A5044722377- Photonic and Optical Devices
- Analytical Chemistry and Sensors
- Spectroscopy and Laser Applications
- Engineering Education and Pedagogy
- Biomedical and Engineering Education
- Design Education and Practice
- Advanced Chemical Sensor Technologies
- Mass Spectrometry Techniques and Applications
- Advanced Fiber Optic Sensors
- Spectroscopy and Quantum Chemical Studies
- Gas Sensing Nanomaterials and Sensors
- Advanced Fiber Laser Technologies
- Quantum, superfluid, helium dynamics
- Mechanical and Optical Resonators
Texas A&M University
2020-2022
College Station Medical Center
2020
Mitchell Institute
2020
Abstract Mid-infrared (mid-IR) sensors consisting of silicon nitride (SiN) waveguides were designed and tested to detect volatile organic compounds (VOCs). SiN thin films, prepared by low-pressure chemical vapor deposition (LPCVD), have a broad mid-IR transparent region lower refractive index (n = 2.0) than conventional materials such as Si 3.4), which leads stronger evanescent wave therefore higher sensitivity, confirmed finite-difference eigenmode (FDE) calculation. Further, in-situ...
This work focuses on the development of nanoparticle-based layer-by-layer (LbL) coatings for enhancing detection sensitivity and selectivity volatile organic compounds (VOCs) using on-chip mid-infrared (MIR) waveguides (WGs). First, we demonstrate construction conformal polymer/mesoporous silica nanoparticles (MSNs) surface Si-based WGs LbL technique evaluate coating deposition conditions, such as pH substrate withdrawal speed, thickness homogeneity assemblies. We then use modified to...
Chip-scale infrared spectrometers consisting of a microring resonator array (MRA) were developed for volatile organic compound (VOC) detection. The MRA is serially positioned to serve as wavelength sorting element that enables demultiplexing. Unlike conventional devices operated by single microring, our can perform multiwavelength mid-infrared (mid-IR) sensing routing the resonant light from broadband mid-IR source into different channels. Miniaturized spectrometer fabricated on transparent...
Functionalization of optical waveguides with submicron coatings zinc peroxide (ZnO2) and silica (SiO2) nanoparticles (NPs) is reported that enabled selective concentration acetone vapors in the vicinity waveguide, boosting sensitivity a mid infrared (MIR) on-chip detector. Controlled thickness was achieved by introducing precise control substrate withdrawal speed to layer-by-layer (LbL) deposition technique.
Abstract This paper reports the use of silane monolayers different polarities to enable recognition and selective interfacial enrichment nonpolar versus polar gases for spectroscopic mid‐infrared (MIR) on‐chip sensing. However, detection using waveguides (WGs) is challenging because low concentrations gas molecules within evanescent field surrounding WGs. To solve this issue, high‐surface‐area, precisely‐controlled‐thickness nanocoatings are introduced whose surface modification with...