Abstract:2018). High-Q and temperature stable photonic biosensor based on grating waveguides. This is the accepted version of the paper. This version of the publication may differ from the final published version. Permanent repository link: http://openaccess.city.ac.uk/20188/ Link to published version: http://dx.
Abstract.In this work, analytical modeling and parameter evaluation of a photonic biosensor using cascaded silicon grating waveguides is illustrated. The sensor design consists of two cascaded waveguides with … Show more
“…Bragg gratings have been widely applied in the rapidly growing field of optical sensors [15][16][17][18]. As one of most popular sensing elements fiber Bragg grating (FBG) can measure a series of physical quantities including temperature [19], humidity [20], pressure [21], strain [22], etc.…”
In this paper, a temperature-insensitive ferrofluid (FF)-clad microfiber Bragg Grating (MF-BG) magnetic field sensor is proposed. Through optimizing the diameter of MF-BG, we can effectively suppress its thermal property. The experimental research results show that when the diameter of MF-BG is ~2.94 μm, its reflection spectrum shift owing to ambient temperature change can be substantially small within the range of 20–80 °C. The thermal stable sensor has a magnetic field sensitivity of 0.667 pm/Gs with a linearity of more than 0.985 at 20 °C.
“…Bragg gratings have been widely applied in the rapidly growing field of optical sensors [15][16][17][18]. As one of most popular sensing elements fiber Bragg grating (FBG) can measure a series of physical quantities including temperature [19], humidity [20], pressure [21], strain [22], etc.…”
In this paper, a temperature-insensitive ferrofluid (FF)-clad microfiber Bragg Grating (MF-BG) magnetic field sensor is proposed. Through optimizing the diameter of MF-BG, we can effectively suppress its thermal property. The experimental research results show that when the diameter of MF-BG is ~2.94 μm, its reflection spectrum shift owing to ambient temperature change can be substantially small within the range of 20–80 °C. The thermal stable sensor has a magnetic field sensitivity of 0.667 pm/Gs with a linearity of more than 0.985 at 20 °C.
“…Controlling, manipulating and amplifying EM waves are the most noteworthy and intriguing consequences, which PCs could demonstrate from themselves. The PBG based PCs are typically used in the following fields: microfluidic and biomedical sensors [15], polarization splitter [16], solar cells [17,18], Terahertz Sensor [19,20], integrated circuits [21], photovoltaic devices [22], photonic filters [23], etc.…”
Although there has been a focus on THz lters so far, there is a signifcant defciency in advancing low-temperature THz lters. According to the needs, we proposed a tunable THz lter that selectively permits the desired incident frequencies to be propagated in relevance with our purpose. The presence of a low-temperature nano superconductor and an undoped semiconductor layers in the proposed structure resulted in a multi-channel THz lter, which could be highly tuned with several parameters such as lattice constants, applied temperature, etc. The achieved transmittance spectra revealed that the emerged transmittance couples and stacks follow exact regulations. Furthermore, the structure exhibited omnidirectional band-gaps for both TE and TM polarized waves. Moreover, the use of a central defect layer gave some transmittance defect modes in
the forbidden areas. This structure could be used in some THz devices such as switches, optimized sensors as well as in space industry and telecommunications.
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