Photonic crystal fiber integrated microfluidic chip for highly sensitive real-time chemical sensing

A photonic crystal fiber (PCF) with high relative sensitivity was designed and investigated for the detection of chemical analytes in the terahertz (THz) regime. To ease the complexity, an extremely simple cladding employing four struts is adopted, which forms a rectangular shaped core area for filling with analytes. Results of enormous simulations indicate that a minimum 87.8% relative chemical sensitivity with low confinement and effective material absorption losses can be obtained for any kind of analyte, e.g., HCN (1.26), water (1.33), ethanol (1.35), KCN (1.41), or cocaine (1.50), whose refractive index falls in the range of 1.2 to 1.5. Besides, the PCF can also achieve high birefringence (∼0.01), low and flat dispersion, a large effective modal area, and a large numerical aperture within the investigated frequency range from 0.5 to 1.5 THz. We believe that the proposed PCF can be applied to chemical sensing of liquid and THz systems requiring wide-band polarization-maintaining transmission and low attenuation.

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A Highly Sensitive, Polarization Maintaining Photonic Crystal Fiber Sensor Operating in the THz Regime

Photonics ◽

10.3390/photonics5040040 ◽

2018 ◽

Vol 5 (4) ◽

pp. 40 ◽

Cited By ~ 7

Author(s):

Sohel Rana ◽

Nirmala Kandadai ◽

Harish Subbaraman

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

High Sensitivity ◽

Relative Sensitivity ◽

Computational Technique ◽

The Finite Element Method ◽

High Birefringence ◽

Crystal Fiber ◽

Highly Sensitive ◽

Imaging And Spectroscopy

In this paper, a high sensitivity, polarization preserving photonic crystal fiber (PCF), based on circular air holes for sensing in the terahertz (THz) band, is presented. The finite element method, a practical and precise computational technique for describing the interactions between light and matter, is used to compute the modal properties of the designed fiber. For the designed PCF, comprising of circular air holes in both the cladding and in the porous core, a relative sensitivity of 73.5% and a high birefringence of 0.013 are achieved at 1.6 THz. The all circular air-hole structure, owing to its simplicity and compatibility with the current fiber draw technique for PCF fabrication, can be realized practically. It is anticipated that the designed fiber can be employed in applications such as detection of biological samples and toxic chemicals, imaging, and spectroscopy.

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Highly sensitive SERS detection of cancer proteins in low sample volume using hollow core photonic crystal fiber

Biosensors and Bioelectronics ◽

10.1016/j.bios.2011.12.056 ◽

2012 ◽

Vol 33 (1) ◽

pp. 293-298 ◽

Cited By ~ 89

Author(s):

Dinish U. S. ◽

Chit Yaw Fu ◽

Kiat Seng Soh ◽

Bhuvaneswari Ramaswamy ◽

Anil Kumar ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Sample Volume ◽

Hollow Core ◽

Crystal Fiber ◽

Highly Sensitive ◽

Sers Detection

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A highly sensitive D-type photonic crystal fiber infrared sensor with indium tin oxide based on surface plasmon resonance

Modern Physics Letters B ◽

10.1142/s0217984921504996 ◽

2021 ◽

Author(s):

Wei Liu ◽

Chunjie Hu ◽

Lei Zhou ◽

Zao Yi ◽

Ying Shi ◽

...

Keyword(s):

Surface Plasmon Resonance ◽

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Surface Plasmon ◽

Tin Oxide ◽

Plasmon Resonance ◽

Indium Tin Oxide ◽

Type Structure ◽

Crystal Fiber ◽

Highly Sensitive

A highly sensitive surface plasmon resonance (SPR) sensor composed of a photonic crystal fiber (PCF) with the D-type structure is designed and analyzed by the full-vector finite element method (FEM). Indium tin oxide (ITO) is adopted as the plasmonic substance on account of the low cost and controllable infrared range (1500–2600 nm). By optimizing the structural parameters, the sensor shows a maximum wavelength sensitivity of 46,000 nm/RIU and average sensitivity of 13,166.67 nm/RIU for analyte refractive indexes between 1.355 and 1.385. This PCF combining a circular layout and D-type structure offers excellent sensitivity while the deposition and manufacturing complexity can be reduced. This sensor will possess an extremely expansive development space in the field of chemical analysis and environmental safety.

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Comparative study of the highly sensitive plasmonic sensor based on a D-Shaped photonic crystal fiber with silver or gold layers

Physica Scripta ◽

10.1088/1402-4896/ac418d ◽

2021 ◽

Author(s):

Bahar Meshginqalam ◽

Jamal Barvestani

Keyword(s):

Photonic Crystal ◽

Comparative Study ◽

Photonic Crystal Fiber ◽

Structural Parameters ◽

Simultaneous Detection ◽

Plasmonic Sensor ◽

Plasmonic Material ◽

Sensor Performance ◽

Crystal Fiber ◽

Highly Sensitive

Abstract A highly sensitive D-shaped photonic crystal fiber sensor with circular lattice is proposed for external plasmonic sensing. The proposed design of plasmonic material in a D-shaped form eﬀectively facilitates the excitation of surface plasmons and enhances the sensor performance. As a comparative study, two different plasmonic materials, gold and silver, are applied D-shapely on the fiber and the proposed sensor performance is numerically investigated and evaluated. Moreover, the optimized structural parameters such as air-hole diameters and the thickness of silver and gold layers are selected via simulation results which cause the highest sensitivity of 40000nm/RIU for the gold coated fiber using the wavelength interrogation method. Furthermore, the maximum figure of merit can reach 621.50RIU-1. Analytes with the refractive indices ranging from 1.34 to 1.39 can be detected by double-loss peak that is a more reliable method of simultaneous detection and verification of sensing characteristics. Due to its promising results, the proposed sensor can be widely useful in the area of chemical and biological sensing.

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