scholarly journals Selective Polymer Distributed Bragg Reflector Vapor Sensors

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1161 ◽  
Author(s):  
Paola Lova
Keyword(s):  
Bragg Reflector ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflector ◽  
Polymer Medium ◽  
Volatile Organic ◽  
Vapor Sensors ◽  
Benzene Toluene ◽  
Uv Visible ◽  
Photonic Sensors ◽  
Detection And Recognition

We report on Flory–Huggins photonic sensors for the selective detection of volatile organic compounds without the use of any chemical functionalization. For this purpose, we employed periodic multilayers made of inert cellulose acetate alternated to active polystyrene films whose free volume was modified with silanized ZnO nanoparticles. The simple UV-visible (UV-vis) dynamic optical response of such polymer distributed Bragg reflectors during exposure to vapors of benzene, toluene, o-dichlorobenzene, and carbon tetrachloride allows their detection and recognition based on different chemico–physical affinity with the active polymer medium.

Amorphous silicon Bragg reflectors fabricated by oblique angle deposition

2012 ◽  
Vol 1396 ◽  
Author(s):  
S. J. Jang ◽  
C. I. Yeo ◽  
Y. T. Lee
Keyword(s):  
Stop Band ◽  
Contrast Material ◽  
Bragg Reflector ◽  
Material System ◽  
Oblique Angle Deposition ◽  
Bragg Reflectors ◽  
Oblique Angle ◽  
Distributed Bragg Reflector ◽  
High Index Contrast ◽  
Angle Deposition

ABSTRACTWe demonstrate the highly reflective broadband a-Si distributed Bragg reflector fabricated by oblique angle deposition. By tuning the refractive index of a-Si film, the high index contrast material system was achieved. The broadband reflective characteristics of a-Si distributed Bragg reflector were investigated by calculation and fabrication. The broad stop band (Δλ/λ=33.7%, R>99%) with only a five-pair a-Si distributed Bragg reflector was achieved experimentally at center wavelength of 650, 980, and 1550 nm. The size-, feature- and substrate-independent method for highly reflective Bragg reflectors was realized by simple oblique angle evaporation.

scholarly journals High reflectance III-Nitride Bragg reflectors grown by molecular beam epitaxy

2000 ◽  
Vol 5 (S1) ◽  
pp. 28-34
Author(s):  
H. M. Ng ◽  
T. D. Moustakas
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Electron Cyclotron Resonance ◽  
Bragg Reflector ◽  
Transmission Matrix ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflector ◽  
Reflectance Data ◽  
Resonance Plasma ◽  
High Reflectance

Distributed Bragg reflector (DBR) structures based on AlN/GaN have been grown on (0001) sapphire by electron-cyclotron-resonance plasma-assisted molecular-beam epitaxy (ECR-MBE). The design of the structures was predetermined by simulations using the transmission matrix method. A number of structures have been grown with 20.5 – 25.5 periods showing peak reflectance ranging from the near-UV to the green wavelength regions. For the best sample, peak reflectance up to 99% was observed centered at 467 nm with a bandwidth of 45 nm. The experimental reflectance data were compared with the simulations and show excellent agreement with respect to peak reflectance, bandwidth of high reflectance and the locations of the sidelobes.

High Reflectance III-Nitride Bragg Reflectors Grown by Molecular Beam Epitaxy

1999 ◽  
Vol 595 ◽  
Author(s):  
H. M. Ng ◽  
T. D. Moustakas
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Electron Cyclotron Resonance ◽  
Bragg Reflector ◽  
Transmission Matrix ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflector ◽  
Reflectance Data ◽  
Resonance Plasma ◽  
High Reflectance

AbstractDistributed Bragg reflector (DBR) structures based on AlN/GaN have been grown on (0001) sapphire by electron-cyclotron-resonance plasma-assisted molecular-beam epitaxy (ECR-MBE). The design of the structures was predetermined by simulations using the transmission matrix method. A number of structures have been grown with 20.5 – 25.5 periods showing peak reflectance ranging from the near-UV to the green wavelength regions. For the best sample, peak reflectance up to 99% was observed centered at 467 nm with a bandwidth of 45 nm. The experimental reflectance data were compared with the simulations and show excellent agreement with respect to peak reflectance, bandwidth of high reflectance and the locations of the sidelobes.

scholarly journals Continuously Tuning Distributed Bragg Reflector Erbium Doped Fiber Laser

2008 ◽  
Vol 14 (2) ◽  
pp. 111-118
Author(s):  
Tran Thi Tam ◽  
Vu Ngoc Cham ◽  
Dang Quoc Trung ◽  
Tran Anh Vu ◽  
Le Huu Minh
Keyword(s):  
Fiber Laser ◽  
Cavity Length ◽  
Bragg Reflection ◽  
Single Mode ◽  
Bragg Reflector ◽  
Emission Wavelength ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflector ◽  
Erbium Doped ◽  
Linear Configuration

The linear configuration single-mode Distributed Bragg Reflection (DBR) Erbium doped Fiber laser has been tested. The cavity length of the laser utilizing intracore Bragg reflectors, no longer than one centimetre and the grating bandwidth is below ~ 0.2 nm. The 1.55-$\mu$m emission wavelength of the laser can be continously tuned within 2 nm.

scholarly journals InGaAs metamorphic laser power converters with distributed Bragg reflector for wavelength range λ=1 – 1.1 µm

2020 ◽  
Author(s):  
Nikolay A. Kalyuzhnyy ◽  
Viktor M. Emelyanov ◽  
Sergey A. Mintairov ◽  
Mariia V. Nahimovich ◽  
Roman A. Salii ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Laser Power ◽  
Power Converters ◽  
Bragg Reflector ◽  
Distributed Bragg Reflector
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