A5091310474- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Mechanical and Optical Resonators
- Analytical Chemistry and Sensors
- Advanced Fiber Laser Technologies
- CCD and CMOS Imaging Sensors
- Sensor Technology and Measurement Systems
- Gas Sensing Nanomaterials and Sensors
- Advanced Photonic Communication Systems
- Telecommunications and Broadcasting Technologies
- Video Surveillance and Tracking Methods
- Mobile Crowdsensing and Crowdsourcing
- Transportation and Mobility Innovations
- Advanced MIMO Systems Optimization
- Photonic Crystal and Fiber Optics
- Image Processing Techniques and Applications
- Electrochemical Analysis and Applications
- Fire Detection and Safety Systems
- Mobile Agent-Based Network Management
- Diamond and Carbon-based Materials Research
- Advanced Chemical Sensor Technologies
- Plasmonic and Surface Plasmon Research
- Advanced Vision and Imaging
- IoT-based Smart Home Systems
- Smart Parking Systems Research
National Institute of Technology Tiruchirappalli
2024
Hong Kong Polytechnic University
2020-2023
Photonics (United States)
2022
Institute of Nanotechnology
2021
Purdue University West Lafayette
2016-2021
University of Malaya
2018-2020
International Islamic University Chittagong
2020
East West University
2019
Technical University of Malaysia Malacca
2019
Islamic University of Technology
2019
Optical resonators with high quality factors (Qs) are promising for a variety of applications due to the enhanced nonlinearity and increased photonic density states at resonances. In particular, frequency combs (FCs) can be generated through four-wave mixing in high-Q microresonators made from Kerr nonlinear materials such as silica, silicon nitride, magnesium fluoride, calcium fluoride. These devices have potential on-chip metrology high-resolution spectroscopy, high-bandwidth...
A simple, reliable, and quick reactive Fabry-Pérot (FP) structure-based fiber optic pH sensor is presented. The pH-sensitive hydrogel single-mode (SMF) are placed inside a fused silica capillary to form the FP cavity. gel thickness characterized by spin coating method with respect different speeds. proposed shows sensitivity of 0.30 nm/pH along fast response time 15 s 20 for solvents in acidic range. Also, temperature FPI found be -0.56 nm/°C.
A compact, reliable, and fast responsive PCF (photonic crystal fiber) based modal interferometric sensor for lead ion detection is proposed experimentally demonstrated. The has been fabricated by splicing a small section of with SMF (single mode followed collapsing the air holes at its tip. interferometer dip coated chitosan-PVA (polyvinyl alcohol) glutathione functionalized gold nanoparticles. Three probes have fabricated, maximum sensitivity found to be 0.031 nm/ppb ions whereas range...
A biocompatible, reliable and quick responsive fiber-optic sensor based on Mach-Zehnder interferometer (MZI) is demonstrated for nitrate analytes tracing. The was constructed by collapsing the air holes of a short length photonic crystal fiber (PCF) with single-mode fibers (SMFs) both ways. proposed has been coated graphene-PVA (polyvinyl alcohol) membrane using thermal coating technique to make attractive ions in aqueous solution. maximum response found be 0.15 pm/ppm measurement scale 0...
A label-free-based fiber optic biosensor based on etched tilted Bragg grating (TFBG) is proposed and practically demonstrated. Conventional phase mask technic has been utilized to inscribe with a tilt angle of 10°, while the etching accomplished hydrofluoric acid. composite polyethylenimine (PEI)/poly(acrylic acid) (PAA) thermally deposited TFBG, followed by immobilization probe DNA (pDNA) this layer. The hybridization pDNA complementary (cDNA) monitored using wavelength-dependent...
Abstract The whispering gallery mode on the surface of microbottle optical resonator (MBR) was studied in this research paper as a relative temperature sensor. MBR is formed by technique known “soften-and-compress” allowed SMF-28 silica fiber to be bottle structure with diameter D b = 190 μm , stem s 125 and length L 182 . Q-factor defined excited bare microfiber 2 managed have >10 5 range between 40°C 100°C then employed sensor for analysis purpose. performance promising sensitivity...
