scholarly journals Chirality Enhancement Using Fabry–Pérot-Like Cavity

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Jiaxin Bao ◽  
Ning Liu ◽  
Hanwei Tian ◽  
Qiang Wang ◽  
Tiejun Cui ◽  
...  
Keyword(s):  
Optical Rotation ◽  
Cavity Resonator ◽  
Life Forms ◽  
Chiral Molecule ◽  
Chiral Molecules ◽  
Sensing Applications ◽  
Fabry Perot ◽  
Conventional Technology ◽  
Order Of Magnitude ◽  
Chiral Sensing

Chiral molecules that do not superimpose on their mirror images are the foundation of all life forms on earth. Chiral molecules exhibit chiroptical responses, i.e., they have different electromagnetic responses to light of different circular polarizations. However, chiroptical responses in natural materials, such as circular dichroism and optical rotation dispersion, are intrinsically small because the size of a chiral molecule is significantly shorter than the wavelength of electromagnetic wave. Conventional technology for enhancing chiroptical signal entails demanding requirements on precise alignment of the chiral molecules to certain nanostructures, which however only leads to a limited performance. Herein, we show a new approach towards enhancement of chiroptical effects through a Fabry–Pérot (FP) cavity formed by two handedness-preserving metamirrors operating in the GHz region. We experimentally show that the FP cavity resonator can enhance the optical activity of the chiral molecule by an order of magnitude. Our approach may pave the way towards state-of-the-art chiral sensing applications.

scholarly journals Enhanced Near-Field Chirality in Periodic Arrays of Si Nanowires for Chiral Sensing

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 853 ◽  
Author(s):  
Emilija Petronijevic ◽  
Concita Sibilia
Keyword(s):  
Near Field ◽  
Chiral Molecule ◽  
Chiral Molecules ◽  
Si Nanowires ◽  
Simple Experiment ◽  
Excitation Scheme ◽  
Periodic Arrays ◽  
Optical Chirality ◽  
Resonant Modes ◽  
Chiral Sensing

Nanomaterials can be specially designed to enhance optical chirality and their interaction with chiral molecules can lead to enhanced enantioselectivity. Here we propose periodic arrays of Si nanowires for the generation of enhanced near-field chirality. Such structures confine the incident electromagnetic field into specific resonant modes, which leads to an increase in local optical chirality. We investigate and optimize near-field chirality with respect to the geometric parameters and excitation scheme. Specially, we propose a simple experiment for the enhanced enantioselectivity, and optimize the average chirality depending on the possible position of the chiral molecule. We believe that such a simple achiral nanowire approach can be functionalized to give enhanced chirality in the spectral range of interest and thus lead to better discrimination of enantiomers.

Continuous-Wave Cavity-Enhanced Polarimetry for Optical Rotation Measurement of Chiral Molecules

2021 ◽  
Vol 93 (13) ◽  
pp. 5403-5411
Author(s):  
Dang-Bao-An Tran ◽  
Katherine M. Manfred ◽  
Robert Peverall ◽  
Grant A. D. Ritchie
Keyword(s):  
Continuous Wave ◽  
Optical Rotation ◽  
Chiral Molecules ◽  
Rotation Measurement

scholarly journals Fabry-Pérot cavities based on photopolymerizable resins for sensing applications

2018 ◽  
Vol 8 (8) ◽  
pp. 2208 ◽  
Author(s):  
Ricardo Oliveira ◽  
Lúcia Bilro ◽  
Rogério Nogueira
Keyword(s):  
Sensing Applications ◽  
Fabry Perot

Enantiometric purity determination to 1 % level using a laser-based polarimetric HPLC detector

1990 ◽  
Vol 333 (1628) ◽  
pp. 166-168
Keyword(s):  
High Performance ◽  
Flicker Noise ◽  
Specific Rotation ◽  
Significant Advance ◽  
Chromatographic Peak ◽  
Chiral Molecule ◽  
Chiral Molecules ◽  
Noise Levels ◽  
Hplc Detector ◽  
Compact Design

The development of laser-based polarimetric detectors for high-performance liquid chromatography (HPLC) (Yeung et al . 1980; Bobbitt & Yeung 1986) with noise levels in the range of 0.1-10 p° has provided a significant advance in the quantitation of chiral molecules. We have designed an instrument based on an 820 nm diode laser which has the advantages of low source flicker noise and compact design (Lloyd et al . 1989). Detection limits were found to be in the range 0.1-2 pg, dependent on the specific rotation of the chiral molecule and the chromatographic peak width (Goodall et al. 1990).

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 Tripod-Loop Metasurfaces for Terahertz-Sensing Applications: A Comparison

2020 ◽  
Vol 10 (18) ◽  
pp. 6504
Author(s):  
Irati Jáuregui-López ◽  
Bakhtiyar Orazbayev ◽  
Victor Pacheco-Peña ◽  
Miguel Beruete
Keyword(s):  
Thin Film ◽  
Electric Field ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Ring Resonators ◽  
Film Sensor ◽  
Average Value ◽  
Sensing Applications ◽  
Order Of Magnitude ◽  
Hole Arrays

The high electric field intensity achieved on the surface of sensors based on metasurfaces (metasensors) makes them an excellent alternative for sensing applications where the volume of the sample to be identified is tiny (for instance, thin-film sensing devices). Various shapes and geometries have been proposed recently for the design of these metasensors unit-cells (meta-atoms) such as split ring resonators or hole arrays, among others. In this paper, we propose, design, and evaluate two types of tripod metasurfaces with different complexity in their geometry. An in-depth comparison of their performance is presented when using them as thin-film sensor devices. The meta-atoms of the proposed metasensors consist of a simple tripod and a hollow tripod structure. From numerical calculations, it is shown that the best geometry to perform thin-film sensing is the compact hollow tripod (due to the highest electric field on its surface) with a mean sensitivity of 3.72 × 10−5 nm−1. Different modifications are made to this structure to improve this value, such as introducing arms in the design and rotating the metallic pattern 30 degrees. The best sensitivity achieved for extremely thin film analytes (5–25 nm thick) has an average value of 1.42 × 10−4 nm, which translates into an extremely high improvement of 381% with respect to the initial hollow tripod structure. Finally, a comparison with other designs found in the literature shows that our design is at the top of the ranking, improving the overall performance by more than one order of magnitude. These results highlight the importance of using metastructures with more complex geometries so that a higher electric field intensity distribution and, therefore, designs with better performance can be obtained.

scholarly journals Ultrashort Long-Period Fiber Gratings Inscribed on a Single-Mode Fiber for Torsion Sensing Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Marta Nespereira ◽  
João M. P. Coelho ◽  
José Manuel Rebordão
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Fiber Grating ◽  
Long Period ◽  
Sensing Applications ◽  
High Tension ◽  
Long Period Fiber Gratings ◽  
Order Of Magnitude ◽  
Period Fiber Grating

The response of ultrashort-length CO2-induced long-period fiber grating (LPFG) sensors to torsion is reported. While engraving using CO2 laser radiation, the fiber is submitted to high tension allowing the obtainment of gratings with shorter lengths, down to 2.4 mm, which is almost one order of magnitude lower than the usual. Also, the fiber is only irradiated in one side, creating an asymmetrical profile leading to highly birefringent gratings. Sensitivity to axial twists is demonstrated, with values up to 0.15 nm/(rad/m) for the resonant wavelength shift and higher than 0.03 dBm/(rad/m) for the variation in the intensity (attenuation). Discrimination between rotation directions, clockwise and counterclockwise, was observed.

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