A four-state programmable mid-infrared band-stop filter exploiting a Ge2Sb2Te5 film and VO2 nanoparticles

Yun Meng; Dan Li; Chong Zhang; Yang Wang; Robert E. Simpson; Yi Long

doi:10.1063/5.0058384

High-Efficiency Spin-Related Vortex Metalenses

Nanomaterials ◽

10.3390/nano11061485 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1485

Author(s):

Wei Wang ◽

Ruikang Zhao ◽

Shilong Chang ◽

Jing Li ◽

Yan Shi ◽

...

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Topological Charge ◽

High Efficiency ◽

Infrared Band ◽

Mid Infrared ◽

Integrated Devices ◽

Vortex Beams ◽

Topological Charges

In this paper, one spin-selected vortex metalens composed of silicon nanobricks is designed and numerically investigated at the mid-infrared band, which can produce vortex beams with different topological charges and achieve different spin lights simultaneously. Another type of spin-independent vortex metalens is also designed, which can focus the vortex beams with the same topological charge at the same position for different spin lights, respectively. Both of the two vortex metalenses can achieve high-efficiency focusing for different spin lights. In addition, the spin-to-orbital angular momentum conversion through the vortex metalens is also discussed in detail. Our work facilitates the establishment of high-efficiency spin-related integrated devices, which is significant for the development of vortex optics and spin optics.

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Study on a calculation model of infrared radiation characteristics of rocket engine plume

Journal of Physics Conference Series ◽

10.1088/1742-6596/2125/1/012006 ◽

2021 ◽

Vol 2125 (1) ◽

pp. 012006

Author(s):

Nan Wu ◽

Chengpo Mu ◽

Yang He ◽

Huan Liu ◽

Taiye Liu

Keyword(s):

Flow Field ◽

Infrared Radiation ◽

Rocket Engine ◽

Calculation Model ◽

Characteristic Parameters ◽

Infrared Band ◽

Radiation Characteristics ◽

Mid Infrared ◽

Fast Calculation ◽

Plume Flow

Abstract In order to study the infrared radiation (IR) characteristics of rocket engine plume in the mid infrared band, a calculation model for IR transfer of rocket engine plume was built. The flow field data are calculated by software FLUENT. Based on HITRAN database, the IR characteristic parameters are calculated after spectral line correction. The Line of Sight (LoS) is used to solve the radiation characteristics in the plume flow field, and the IR characteristics distribution of the plume in the mid infrared band is obtained, which agree well with the results from open literature. The method has the advantages of simple model, less parameters and fast calculation speed in this paper.

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Wide-Range Tunable Narrow Band-Stop Filter Based on Bilayer Graphene in the Mid-Infrared Region

IEEE Photonics Journal ◽

10.1109/jphot.2020.3004005 ◽

2020 ◽

Vol 12 (4) ◽

pp. 1-9

Author(s):

Yindi Wang ◽

Hongxia Liu ◽

Shulong Wang ◽

Ming Cai

Keyword(s):

Narrow Band ◽

Infrared Region ◽

Bilayer Graphene ◽

Mid Infrared ◽

Wide Range ◽

Band Stop Filter

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Optical Transport Properties of Graphene Surface Plasmon Polaritons in Mid-Infrared Band

Crystals ◽

10.3390/cryst9070354 ◽

2019 ◽

Vol 9 (7) ◽

pp. 354 ◽

Cited By ~ 9

Author(s):

Yindi Wang ◽

Hongxia Liu ◽

Shulong Wang ◽

Ming Cai ◽

Lan Ma

Keyword(s):

Surface Plasmon ◽

Surface Plasmon Polaritons ◽

Infrared Region ◽

Transmission Characteristics ◽

Infrared Band ◽

Theoretical Derivation ◽

Mid Infrared ◽

Graphene Surface ◽

Silicon Based ◽

Plasmon Polaritons

The excellent transmission characteristics of graphene surface plasmon polaritons in mid-infrared band were analyzed and verified effectively through theoretical derivation and soft simulation in this paper. Meanwhile, a sandwich waveguide structure of dielectric–graphene–substrate–dielectric based on graphene surface plasmon polaritons (SPPs) was presented. Simulation results indicate that graphene SPPs show unique properties in the mid-infrared region including ultra-compact mode confinement and dynamic tunability, which allow these SPPs to overcome the defects of metal SPPs and traditional silicon-based optoelectronic devices. Thus, they can be used to manufacture subwavelength devices. The work in this paper lays a theoretical foundation for the application of graphene SPPs in the mid-infrared region.

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A New Electro-Optical Switch Modulator Based on the Surface Plasmon Polaritons of Graphene in Mid-Infrared Band

Sensors ◽

10.3390/s19010089 ◽

2018 ◽

Vol 19 (1) ◽

pp. 89 ◽

Cited By ~ 4

Author(s):

Ming Cai ◽

Shulong Wang ◽

Bo Gao ◽

Yindi Wang ◽

Tao Han ◽

...

Keyword(s):

Energy Loss ◽

Surface Plasmon ◽

Surface Plasmon Polaritons ◽

Surface Plasmon Polariton ◽

Modulation Depth ◽

Optical Switch ◽

Dielectric Structure ◽

Infrared Band ◽

Mid Infrared ◽

Plasmon Polaritons

In this paper, a new electro-optical switch modulator based on the surface plasmon polaritons of graphene is proposed. An air–graphene-substrate–dielectric structure is adopted in the modulator. In this structure, the graphene is considered as a film of metal whose thickness tends to be infinitesimal. By changing the external voltage, the boundary conditions can be changed to decide whether the surface plasmon polariton waves can be excited in mid-infrared band. Because of this effect, the structure can be used as an electro–optical switch modulator, whose modulation depth is about 100% in theory. Finally, the 3 dB bandwidth (~34 GHz) and the energy loss (36.47 fJ/bit) of the electro–optical switch modulator are given, whose low energy loss is very suitable for engineering applications.

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