Multi-wavelength achromatic bifocal metalenses with controllable polarization-dependent functions for switchable focusing intensity

2021 ◽  
Author(s):  
Long Chen ◽  
Zhenglong Shao ◽  
Jia Liu ◽  
Dongliang Tang
Keyword(s):  
Optical Communication ◽  
Relative Intensity ◽  
Polarized Light ◽  
Polarization Direction ◽  
Dispersion Engineering ◽  
Multi Wavelength ◽  
Optical Applications ◽  
Spatially Varying ◽  
Simple Rotation ◽  
Multicolor Display

Abstract In this paper, bifocal metalens are designed through simultaneously controlling two polarization-dependent functions, which can respectively focus x-polarized and y-polarized light into different positions, and the relative intensity between two foci can be continuously tuned through a simple rotation of the incident linear polarization direction. The proposed metalenses are composed of rectangle nanopillars with spatially varying widths and lengths, which provide distinct propagating phases under two orthogonal polarizations. Therefore, there exists a freedom of degree to achieve two polarization-dependent focusing functions. More importantly, these nanopillars possess the excellent dispersion engineering, and provide an effective way for the realization of achromatic bifocal metalenses. After powerful optimizations, two achromatic bifocal metalenses are constructed and further demonstrated numerically. The x-polarized and y-polarized components are focused into different positions under different working wavelengths. Simulated results agree well with our designs. The approach here is expected to find optical applications in micro-manipulation, optical communication and multicolor display.

Numerical modelling of relative intensity noise (RIN) transfer as a result of four-wave mixing in optical communication links

2019 ◽  
pp. 4-13
Author(s):  
Тимофей Михайлович Федотенко ◽  
Анастасия Евгеньевна Беднякова
Keyword(s):  
Optical Communication ◽  
Relative Intensity ◽  
Signal Propagation ◽  
Four Wave Mixing ◽  
Relative Intensity Noise ◽  
Communication Link ◽  
Wave Mixing ◽  
Intensity Noise ◽  
Signal Degradation ◽  
Communication Links

Выполнено исследование распространения сигнала в волоконной линии связи с сонаправленной накачкой. Несмотря на невозможность переноса шумов из накачки в сигнал в результате вынужденного комбинационного рассеяния (ВКР), в натурном эксперименте наблюдается деградация сигнала уже при небольших длинах распространения (порядка 5-10 км). Для исследования причин деградации сигнала построена численная модель на основе обобщенного нелинейного уравнения Шрёдингера, учитывающая дисперсию высших порядков, керровскую нелинейность и запаздывающий рамановский отклик среды. Также используется более реалистичная модель многомодового источника накачки. В результате проведенного численного анализа продемонстрировано, что в определенных условиях не только ВКР, но и четырехволновое смешение может инициировать в линиях связи процесс переноса шумов из накачки в сигнал. It is well known that any real transmission link introduces distortions into the signal that can be either recoverable or not fully removable. The sources of such unremovable distortions leading to the loss of information are double Rayleigh scattering, amplified spontaneous emission, RIN (Relative Intensity Noise) transfer and nonlinear interactions such as four-wave mixing. In this paper we perform numerical investigation of signal propagation and RIN transfer in optical communication link with co-propagating pump. Despite the impossibility of intensity noise transfer from pump to signal due to stimulated Raman scattering (SRS), in the experiment signal degradation is observed even at small propagation lengths of 5-10 km. To find the origin of signal degradation, a numerical model is proposed based on the generalized nonlinear Schr¨odinger equation. The model takes into account the higher-order dispersion, Kerr nonlinearity, and the delayed Raman response of the medium. A more realistic model of the multimode pumping source is also employed. It is worth noting, that the most common analytical and numerical models, describing RIN transfer from pump to signal, are based on balance equations and neglects influence of dispersive and nonlinear effects. As a result of the numerical analysis, it was demonstrated that not only SRS but also four-wave mixing can initiate the process of noise transfer from pump to signal in the communication links.

