Broadband and polarization-mediated unidirectional plasmon polaritons launch based on metallic triangle aperture arrays

2020 ◽  
pp. 2150006
Author(s):  
Cong Chen ◽  
Jianxin Xi ◽  
Panpan Chen ◽  
Wanxia Huang ◽  
Kuanguo Li ◽  
...  
Keyword(s):  
Extinction Ratio ◽  
Polarized Light ◽  
Incident Beam ◽  
Unidirectional Transmission ◽  
Linearly Polarized ◽  
The Right ◽  
Aperture Arrays ◽  
Difference Time ◽  
Plasmon Polaritons ◽  
Wide Operating

The application of the subwavelength planar structure to control the propagation direction of surface plasmon polaritons (SPPs) has attracted many interests in recent years. However, the traditional unidirectional transmission devices of SPPs are limited by the low extinction ratio, narrow working band and the incapability of controlling the transmission directions. In this study, a novel SPPs unidirectional transmission device based on metallic aperture arrays of the right triangle (RT) is proposed and demonstrated by numerical simulations (finite-difference time-domain method). The maximum extinction ratio of the unidirectional transmission device can reach upto 33 dB under the irradiation of linearly polarized light, and the device possesses a wide operating band ([Formula: see text] nm) while the extinction ratio is greater than 10 dB. Moreover, the transmission direction of SPPs can be flexibly controlled by tuning the polarization of the incident beam. This broadband, polarization-mediated and high extinction ratio unidirectional transmission device shows great potential in the compact plasmonic devices.

scholarly journals Metasurface of Combined Semicircular Rings with Orthogonal Slit Pairs for Generation of Dual Vector Beams

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1718
Author(s):  
Qian Kong ◽  
Manna Gu ◽  
Xiangyu Zeng ◽  
Rui Sun ◽  
Yuqin Zhang ◽  
...  
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Polarized Light ◽  
Orientation Angle ◽  
Fdtd Simulation ◽  
Dual Vector ◽  
Vector Beams ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Difference Time

Manipulation of multichannel vector beams (VBs) with metasurfaces is an important topic and holds potential applications in information technology. In this paper, we propose a novel metasurface for the generation of dual VBs, which is composed of orthogonal slit pairs arranged on multiple groups of combined semicircular rings (CSRs). A group of CSRs include a right-shifted set and a left-shifted set of semicircular rings, and each set of semicircular rings has two halves of circles with different radii, sharing the same shifted center. Under the illumination of linearly polarized light, the two shifted sets of semicircular rings generate the two VBs at the shifted center positions on the observation plane. The slit units of each set are designed with independent rotation order and initial orientation angle. By adjusting the linear polarization of illumination, both two VBs with their orders and polarization states are independently controlled simultaneously. The principle and design are demonstrated by the finite-difference time domain (FDTD) simulation. The work is of significance for miniatured devices of VB generators and for related applications.

scholarly journals Design of Metasurface with Nanoslits on Elliptical Curves for Generation of Dual-Channel Vector Beams

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3024
Author(s):  
Xiaorong Ren ◽  
Manna Gu ◽  
Xiangyu Zeng ◽  
Rui Sun ◽  
Yuqin Zhang ◽  
...  
Keyword(s):  
Focal Point ◽  
Polarized Light ◽  
Spin Component ◽  
Destructive Interference ◽  
Constructive Interference ◽  
Dual Channel ◽  
Vector Beams ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Difference Time

The manipulations of nanoscale multi-channel vector beams (VBs) by metasurfaces hold potential applications in various important fields. In this paper, the metasurface with two sets of nanoslits arranged on elliptic curves was proposed to generate the dual-channel focused vector beams (FVBs). Each set of nanoslits was composed of the in-phase and the out-of-phase groups of nanoslits to introduce the constructive interference and destructive interference of the output light field of the nanoslits, focusing the converted spin component and eliminating the incident spin component at the focal point. The two sets of nanoslits for the channels at the two focal points were interleaved on the same ellipses, and by setting their parameters independently, the FVBs in the two channels are generated under illumination of linearly polarized light, while their orders and polarization states of FVBs were controlled independently. The generation of the FVBs with the designed metasurfaces was demonstrated by the finite-difference time domain (FDTD) simulations and by the experimental verifications. The work in this paper is of great significance for the generation of miniaturized multi-channel VBs and for broadening the applications of metasurfaces.

