Tightly focusing terahertz wave using gradient-type slotted grating based on spoof surface plasmons

Wang, Xiaolei; Zhao, Jiehui; Fang, Bo; Jiang, Guangke; Hu, Xiaoxue; Zhu, Zhuqing; Liu, Weiwei

doi:10.1364/oe.390843

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Assuming that the wavelength of the incident wave is much larger than the width of the grating, only the fundamental mode (TEM) of the surface electromagnetic wave mode (EM) supported by this structure exists in the grating structure of region II [26] (region I is outside the grating structure). For the magnetic fields in regions I and II, the following relationship holds:…”

Section: Dispersion Relationshipmentioning

confidence: 99%

Terahertz multi-frequency splitter and spoof SPPs switch

Liu¹,

Wang²,

Hu³

et al. 2021

J. Opt.

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In this paper, a spoof surface plasmon polaritons (SPPs)-based multi-frequency splitter in the terahertz (THz) band is realized by designing different grating heights. The structure is composed of an incident aperture waveguide and a composite gratings structure placed on both sides of the incident aperture waveguide. The composite grating structure has different grating heights, which is used to transmit and guide THz waves of different frequencies in different directions. Simulation results show that a mixed incident light consisting of three frequencies, of 0.5 THz, 0.7 THz and 1 THz, can be effectively separated by this splitter. Furthermore, the function of the spoof SPPs switch can be realized by increasing the number of incident aperture waveguides. The simple structure and small size, means that this multi-frequency splitter and switch can be conveniently integrated into THz sensing or THz communication systems.

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Section: Dispersion Relationshipmentioning

confidence: 99%

Terahertz multi-frequency splitter and spoof SPPs switch

Liu¹,

Wang²,

Hu³

et al. 2021

J. Opt.

Self Cite

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“…11Based on this concept, researchers endow SSPs with immense potentials, one of which is manipulating the propagation of SSPs. A series of novel devices have been corroborated on SSPs manipulation, including plasmonic waveguides, 12,13,14 super focusing of waves, 15,16 and sensing. 17In order to improve the integration and reduce the weight of the system, it is often necessary to introduce multiple functions into a single device.…”

mentioning

confidence: 99%

“…Based on this concept, researchers endow SSPs with immense potentials, one of which is manipulating the propagation of SSPs. A series of novel devices have been corroborated on SSPs manipulation, including plasmonic waveguides, 12,13,14 super focusing of waves, 15,16 and sensing. 17…”

mentioning

confidence: 99%

Bifunctional Luneburg–fish-eye lens based on the manipulation of spoof surface plasmons

et al. 2021

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Manipulation of spoof surface plasmons (SSPs) has recently intrigued enormous interest due to the capability of guiding waves with subwavelength footsteps. However, most of the previous studies, manifested for a single functionality, are not suitable for multifunctional integrated devices. Herein, a bifunctional Luneburg-fisheye lens is proposed based on a two-dimension metal pillar array. Firstly, by tuning the geometric dimension of the metal pillars in the array, its ability to precisely manipulate the excited SSPs along one direction is confirmed, achieving subwavelength focusing and imaging with the resolution up to 0.14λ. Then, separately controlling the propagation of the SSPs along the orthotropic directions is further implemented, and the bifunctional Luneburg-fisheye lens is realized. The bifunctional lens is characterized as a Luneburg one along the x-axis, whereas in the y-axis, it presents the properties of a Maxwell fisheye lens. The experimental results almost immaculately match with the simulation ones. This bifunctional lens can validly reduce the system complexity and exert flexibility in multifunctional applications, while the proposed metal pillar-based design method broadens the application range of gradient refractive-index lens in the microwaves, terahertz, and even optical ranges.Surface plasmon polaritons (SPPs) are produced by collective oscillations of electron gases near metallic surfaces and interfaces, which behave as surface waves in the optical regime. 1 The SPPs propagate along the interface between the metal and dielectric, simultaneously, decay exponentially along the direction perpendicular to the interface. 2 They have inherent features such as strong confinement and near-field enhancement effect. Attributing to the intriguing properties of SPPs, they have been applied to a wealth of designs including miniaturized photonic circuits, 3 super-resolution imaging, 4,5 high-sensitive sensors, 6,7 and detection. 8,9 From the perspective of terahertz and microwave frequencies, however, the metals behave like the perfect electric conductor, along which the natural SPPs are severely weakened. 10 To achieve the analogous performance in microwave and terahertz regions, Pendry et.al. constructed the periodic hole array on a metal surface to mimic the optical SPPs properties, which are called spoof surface plasmons (SSPs). 11Based on this concept, researchers endow SSPs with immense potentials, one of which is manipulating the propagation of SSPs. A series of novel devices have been corroborated on SSPs manipulation, including plasmonic waveguides, 12,13,14 super focusing of waves, 15,16 and sensing. 17In order to improve the integration and reduce the weight of the system, it is often necessary to introduce multiple functions into a single device. However, the aforementioned researches are less concerned about multifunctional devices, which are urgently required for multipurpose applications. Encouragingly, recent researches gradually pay more attention to this issue and propose diverse m...

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