scholarly journals Porous silicon ring resonator for compact, high sensitivity biosensing applications

2015 ◽  
Vol 23 (6) ◽  
pp. 7111 ◽  
Author(s):  
Gilberto A. Rodriguez ◽  
Shuren Hu ◽  
Sharon M. Weiss
Keyword(s):  
Porous Silicon ◽  
Ring Resonator ◽  
High Sensitivity

scholarly journals Complex Permittivity Characterization of Liquid Samples Based on a Split Ring Resonator (SRR)

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3385
Author(s):  
Jialu Ma ◽  
Jingchao Tang ◽  
Kaicheng Wang ◽  
Lianghao Guo ◽  
Yubin Gong ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Complex Permittivity ◽  
Ring Resonator ◽  
High Sensitivity ◽  
Split Ring Resonator ◽  
Debye Model ◽  
Split Ring ◽  
Liquid Samples ◽  
Microwave Sensor

A complex permittivity characterization method for liquid samples has been proposed. The measurement is carried out based on a self-designed microwave sensor with a split ring resonator (SRR), the unload resonant frequency of which is 5.05 GHz. The liquid samples in capillary are placed in the resonant zone of the fabricated senor for high sensitivity measurement. The frequency shift of 58.7 MHz is achieved when the capillary is filled with ethanol, corresponding a sensitivity of 97.46 MHz/μL. The complex permittivity of methanol, ethanol, isopropanol (IPA) and deionized water at the resonant frequency are measured and calibrated by the first order Debye model. Then, the complex permittivity of different concentrations of aqueous solutions of these materials are measured by using the calibrated sensor system. The results show that the proposed sensor has high sensitivity and accuracy in measuring the complex permittivity of liquid samples with volumes as small as 0.13 μL. It provides a useful reference for the complex permittivity characterization of small amount of liquid chemical samples. In addition, the characterization of an important biological sample (inositol) is carried out by using the proposed sensor.

scholarly journals Real-Time and In-Flow Sensing Using a High Sensitivity Porous Silicon Microcavity-Based Sensor

Sensors ◽  
2017 ◽  
Vol 17 (12) ◽  
pp. 2813 ◽  
Author(s):  
Raffaele Caroselli ◽  
David Martín Sánchez ◽  
Salvador Ponce Alcántara ◽  
Francisco Prats Quilez ◽  
Luis Torrijos Morán ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Real Time ◽  
High Sensitivity ◽  
Flow Sensing

Multi-slot stack-type ring resonator for high sensitivity biosensor and low voltage optical modulator

2013 ◽  
Author(s):  
Yoshiteru Amemiya ◽  
Tomoya Taniguchi ◽  
Takeshi Ikeda ◽  
Masataka Fukuyama ◽  
Akio Kuroda ◽  
...  
Keyword(s):  
Ring Resonator ◽  
Low Voltage ◽  
High Sensitivity ◽  
Optical Modulator

High-sensitivity optical sensor based on cascaded a FP Etalon and a ring resonator

2017 ◽  
Author(s):  
Hui-Hui Zhu ◽  
Yong-Heng Yue ◽  
Ya-Jie Wang ◽  
Min Zhang ◽  
Jian-Jun He ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Ring Resonator ◽  
High Sensitivity

Porous Silicon Nanostructured Materials for Sensing Applications: Molecular Assembling and Electrochemical or Optical Evaluation

2016 ◽  
Vol 1812 ◽  
pp. 77-82
Author(s):  
J. Márquez ◽  
M. De la Cruz-Guzmán ◽  
L.F. Cházaro ◽  
G. Palestino
Keyword(s):  
Porous Silicon ◽  
Optical Sensors ◽  
Detection Threshold ◽  
Environmental Pollutants ◽  
High Sensitivity ◽  
Hybrid Nanostructures ◽  
Specular Reflectance ◽  
Sensing Applications ◽  
Fluorescent Ligands ◽  
Hybrid Devices

ABSTRACTPorous silicon (PSi) combines the potential of miniaturization with a very large surface area. The PSi surface can be chemically modified resulting in a high sensitivity (low detection threshold) device for chemical and biomolecular sensing. In previous work, we have shown that redox proteins and fluorescent ligands can be infiltrated into PSi (PSiMc) structures. The hybrid devices have shown interesting new properties produced by the coupling of the individual properties of PSi nanostructures and the modifiers. In this work, we have obtained a PSiMc/redox protein bioelectrode, which presents a quasi-reversible electrochemical response. This effect was attributed to the semiconducting nature of the PSi substrate and to the functional groups of the crosslinking molecules (MPTS), which together produce a capacitive effect on the device. On the other hand, the chemical modification of PSiMc with fluorescent ligands allowed us to fabricate fluorescent PSi hybrid nanostructures, which were tested for the detection of environmental pollutants such as heavy metals (specifically Hg2+). We found that the selectivity of this optical device depends on the selected recognizing molecule. The captured metal induces the formation of a metallic complex that shows higher fluorescence compared with the sensor device. These results demonstrate the viability of using porous silicon as optical sensors and electrochemical biosensors. The infiltration of fluorescent recognizing molecules and proteins into the PSi matrix were evaluated by specular reflectance, FTIR spectroscopy, fluorescence spectroscopy and cyclic voltammetry.

High sensitivity NO2 sensor based on CuO/p-porous silicon heterojunction at room temperature

2016 ◽  
Vol 685 ◽  
pp. 364-369 ◽  
Author(s):  
Xiangcheng Liu ◽  
Ming Hu ◽  
Yifei Wang ◽  
Junfeng Liu ◽  
Yuxiang Qin
Keyword(s):  
Porous Silicon ◽  
Room Temperature ◽  
High Sensitivity ◽  
No2 Sensor
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