scholarly journals Bragg-Mirror-Assisted High-Contrast Plasmonic Interferometers: Concept and Potential in Terahertz Sensing

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1385
Author(s):  
Youqiao Ma ◽  
Jinhua Li ◽  
Zhanghua Han ◽  
Hiroshi Maeda ◽  
Yuan Ma
Keyword(s):  
High Contrast ◽  
Bragg Mirror ◽  
Plasmonic Sensors ◽  
New Horizons ◽  
Thz Wave ◽  
Sensing Applications ◽  
Wavelength Sensitivity ◽  
Sensing Platforms ◽  
Wide Wavelength Range ◽  
Interferometric Sensor

A Bragg-mirror-assisted terahertz (THz) high-contrast and broadband plasmonic interferometer is proposed and theoretically investigated for potential sensing applications. The central microslit couples the incident THz wave into unidirectional surface plasmon polaritons (SPPs) waves travelling to the bilateral Bragg gratings, where they are totally reflected over a wide wavelength range back towards the microslit. The properties of interference between the SPPs waves and transmitted THz wave are highly dependent on the surrounding material, offering a flexible approach for the realization of refractive index (RI) detection. The systematic study reveals that the proposed interferometric sensor possesses wavelength sensitivity as high as 167 μm RIU−1 (RIU: RI unit). More importantly, based on the intensity interrogation method, an ultrahigh Figure-of-Merit (FoM) of 18,750% RIU−1, surpassing that of previous plasmonic sensors, is obtained due to the high-contrast of interference pattern. The results also demonstrated that the proposed sensors are also quite robust against the oblique illumination. It is foreseen the proposed configuration may open up new horizons in developing THz plasmonic sensing platforms and next-generation integrated THz circuits.

Plasmonic metamaterials for chiral sensing applications

Nanoscale ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 58-66 ◽  
Author(s):  
Yoon Young Lee ◽  
Ryeong Myeong Kim ◽  
Sang Won Im ◽  
Mani Balamurugan ◽  
Ki Tae Nam
Keyword(s):  
Signal Enhancement ◽  
Plasmonic Sensors ◽  
Sensing Applications ◽  
Plasmonic Metamaterials ◽  
Chiral Sensing

Here, we will discuss the principles of recent issues in chiral sensing of plasmonic metamaterials, including suggested formulas for signal enhancement of chiral plasmonic sensors, and studies on platforms that employ different sensing mechanisms.

scholarly journals Fabrication of Patterned Integrated Electrochemical Sensors

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Muhammad Mujeeb-U-Rahman ◽  
Dvin Adalian ◽  
Axel Scherer
Keyword(s):  
Electrochemical Sensors ◽  
Measurement Techniques ◽  
Glucose Sensing ◽  
Small Surface ◽  
Fully Integrated ◽  
Nanoscale Patterning ◽  
Sensing Applications ◽  
Sensing Platforms ◽  
Integrated Microsystems ◽  
Electronic Measurement

Fabrication of integrated electrochemical sensors is an important step towards realizing fully integrated and truly wireless platforms for many local, real-time sensing applications. Micro/nanoscale patterning of small area electrochemical sensor surfaces enhances the sensor performance to overcome the limitations resulting from their small surface area and thus is the key to the successful miniaturization of integrated platforms. We have demonstrated the microfabrication of electrochemical sensors utilizing top-down lithography and etching techniques on silicon and CMOS substrates. This choice of fabrication avoids the need of bottom-up techniques that are not compatible with established methods for fabricating electronics (e.g., CMOS) which form the industrial basis of most integrated microsystems. We present the results of applying microfabricated sensors to various measurement problems, with special attention to their use for continuous DNA and glucose sensing. Our results demonstrate the advantages of using micro- and nanofabrication techniques for the miniaturization and optimization of modern sensing platforms that employ well-established electronic measurement techniques.

scholarly journals Refractive index sensitivity of Au nanostructures in solution and on the substrate

2021 ◽  
Author(s):  
Hemant Ramakant Hegde ◽  
Santhosh Chidangil ◽  
Rajeev K. Sinha
Keyword(s):  
Refractive Index ◽  
Colloidal Solution ◽  
Synthesis Method ◽  
Peak Position ◽  
Localized Surface Plasmon ◽  
Surface Immobilization ◽  
Refractive Index Sensitivity ◽  
Sensing Applications ◽  
Sensing Platforms ◽  
Index Sensitivity

AbstractIn this work, we present the synthesis and surface immobilization of Au nanostars, Au nanocubes and Au nanorods for localized surface plasmon resonance (LSPR)-based refractometric sensing applications. Au nanostructures exhibiting LSPR peak positions in 500–900 nm spectral range were prepared by seed-mediated synthesis method. The refractive index (RI) sensitivity of all these nanostructures in the colloidal solution were measured and the sample exhibiting highest sensitivity in each category were immobilized on the glass substrate. The surface immobilized nanostructures were investigated for RI sensing. Au nanostars having LSPR peak position at 767 nm exhibited highest RI sensitivity of 484 nm/RIU in solution and 318 nm/RIU on the substrate. This study gives an outline for selecting the Au nanostructures for developing plasmonic sensing platforms.

