parameters. Etch profile, materials removal rate and surface roughness was found to be dependent on laser emission wavelength, fluence, pulse rate and relative scan speed. Smoother etching was obtained with the excimer lasers. The etch characteristics are compared with those of the polymeric and metallic materials. Various potential applications of this laser based etching process in microelectronic and micromagnetic device fabrication are identified.

scholarly journals Modeling and Analysis of Opto-Fluidic Sensor for Lab-On- a-Chip Application

2017 ◽  
Author(s):  
Venkatesha M. ◽  
Chaya B. M. ◽  
Pattnaik P. K. ◽  
Narayan K.
Keyword(s):  
Continuous Flow ◽  
Microfluidic Channel ◽  
Optical Loss ◽  
Lab On A Chip ◽  
Single Mode ◽  
Fluidic Channel ◽  
Modeling And Analysis ◽  
Micro Particles ◽  
Sensing Applications ◽  
Integrated Optical

In this work modeling and analysis of an integrated opto-fluidic sensor, with a focus on achievement of single mode optical confinement and continuous flow of micro particles in the microfluidic channel for Lab-on-a Chip (LOC) sensing application is presented. This sensor consists of integrated optical waveguides, microfluidic channel among other integrated optical components. A continuous flow of micro particles in a narrow fluidic channel is achieved by maintaining the two sealed chambers at different temperatures and by maintaining a constant pressure of 1Pa at the centroid of narrow fluidic channel geometry. The analysis of silicon on insulator (SOI) integrated optical waveguide at an infrared wavelength of 1550nm for single mode sensing operation is presented. The optical loss is found to be 0.0005719dB/cm with an effective index of 2.2963. The model presented in this work can be effectively used to detect the nature of micro particles and continuous monitoring of pathological parameters for sensing applications.

scholarly journals Fiber Twist-based Wavelength Tunability in Tapered Optical Fiber Filters

2020 ◽  
Vol 28 (4) ◽  
Author(s):  
Maisarah Mansor ◽  
Afiqah Mohd Nawi ◽  
Nadiah Husseini Zainol Abidin ◽  
Muhammad Firdaus Omar ◽  
Mohd Adzir Mahdi ◽  
...  
Keyword(s):  
Extinction Ratio ◽  
Processing System ◽  
Single Mode ◽  
Physical Structure ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Laser Systems ◽  
Polarization Maintaining Fiber ◽  
Tapered Optical Fiber ◽  
Polarization Maintaining

This work demonstrates the tunability of tapered single mode fiber (SMF) and tapered polarization maintaining fiber (PMF) filters based on fiber twisting method. One end of the tapered fiber was twisted from 0o until 100o using the Vytran Fiber Processing System. Observation on the spectral output shows that the fiber twisting technique is a viable option to impart tunability in tapered fibers with total shift of 15 and 10 nm, respectively for SMF and PMF. Better tunability is observed in the SMF filter due to its simple physical structure and more straightforward interferometry effect but a significantly higher extinction ratio is observed for the PMF filter. Both filters exhibited region of linear wavelength shift with corresponding R2 values of 0.9924 and 0.9294 for SMF and PMF. The simplicity and reliability of the filter may pave the way for the development of a practical and compact tunable all-fiber filter for laser systems.

scholarly journals In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending

Sensors ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 205 ◽  
Author(s):  
Lei Ding ◽  
Yu Li ◽  
Cai Zhou ◽  
Min Hu ◽  
Yuli Xiong ◽  
...  
Keyword(s):  
Single Mode ◽  
Zehnder Interferometer ◽  
Swept Source ◽  
The Core ◽  
Biomedical Sensing ◽  
Highly Sensitive ◽  
Potential Applications ◽  
Core Fiber ◽  
Bending Sensor ◽  
Mach Zehnder Interferometer

A highly sensitive directional bending sensor based on a three-core fiber (TCF) Mach-Zehnder interferometer (MZI) is presented in this study. This MZI-based bending sensor was fabricated by fusion-splicing a section of TCF between two single-mode fibers (SMF) with core-offset. Due to the location of the core in the TCF, a bend applied to the TCF-based MZI led to an elongation or shortening of the core, which makes the sensor suitable for directional bending measurement. To analyze the bending characteristics, two types of TCF-based sensors, with the fusion-spliced core located at different positions between the SMFs, were investigated. A swept source was employed in the measurement technique. The experimental results showed that, for the two types of sensors in this setup, the bending sensitivities of the two sensors were 15.36 nm/m−1 and 3.11 nm/m−1 at the bending direction of 0°, and −20.48 nm/m−1 and −5.29 nm/m−1 at the bending direction of 180°. The temperature sensitivities of the two sensors were 0.043 nm/°C and 0.041 nm/°C, respectively. The proposed sensors are compact, versatile, inexpensive to fabricate, and are expected to have potential applications in biomedical sensing.

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