scholarly journals Numerical Optimization of Refractive Index Sensors Based on Diffraction Gratings with High Aspect Ratio in Terahertz Range

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 172
Author(s):  
Oleg Kameshkov ◽  
Vasily Gerasimov ◽  
Boris Knyazev
Keyword(s):  
Refractive Index ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Diffraction Gratings ◽  
High Sensitivity ◽  
Label Free ◽  
Subwavelength Gratings ◽  
Refractive Index Sensors ◽  
Traditional Approaches ◽  
2D And 3D

Terahertz surface plasmon resonance (SPR) sensors have been regarded as a promising technology in biomedicine due to their real-time, label-free, and ultrasensitive monitoring features. Different authors have suggested a lot of SPR sensors, including those based on 2D and 3D metamaterials, subwavelength gratings, graphene, and graphene nanotube, as well as others. However, one of the traditional approaches to realize high sensitivity SPR sensors based on metal diffraction gratings has been studied poorly in the terahertz frequency range. In this article, a linear metal rectangular diffraction grating with high aspect ratio is studied. The influence of the grating structure parameters on the sensor sensitivity is simulated. Effects arising from different ratios of depth and width were discovered and explained. The results show that the sensitivity can be increased to 2.26 THz/RIU when the refractive index range of the gas to measure is between 1 and 1.002 with the resolution 5×10−5 RIU.

High sensitivity refractive index sensing with strong light confinement in high-aspect-ratio U-cavity arrays

2014 ◽  
Vol 202 ◽  
pp. 137-143 ◽  
Author(s):  
Yaerim Lee ◽  
Etsuo Maeda ◽  
Ya-Lun Ho ◽  
Shigenori Fujikawa ◽  
Jean-Jacques Delaunay
Keyword(s):  
Refractive Index ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
High Sensitivity ◽  
Strong Light ◽  
Light Confinement ◽  
Refractive Index Sensing

Label-free biosensing by means of periodic lattices of high aspect ratio SU-8 nano-pillars

2010 ◽  
Vol 25 (12) ◽  
pp. 2553-2558 ◽  
Author(s):  
M. Holgado ◽  
C.A. Barrios ◽  
F.J. Ortega ◽  
F.J. Sanza ◽  
R. Casquel ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Label Free

Strain, torsion and refractive index sensors based on helical long period fibre grating inscribed in small-core fibre for structural condition monitoring

2021 ◽  
Vol 24 (6) ◽  
pp. 1248-1255
Author(s):  
Cailing Fu ◽  
Yi-Qing Ni ◽  
Tong Sun ◽  
Yiping Wang ◽  
Siqi Ding ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Structural Condition ◽  
Core Diameter ◽  
Small Core ◽  
Long Period ◽  
Sensing Applications ◽  
Core Fibre ◽  
Refractive Index Sensors

This study is intended to develop long period fibre grating sensors for potential applications in environmental and durability monitoring of coastal structures. High-quality helical long period fibre gratings (HLPFGs) are inscribed in different types of small-core single mode fibre (SMF) by use of hydrogen-oxygen flame heating technique. A detailed investigation of the effect of core diameter on their transmission spectrum and optimum length of the HLPFG has been pursued. A longer length is required to achieve the same coupling attenuation in a smaller-core SMF than that of a larger-core fibre. The strain, torsion and refractive index (RI) properties of the HLPFG is investigated experimentally to develop a high-sensitivity sensor. The experimental results show that the strain sensitivity could be enhanced by means of employing a larger-core diameter SMF. Moreover, the HLFPGs are also sensitive to the torsion and external RI. Hence, such HLFPGs have great potential for sensing applications.

scholarly journals TCAD Simulations of High-Aspect-Ratio Nano-biosensor for Label-Free Sensing Application

2021 ◽  
Author(s):  
Rakshita Pritam Singh Dhar ◽  
Naveen Kumar ◽  
Cristina Medina-Bailon ◽  
Cesar Pascual Garcia ◽  
Vihar Petkov Georigiev
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Label Free ◽  
Sensing Application ◽  
Tcad Simulations

scholarly journals Compact Inner-Wall Grating Slot Microring Resonator for Label-Free Sensing

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 5038 ◽  
Author(s):  
Hongjun Gu ◽  
He Gong ◽  
Chunxue Wang ◽  
Xiaoqiang Sun ◽  
Xibin Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Sodium Chloride ◽  
High Sensitivity ◽  
Microring Resonator ◽  
Silicon On Insulator ◽  
Label Free ◽  
Detection Range ◽  
Sodium Chloride Solutions ◽  
Sensing Application ◽  
Index Unit

In this paper, we present and analyze a compact inner-wall grating slot microring resonator (IG-SMRR) with the footprint of less than 13 μm × 13 μm on the silicon-on-insulator (SOI) platform for label-free sensing, which comprises a slot microring resonator (SMRR) and inner-wall grating (IG). Its detection range is significantly enhanced without the limitation of the free spectral region (FSR) owing to the combination of SMRR and IG. The IG-SMRR has an ultra-large quasi-FSR of 84.5 nm as the detection range, and enlarged factor is up to over 3 compared with the conventional SMRR. The concentration sensitivities of sodium chloride solutions and D-glucose solutions are 996.91 pm/% and 968.05 pm/%, respectively, and the corresponding refractive index (RI) sensitivities are 559.5 nm/RIU (refractive index unit) and 558.3 nm/RIU, respectively. The investigation on the combination of SMRR and IG is a valuable exploration of label-free sensing application for ultra-large detection range and ultra-high sensitivity in future.

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