Photoinduced alignment of liquid crystals parallel to the polarization direction of linearly polarized light

2003 ◽  
Vol 13 (4) ◽  
pp. 669-671 ◽  
Author(s):  
Chunying Xu ◽  
Takeshi Shiono ◽  
Tomiki Ikeda ◽  
Yinghan Wang ◽  
Yasumasa Takeuchi
Keyword(s):  
Liquid Crystals ◽  
Polarized Light ◽  
Polarization Direction ◽  
Linearly Polarized

scholarly journals Interference with polarized light beams: Generation of spatially varying polarization

2009 ◽  
Vol 77 (12) ◽  
pp. 1135-1143 ◽  
Author(s):  
B. M. Rodríguez-Lara ◽  
I. Ricardez-Vargas
Keyword(s):  
Polarized Light ◽  
Spatially Varying ◽  
Light Beams

Multi-Wavelength Bits Generation by Mesh Ring Resonator System for Optical Communication Security Application

2014 ◽  
Vol 979 ◽  
pp. 487-490
Author(s):  
Phichai Youplao ◽  
Nithiroth Pornsuwancharoen ◽  
P.P. Yupapin
Keyword(s):  
Optical Communication ◽  
Pulse Propagation ◽  
Ring Resonator ◽  
Communication Security ◽  
Light Pulses ◽  
Optical Pulse Propagation ◽  
Multi Wavelength ◽  
Resonator System ◽  
Nonlinear Behaviors ◽  
Security Application

We propose a new design of the mesh ring resonator system device using the nonlinear behaviors of optical pulse propagation in the ring resonator system, where the disadvantages of nonlinearity of light pulses propagating in the propose system becomes beneficial. The simulation results obtained have shown the chaotic output signals that can be generated by Kerr effects in the ring resonator system, where the bits logic decision signals can be controlled by using the specify system parameters, the ring radii, the coupling coefficient and the threshold outputs intensity, of the proposed simulation system. The potential of using such the mesh ring resonator system device for optical communication security application is performed and discussed.

scholarly journals Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2698
Author(s):  
Nurperi Yavuz ◽  
Mustafa Mert Bayer ◽  
Hüseyin Ozan Ҫirkinoğlu ◽  
Ali Serpengüzel ◽  
Thien Le Phu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Polarized Light ◽  
Tunable Laser ◽  
Infrared Region ◽  
Nitrogen Vacancy ◽  
Quality Factors ◽  
High Quality ◽  
Near Surface ◽  
Optical Applications ◽  
Bulk Diamond

An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

scholarly journals Multi-wavelength polarimetry and variability study of the M87 jet

2014 ◽  
Vol 10 (S313) ◽  
pp. 116-121
Author(s):  
Sayali S. Avachat ◽  
Eric S. Perlman ◽  
William B Sparks ◽  
Mihai Cara ◽  
Frazer N. Owen
Keyword(s):  
Magnetic Field ◽  
Angular Resolution ◽  
Polarized Light ◽  
Field Structure ◽  
Data Sets ◽  
Magnetic Field Structure ◽  
Multi Wavelength ◽  
Wavelength Monitoring ◽  
Variability Study ◽  
Better Than

AbstractWe present a high resolution polarimetry and variability study of the M87 jet using VLA and HST data taken during 2002 to 2008. Both data-sets have an angular resolution as high as 0.06”, which is 2-3 times better than previous observations. New morphological details are revealed in both the optical and radio, which can help to reveal the energetic and magnetic field structure of the jet. By comparing the data with previously published HST and VLA observations, we show that the jet's morphology in total and polarized light is changing significantly on timescales of ~1 decade. We compare the evolution of the inner jet (particularly the nucleus and knot HST-1), when our observations overlap with the multi-wavelength monitoring campaigns conducted with HST and Chandra. We use these data to comment on particle acceleration and main emission processes.

scholarly journals Circularly Polarized Photodetectors Based on Chiral Materials: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Can Zhang ◽  
Xiaohong Wang ◽  
Longzhen Qiu
Keyword(s):  
Optical Communication ◽  
Polarized Light ◽  
Research Progress ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Different Types ◽  
Quarter Wave ◽  
Chiral Materials ◽  
Optical Calculation ◽  
Recent Research Progress

Circularly polarized light (CPL) plays an important role in many photonic techniques, including tomographic scanning based on circular polarization ellipsometry, optical communication and information of spin, and quantum-based optical calculation and information processing. To fully exploit the functions of CPL in these fields, integrated photoelectric sensors capable of detecting CPL are essential. Photodetectors based on chiral materials can directly detect CPL due to their intrinsic optical activity, without the need to be coupled with polarizers and quarter-wave plates as in conventional photodetectors. This review summarizes the recent research progress in CPL photodetectors based on chiral materials. We first briefly introduce the CPL photodetectors based on different types of chiral materials and their working principles. Finally, current challenges and future opportunities in the development of CPL photodetectors are prospected.

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