scholarly journals Recent Advances in Electrosynthesized Molecularly Imprinted Polymer Sensing Platforms for Bioanalyte Detection

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1204 ◽  
Author(s):  
Robert Crapnell ◽  
Alexander Hudson ◽  
Christopher Foster ◽  
Kasper Eersels ◽  
Bart Grinsven ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymers ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Biologically Relevant ◽  
Sensing Applications ◽  
Sensing Platforms ◽  
Target Analytes ◽  
Constant Potential ◽  
Number Of Publications ◽  
Potential Methods

The accurate detection of biological materials has remained at the forefront of scientific research for decades. This includes the detection of molecules, proteins, and bacteria. Biomimetic sensors look to replicate the sensitive and selective mechanisms that are found in biological systems and incorporate these properties into functional sensing platforms. Molecularly imprinted polymers (MIPs) are synthetic receptors that can form high affinity binding sites complementary to the specific analyte of interest. They utilise the shape, size, and functionality to produce sensitive and selective recognition of target analytes. One route of synthesizing MIPs is through electropolymerization, utilising predominantly constant potential methods or cyclic voltammetry. This methodology allows for the formation of a polymer directly onto the surface of a transducer. The thickness, morphology, and topography of the films can be manipulated specifically for each template. Recently, numerous reviews have been published in the production and sensing applications of MIPs; however, there are few reports on the use of electrosynthesized MIPs (eMIPs). The number of publications and citations utilising eMIPs is increasing each year, with a review produced on the topic in 2012. This review will primarily focus on advancements from 2012 in the use of eMIPs in sensing platforms for the detection of biologically relevant materials, including the development of increased polymer layer dimensions for whole bacteria detection and the use of mixed monomer compositions to increase selectivity toward analytes.

scholarly journals State-of-the-Art Optical Devices for Biomedical Sensing Applications—A Review

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 973
Author(s):  
N. L. Kazanskiy ◽  
S. N. Khonina ◽  
M. A. Butt ◽  
A. Kaźmierczak ◽  
R. Piramidowicz
Keyword(s):  
Optical Sensors ◽  
Low Cost ◽  
High Sensitivity ◽  
Sensor Technology ◽  
Biomedical Sensors ◽  
Plasmonic Sensors ◽  
Biomedical Sensing ◽  
Sensing Applications ◽  
Compact Size ◽  
Pros And Cons

Optical sensors for biomedical applications have gained prominence in recent decades due to their compact size, high sensitivity, reliability, portability, and low cost. In this review, we summarized and discussed a few selected techniques and corresponding technological platforms enabling the manufacturing of optical biomedical sensors of different types. We discussed integrated optical biosensors, vertical grating couplers, plasmonic sensors, surface plasmon resonance optical fiber biosensors, and metasurface biosensors, Photonic crystal-based biosensors, thin metal films biosensors, and fiber Bragg grating biosensors as the most representative cases. All of these might enable the identification of symptoms of deadly illnesses in their early stages; thus, potentially saving a patient’s life. The aim of this paper was not to render a definitive judgment in favor of one sensor technology over another. We presented the pros and cons of all the major sensor systems enabling the readers to choose the solution tailored to their needs and demands.

Patterned silver island paths as high-contrast optical sensing platforms

2021 ◽  
Vol 268 ◽  
pp. 115124
Author(s):  
Karolina Sulowska ◽  
Ewa Roźniecka ◽  
Kamil Wiwatowski ◽  
Marta Janczuk-Richter ◽  
Martin Jönsson-Niedziółka ◽  
...  
Keyword(s):  
Optical Sensing ◽  
High Contrast ◽  
Sensing Platforms ◽  
Silver Island

An ultrahigh-contrast and broadband on-chip refractive index sensor based on a surface-plasmon-polariton interferometer

The Analyst ◽  
2015 ◽  
Vol 140 (21) ◽  
pp. 7263-7270 ◽  
Author(s):  
Yujia Wang ◽  
Jianjun Chen ◽  
Chengwei Sun ◽  
Kexiu Rong ◽  
Hongyun Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Refractive Index Sensor ◽  
High Contrast ◽  
Plasmonic Sensors ◽  
High Figure ◽  
Plasmon Polariton ◽  
On Chip

By using a novel optical illumination scheme, high-contrast and broadband plasmonic sensors with ultra-high figure of merits are experimentally demonstrated.

High contrast grating VCSELs for sensing applications

2017 ◽  
Author(s):  
Magdalena Marciniak ◽  
Marcin Gębski ◽  
Maciej Dems ◽  
Krassimir Panajotov ◽  
Tomasz Czyszanowski
Keyword(s):  
High Contrast ◽  
Sensing Applications ◽  
High Contrast Grating
Sign in / Sign up

Export Citation Format

Share Document