Comparison of half-wave phase retarder and quarter-wave phase retarder

2020 ◽  
Author(s):  
Bei Zhang ◽  
Xinyun Zhu ◽  
Tianyu Xiao
Keyword(s):  
Wave Phase ◽  
Half Wave ◽  
Quarter Wave

scholarly journals An Achromatic Quarter-Wave and Half Wave Phase Retarder Combination Operating in Near-Infrared (NIR) Region

2019 ◽  
Vol 9 (1) ◽  
pp. 6029-6031
Keyword(s):  
Near Infrared ◽  
Optical Systems ◽  
Infrared Range ◽  
Wave Phase ◽  
Half Wave ◽  
Comparable Performance ◽  
Quarter Wave ◽  
Near Infrared Range ◽  
Sub Wavelength ◽  
Phase Retarders

Optical phase retarders are major components in design of different optical systems. Normally these retarders exhibit retardance which varies with wavelength. But achromatic phase retardation is necessary in optical system design. These achromatic phase retarders can be designed using different waveplates, sub-wavelength grating (SWG), liquid crystals, and polymers etc in different wavelength ranges. Present communication focus on designing of quarter-wave phase retarder in the near infrared range (NIR) with waveplates of different birefringent materials having different thicknesses. This system in NIR range shows comparable performance with those developed with SWGs and it also removes some drawbacks. The proposed system deals with an achromatic combination of four birefringent plates in 800–2000 nm range using Sapphire, CdSe, Calcite, and Rutile crystals having good transmittance in the NIR range. This system can also be used as a half wave phase retarder in NIR.

scholarly journals Switchable Quarter-Wave Plate and Half-Wave Plate Based on Phase-Change Metasurface

2020 ◽  
Vol 12 (2) ◽  
pp. 1-10 ◽  
Author(s):  
Yaru Li ◽  
Jun Luo ◽  
Xiong Li ◽  
Mingbo Pu ◽  
Xiaoliang Ma ◽  
...  
Keyword(s):  
Phase Change ◽  
Quarter Wave Plate ◽  
Half Wave Plate ◽  
Wave Plate ◽  
Half Wave ◽  
Quarter Wave

Quarter-wave phase-compensating multidielectric lens design using genetic algorithms

2004 ◽  
Vol 44 (2) ◽  
pp. 165-169 ◽  
Author(s):  
Lei Sun ◽  
Evor L. Hines ◽  
Christos Mias ◽  
Roger Green ◽  
Daciana Udrea
Keyword(s):  
Genetic Algorithms ◽  
Lens Design ◽  
Wave Phase ◽  
Quarter Wave

Compact filtering power dividers with wide upper stopband

2019 ◽  
Vol 11 (08) ◽  
pp. 765-773
Author(s):  
Gaoya Dong ◽  
Weimin Wang ◽  
Yuanan Liu
Keyword(s):  
Transmission Lines ◽  
Wave Transmission ◽  
Coupling Matrix ◽  
Power Dividers ◽  
Full Wave ◽  
Half Wave ◽  
Coupled Lines ◽  
Quarter Wave ◽  
Simulation Results ◽  
Good Agreement

AbstractA series of compact filtering power dividers (FPDs) with simple layouts are proposed based on coupling topology. The structure of the presented FPD1 is composed of three resonators and one isolating resistor. These FPDs can be designed based on coupling matrix filter theory. A half-wave transmission line is employed in FPD2 to introduce a transmission zero (TZ) locating at 1.27f0. The FPD3 is designed by replacing quarter-wave transmission lines in FPD2 with quarter-wave coupled lines, which will produce a TZ locating at 1.96 f0 and extend upper stopband bandwidth. For verification, three FPDs centered at 2.45 GHz are fabricated and measured. All measured results are in good agreement with the full-wave simulation results.

scholarly journals Continuously Wavelength-Tunable First-Order Narrowband Fiber Comb Filter Using Composite Combination of Wave Retarders

2020 ◽  
Vol 10 (18) ◽  
pp. 6150
Author(s):  
Jaehoon Jung ◽  
Yong Wook Lee
Keyword(s):  
Principal Axis ◽  
Beam Splitter ◽  
Orientation Angle ◽  
Comb Filter ◽  
First Order ◽  
High Birefringence ◽  
Filter Structure ◽  
Half Wave ◽  
Quarter Wave ◽  
Polarizing Beam Splitter

Here, by harnessing a composite combination of wave retarders, we propose and experimentally demonstrate a first-order narrowband fiber comb filter capable of continuously tuning its wavelength, of which the filter structure is on the fundamental basis of a polarization–diversity loop structure. The demonstrated comb filter consists of a polarizing beam splitter (PBS), two high birefringence fiber (HBF) segments of the same length, an ordered wave retarder combination (WRC) of a quarter-wave retarder (QWR) and a half-wave retarder (HWR) before the first HBF segment, and an ordered WRC of an HWR and a QWR before the second HBF segment. The second HBF segment is butt-coupled to one port of the PBS so that its principal axis should be 22.5° away from the horizontal axis of the PBS. Taking the filter transmittance obtained by Jones calculus into consideration, we found the azimuth orientation angle (AOA) sets of the four wave retarders, which could allow extra phase shifts (ψ’s) ranging from 0° to 360° to be induced in the narrowband transmittance function. From filter transmission spectra calculated according to the AOA sets found above, it is confirmed that the first-order narrowband comb spectrum can be continuously tuned by properly controlling the AOA’s, clearly indicating the continuous wavelength tunability based on a composite combination of ordered wave retarders. This theoretical prediction was verified by actually constructing the proposed filter. Then, it is concluded that our filter employing the composite combination of wave retarders can be continuously frequency-tuned by properly controlling the AOA’s of the wave retarders.

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