scholarly journals Об эффекте Гуса-Хенхена при наличии возбуждения поверхностных волн в схеме Кречмана

2019 ◽  
Vol 127 (10) ◽  
pp. 654
Author(s):  
А.Б. Петрин
Keyword(s):  
Light Beam ◽  
Layered Structure ◽  
Polarized Light ◽  
Incident Beam ◽  
Polarization Vector ◽  
Theoretical Method ◽  
Polarized Beam ◽  
Linearly Polarized ◽  
Finite Aperture ◽  
Plane Light

AbstractA theoretical method for investigating reflection of a finite-aperture plane light beam from a flat-layered structure in the Kretschmann scheme is considered. The developed theory is applied for investigating the Goos–Hänchen effect, which arises upon incidence of a linearly polarized light beam with the polarization vector lying in the plane of incidence ( p -polarized beam) and which is that, upon reflection, the incident beam is divided into two close beams of the same polarization. The accuracy of sensors based on this effect is discussed.

scholarly journals Broadband Spin-Dependent Directional Coupler via Single Optimized Metallic Catenary Antenna

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 326
Author(s):  
Cong Chen ◽  
Jiajia Mi ◽  
Panpan Chen ◽  
Xiang Du ◽  
Jianxin Xi ◽  
...  
Keyword(s):  
Directional Coupler ◽  
Rapid Development ◽  
Incident Light ◽  
Extinction Ratio ◽  
Polarized Light ◽  
Optical Devices ◽  
Integrated Optical ◽  
Integrated Optical Devices ◽  
Unidirectional Transmission ◽  
On Chip

With the rapid development of on-chip optics, integrated optical devices with better performance are desirable. Waveguide couplers are the typical integrated optical devices, allowing for the fast transmission and conversion of optical signals in a broad working band. However, traditional waveguide couplers are limited by the narrow operation band to couple the spatial light into the chip and the fixed unidirectional transmission of light flow. Furthermore, most of the couplers only realize unidirectional transmission under the illumination of the linear polarized light. In this work, a broadband polarization directional coupler based on a metallic catenary antenna integrated on a silicon-on-insulator (SOI) waveguide has been designed and demonstrated under the illumination of the circularly polarized light. By applying the genetic algorithm to optimize the multiple widths of the metallic catenary antenna, the numerical simulation results show that the extinction ratio of the coupler can be maintained larger than 18 dB in a wide operation band of 300 nm (from 1400 to 1700 nm). Moreover, the coupler can couple the spatial beam into the plane and transmit in the opposite direction by modulating the rotation direction of the incident light. The broadband polarization directional coupler might have great potential in integrated optoelectronic devices and on-chip optical devices.

Efek Circular Dichroism pada Metamaterial Chiral Planar

2018 ◽  
Vol 2 (2) ◽  
pp. 49-52
Author(s):  
Juliasih Partini
Keyword(s):  
Circular Dichroism ◽  
Laser Light ◽  
Polarized Light ◽  
Polarization Plane ◽  
Sample Surface ◽  
Opposite Polarity ◽  
Linearly Polarized ◽  
The Right ◽  
Circular Dichroïsm ◽  
Chiral Metamaterial