We present a monolithic InP-based photonic integrated circuit (PIC) consisting of widely tunable laser master oscillator feeding an array semiconductor optical amplifiers that are interferometrically combined on-chip in single-mode waveguide. demonstrate stable and efficient coherent beam combination obtain up to 240 mW average power from the PIC, with 30–50 kHz Schawlow-Townes linewidths >180 across extended C-band. also explored hybrid integration amplifier PIC high quality factor...
Abstract This article compares the performances of uncoated and coated optical microbottle resonators (MBR) for humidity sensing. A technique called “soften‐and‐compress” was used to form MBR with midriff diameter D b = 190 μm , stem s 125 bottle length L 182 . The MBRs were prepared in three different conditions, which are noncoated MBR, PMMA (poly methyl meth acrylate) PVA (polyvinyl‐alcohol) MBR. characteristic investigated by employing a 2 tapered microfiber tested sensing within range...
In this paper, we present a high frame rate (HFR) color object tracking system that can automatically control its exposure time by executing brightness histogram-based image processing in real at rate. Our aim is to track high-speed objects even under dynamically changing illumination, such as lamps flickering 100 Hz, corresponding an AC power supply 50 / 60 Hz. vision system, which implemented histogram calculation circuit module parallel hardware logic on FPGA-based platform,...
We propose a 3-micron-radius, TE0/TE1 multiplexed 90-degree bend that numerically exhibits 0.8 dB bending loss and 20 crosstalk suppression over 30nm bandwidth on an silicon-on-insulator platform. An S-bend shows >37 colorless suppression.
We investigate the use of whispering gallery mode (WGM) optical microbottle resonator (MBR) as a sensor for liquid formaldehyde sensor. An MBR fabricated via "soften-and-compress" method with diameter 190 μm was optically excited by using non-adiabatic 2 microfibre and employed to measure concentrations between 0% 5%, results compared performance bare microfibre. The found have sensitivity 4.397 dB/% 90 % linearity were generally outperforms microfiber wide margin.
In this paper, we present a high frame rate (HFR) vision system that can automatically control its exposure time by executing brightness histogram-based image processing in real at rate. Our aim is to obtain high-quality HFR images for robust of high-speed phenomena even under dynamically changing illumination, such as lamps flickering 100 Hz, corresponding an AC power supply 50 / 60 Hz. simultaneously calculate 256-bin histogram 8-bit gray 512×512 pixels 2000 fps implementing calculation...
Optical microresonator frequency combs are inherently compact but require an external pump laser. We demonstrate heterogeneous assembly of InP high power tunable laser and SiN microring resonator with eye towards integrated comb generation.
The population of Dhaka city in Bangladesh is increasing rapidly. demand for public transport also with this population. Most the people use to go desired places as they are less expensive. In a crowded city, traffic jam, mismanagement system and some other issues cause not reach destination proper time. People had wait long time get their transport. Moreover, there security issue during night paper, we proposed framework management using crowdsourcing smartphones. This will help users find...
A highly sensitive Fabry-Pérot interferometer (FPI) based on chitosan coated capillary is demonstrated for lead sensing. The proposed sensor exhibits a sensitivity of -0.091 nm/ppm concentrations varying from 0 ppm to 30 ppm.
A high sensitive aqueous ammonia sensor based on tilted fiber Bragg grating (TFBG) had been reported. The sensors were fabricated by a 10 ° TFBG coated membrane receptor named as Polyaniline/Graphene oxide the surface of fiber. correlative concentrations demodulated global monitoring envelope area cladding modes in transmitted spectrum TFBG. Tests have shown that proposed can provide linear and rapid response within 22 seconds, concentration range from 1-12 ppm. Moreover, limit detection...
Device-to-Device (D2D) communication, a feature of LTE-Advanced, allows the UEs to communicate with each other directly, rather than hopping through eNodeB.It can offer many different advantages, including increased resource utilization.However, in underlay inband mode, D2D operation limited interference level is pivotal factor for expected outcome.This restricts feasibility setting up communication unless proper radio conditions be met.A prior estimation such help optimized handling...