High Symmetry of the Mode Field Distribution Photonic Crystal Fiber with High Birefringence

A novel high birefringence and nearly zero dispersion-flattened photonic crystal fiber (PCF) with elliptical defected core (E-DC) and equilateral pentagonal architecture is designed. By applying the full-vector finite element method (FEM), the characteristics of electric field distribution, birefringence, and chromatic dispersion of the proposed E-DC PCF are numerically investigated in detail. The simulation results reveal that the proposed PCF can realize high birefringence, ranging from 10-3 to 10-2 orders of magnitude, owing to the embedded elliptical air hole in the core center. However, the existence of the elliptical air hole gives rise to an extraordinary electric field distribution, where a V-shaped notch appears and the size of the V-shaped notch varies at different operating wavelengths. Also, the mode field diameter is estimated to be about 2 μm, which implies the small effective mode area and highly nonlinear coefficient. Furthermore, the investigation of the chromatic dispersion characteristic shows that the introduction of the elliptical air hole is helpful to control the chromatic dispersion to be negative or nearly zero flattened over a wide wavelength bandwidth.

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A Highly Birefringent Photonic Crystal Fiber for Terahertz Spectroscopic Chemical Sensing

Sensors ◽

10.3390/s21051799 ◽

2021 ◽

Vol 21 (5) ◽

pp. 1799

Author(s):

Tianyu Yang ◽

Liang Zhang ◽

Yunjie Shi ◽

Shidi Liu ◽

Yuming Dong

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Chemical Sensing ◽

Numerical Aperture ◽

Wide Band ◽

Relative Sensitivity ◽

Chemical Sensitivity ◽

High Birefringence ◽

Crystal Fiber ◽

Polarization Maintaining

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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Photonic crystal fiber with anomalous dispersion behavior and high birefringence

2015 International Conference on Applied and Theoretical Computing and Communication Technology (iCATccT) ◽

10.1109/icatcct.2015.7456927 ◽

2015 ◽

Author(s):

Pranaw Kumar ◽

Priyanka Das

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Anomalous Dispersion ◽

High Birefringence ◽

Crystal Fiber ◽

Dispersion Behavior

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Nonlinear photonic crystal fiber with high birefringence made of silicate glass

10.1117/12.664028 ◽

2006 ◽

Author(s):

Przemyslaw Szarniak ◽

Matteo Foroni ◽

Ryszard Buczynski ◽

Dariusz Pysz ◽

Piotr Wasylczyk ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Silicate Glass ◽

High Birefringence ◽

Crystal Fiber ◽

Nonlinear Photonic Crystal

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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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