Abstrak – Penelitian ini mengkaji efek circular dichroism pada metamaterial chiral planar. Bidang polarisasi akan terotasi ketika cahaya yang terpolarisasi linear melewati metamaterial chiral planar. Pada efek circular dichroism, cahaya yang terpolarisasi circular putaran kanan dan putaran kiri akan mempunyai perbedaan absorpsi dalam interaksinya dengan partikel penyusun metamaterial chiral planar. Spektrum eliptisitas metamaterial chiral planar menunjukkan eliptisitas bahan yang bernilai positif untuk sampel putar kanan dan bernilai negatif untuk sampel putar kiri. Nilai eliptisitas diperoleh sebesar maksimal +0,3 dan -0,3 terjadi pada frekuensi 1,29 THz. Eliptisitas maksimum menunjukkan adanya kopling antara foton dengan plasmon permukaan sampel. Polaritas yang berlawanan menunjukkan perbedaan absorbansi antara sampel putar kanan dan sampel putar kiri. Hasil tersebut juga menunjukkan adanya perubahan polarisasi linear pada laser femtosekon menjadi polarisasi eliptik pada  gelombang THz hasil emisi sampel metamaterial chiral planar. Kemampuan metamaterial chiral planar dalam memutar bidang polarisasi dan merubah menjadi polarisasi circular menjadikan bahan ini layak dijadikan alternatif polarisator dalam ranah terahertz.  Kata kunci: metamaterial, circular dichroism, chirality, polarisasi, eliptisitasAbstract – This paper describes the circular dichroism effect on planar chiral metamaterial. When a linearly polarized light passes through the planar chiral metamaterial, its polarization plane will rotate. On the circular dichroism effect, the right and left circulary polarized light will have different absorption due to its interaction with a planar chiral metamaterial. The ellipticity spectrum of a planar chiral metamaterial sample shows a positive ellipticity value for the counter clock-wise sample and a negative value for the clock-wise sample. The maximum ellipticity value is determine as +0,3 and -0,3 at frequency of 1,29 THz. The values show the existence of a coupling between photon and the sample surface plasmon. The opposite polarity indicates that the clock-wise and the counter clock-wise sample have different absorbance. The determined ellipticity value also reveals that the linearly polarized femtosecond laser light has transformed to elliptical polarized THz wave on a planar chiral metamaterial sample emission. The planar chiral metamaterial capability to rotate the polarization plane into circulary polarized wave, makes the material can be considered as an alternative polarizer in terahertz field.  Key words: metamaterial, circular dichroism, chirality, polarization, ellipticity

Efficient planar plasmonic directional launching of linearly polarized light in a catenary metasurface

2020 ◽  
Vol 22 (47) ◽  
pp. 27554-27559
Author(s):  
Panpan Chen ◽  
Cong Chen ◽  
Saisai Qin ◽  
Jianxin Xi ◽  
Wanxia Huang ◽  
...  
Keyword(s):  
Extinction Ratio ◽  
Polarized Light ◽  
Normal Incidence ◽  
Linearly Polarized

Under the normal incidence of p-polarized light at 750 nm, the numerical extinction ratio reached up to 35 dB and the measured extinction ratio reached up to 24 dB.

scholarly journals Compact Photonic Crystal Polarization Beam Splitter Based on the Self-Collimation Effect

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 198
Author(s):  
Geyu Tang ◽  
Huamao Huang ◽  
Yuqi Liu ◽  
Hong Wang
Keyword(s):  
Optical Communications ◽  
Beam Splitter ◽  
Extinction Ratio ◽  
Polarized Light ◽  
The Self ◽  
Polarization Beam Splitter ◽  
Optical Interconnection ◽  
Beam Splitting ◽  
Beam Splitters ◽  
Polarization Extinction Ratio

We propose a new compact polarization beam splitter based on the self-collimation effect of two-dimensional photonic crystals and photonic bandgap characteristics. The device is composed of a rectangular air holes-based polarization beam splitting structure and circular air holes-based self-collimating structure. By inserting the polarization beam splitting structure into the self-collimating structure, the TE and TM polarized lights are orthogonally separated at their junction. When the number of rows in the hypotenuse of the inserted rectangular holes is 5, the transmittance of TE polarized light at 1550 nm is 95.4% and the corresponding polarization extinction ratio is 23 dB; on the other hand, the transmittance of TM polarized light is 88.5% and the corresponding polarization extinction ratio is 37 dB. For TE and TM polarized lights covering a 100 nm bandwidth, the TE and TM polarization extinction ratios are higher than 18 dB and 30 dB, respectively. Compared with the previous polarization beam splitters, our structure is simple, the size is small, and the extinction ratio is high, which meets the needs of modern optical communications, optical interconnection, and optical integrated systems.

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