Zobrazeno 1 - 10
of 1 123
pro vyhledávání: '"Werner HOFMANN"'
Mixed-gas CH4/CO2/CO detection based on linear variable optical filter and thermopile detector array
Autor:
Shaoda Zhang, Wu Bin, Binbin Xu, Xingyu Zheng, Binbin Chen, Xueqin Lv, Haisheng San, Werner Hofmann
Publikováno v:
Nanoscale Research Letters, Vol 14, Iss 1, Pp 1-9 (2019)
Abstract This paper presents the design, fabrication, and characterization of a middle-infrared (MIR) linear variable optical filter (LVOF) and thermopile detectors that will be used in a miniaturized mixed gas detector for CH4/CO2/CO measurement. Th
Externí odkaz:
https://doaj.org/article/0fef55e73d1e444abd6147bc6a55a674
Autor:
Lingli Guo, Fahard Salimi, Hao Wang, Werner Hofmann, Graham R. Johnson, Brett G. Toelle, Guy B. Marks, Lidia Morawska
Publikováno v:
Environment International, Vol 145, Iss , Pp 106094- (2020)
A critical element of the risk assessment of exposure to airborne ambient ultrafine particles (UFP) is the quantification of respiratory tract deposition (RTD) of the particles, which is intrinsically challenging, particularly at the population scale
Externí odkaz:
https://doaj.org/article/50c106d0aa5d43eeb7b64a026991ab27
Publikováno v:
IEEE Photonics Journal, Vol 10, Iss 6, Pp 1-8 (2018)
In this paper, we demonstrated vertical-cavity surface-emitting laser (VCSEL) arrays with improved thermal stability by arranging the mesa distribution within the array in a nonlinear configuration. Based on our traversal design algorithm, VCSEL arra
Externí odkaz:
https://doaj.org/article/77577ca33ad6444181f221c6bf16fba8
Autor:
Youwen Huang, Xing Zhang, Jianwei Zhang, Yiyang Xie, Werner Hofmann, Yongqiang Ning, Lijun Wang
Publikováno v:
IEEE Photonics Journal, Vol 9, Iss 4, Pp 1-8 (2017)
In this paper, we report on high beam quality vertical-cavity surface-emitting lasers (VCSELs) featuring a monolithically integrated aspherical microlens. This lens is fabricated by a one-step diffusion-limited wet etch process. VCSELs with microlens
Externí odkaz:
https://doaj.org/article/64612f48111a4a0985b591fc14497c05
Publikováno v:
Photonics, Vol 7, Iss 1, p 13 (2020)
In this work, a general equivalent circuit model based on the carrier reservoir splitting approach in high-performance multi-mode vertical-cavity surface-emitting lasers (VCSELs) is presented. This model accurately describes the intrinsic dynamic beh
Externí odkaz:
https://doaj.org/article/a494498ddcc0481b86f23e85cb69f10f
Autor:
Werner Hofmann, Dieter Bimberg
Publikováno v:
IEEE Photonics Journal, Vol 4, Iss 5, Pp 1831-1843 (2012)
Future high-performance computers require optical interconnects with aggregated Exa-Byte/s data transport. Densely packed arrays of vertical-cavity surface-emitting lasers (VCSELs) might present the only feasible technical solution. The high-speed pr
Externí odkaz:
https://doaj.org/article/613517f8c49c433cb7bb3ea930c77e59
Publikováno v:
Atmosphere, Vol 1, Iss 1, Pp 3-14 (2010)
This study monitored ultrafine particles (UFP) concurrent with environmental air quality data, investigating whether already existing instrumentation used by environmental authorities can provide reference values for estimating UFP concentrations. Of
Externí odkaz:
https://doaj.org/article/42dcb738e22e499a9fde421e20843224
Autor:
Werner Hofmann
Publikováno v:
IEEE Photonics Journal, Vol 2, Iss 5, Pp 802-815 (2010)
InP-based, vertical-cavity surface-emitting lasers (VCSELs) utilizing a buried tunnel junction (BTJ) emitting at 1.55 μm with improved active region and reduced parasitics are demonstrated. A superior modulation bandwidth > 10 GHz is achieved up to
Externí odkaz:
https://doaj.org/article/e464334204c541b4b7db541f39f18dcf
Autor:
Werner Hofmann, Chris Chase, Michael Müller, Yi Rao, Christian Grasse, Gerhard Böhm, Markus-Christian Amann, Connie J. Chang-Hasnain
Publikováno v:
IEEE Photonics Journal, Vol 2, Iss 3, Pp 415-422 (2010)
A novel long-wavelength vertical-cavity surface-emitting laser (VCSEL) structure based on a subwavelength high-contrast grating (HCG) as the output mirror has been realized. By design, these devices are highly polarization stable, are single mode at
Externí odkaz:
https://doaj.org/article/fecd488db7114029800fd709ca60f8c0
Autor:
Samridha Kunwar, Hazal Goksu, Jim Hinton, Harm Schoorlemmer, Andrew Smith, Werner Hofmann, Felix Werner
Publikováno v:
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1050, pp. 1-11
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1050, 1-11
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1050, 1-11
Ground-level particle detection is now a well-established approach to TeV gamma-ray astronomy. Detection of Cherenkov light produced in water-filled detection units is a proven and cost-effective method. Here we discuss the optimization of the units
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::113c99a9c1b6f164192cd9247dbf1822
https://hdl.handle.net/2066/290775
https://hdl.handle.net/2066/290775