Ultrafast and Low-Threshold THz Mode Switching of Two-Dimensional Nonlinear Metamaterials

Kang, Bong Joo; Rohrbach, David; Brunner, F.; Bagiante, S.; Sigg, H.; Feurer, Thomas

doi:10.1021/acs.nanolett.1c04776

Cited by 13 publications

(5 citation statements)

References 51 publications

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“…It also supports that the experimentally extracted nonlinear susceptibilities of Si at different levels of nonperturbation are accurate and sound, which was very difficult to obtain. We speculate that through further reduction of the duty factor, 22,31 the THG intensity could be further improved until reaching the saturation and damage threshold. As mentioned above, the primary factors contributing to the differences between simulated and measured amplitudes of the THG are the nonuniform distributions of the local field and dopants, along with inevitable fabrication errors.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…It also results in another critical issue that the perturbative and nonperturbative THz nonlinear characters of most materials, including Si, are absent, which are apparently essential in understanding the nonlinear behaviors of mattes and developing high-performance THz sources. On the other hand, metamaterials have offered an attractive platform for various nonlinear effects, owing to their ability to efficiently confine light down to a subwavelength scale and enhance the local field. − By introducing metamaterials, it is possible to stimulate the nonperturbative responses of Si and generate highly efficient THz THG under the excitation of a moderate pump at room temperature. As a cornerstone of the semiconductor industry, Si-based metamaterial would be a very promising candidate for high-performance, on-chip THz harmonic sources and nonlinear devices.…”

Section: Introductionmentioning

confidence: 99%

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Nonperturbative Nonlinear Metasurfaces for Efficient Terahertz Harmonic Generation

Wang,

Tan,

Wen

et al. 2024

ACS Photonics

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The nonlinearities at terahertz (THz) frequencies have been recognized as key and promising approaches to advance the development of high-frequency THz sources via the harmonic generation process, which lies at the core of THz technology. However, the high-performance nonlinear THz materials possessing extreme conversion efficiency, high-volume on-chip integration, and room-temperature operation are still seemingly missing. Here, we propose a nonlinear metasurface for efficient THz third-harmonic generation (THG) based on the nonperturbative nonlinearity of doped silicon. By integrating aluminum grating, the significantly enhanced local field drives the intrinsic nonlinearity of silicon to the nonperturbation regime, where the conversion efficiency of THz THG approaching maximum can be achieved under moderate pump from table-top sources at ambient temperature. The measurements demonstrate that the nonlinear responses of metasurfaces are ∼1000 times stronger than the plain silicon film. Such a platform also allows us to experimentally obtain the nonlinear susceptibilities of silicon at perturbation and nonperturbation regimes, which are crucial for understanding the essences of nonlinear THz–matter interactions but scarcely available for most materials in this part of the spectrum. Our findings may open an avenue toward CMOS-compatible, room-temperature, and efficient THz sources and nonlinear electronics.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Nonperturbative Nonlinear Metasurfaces for Efficient Terahertz Harmonic Generation

Wang,

Tan,

Wen

et al. 2024

ACS Photonics

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“…Actually, the SRR structure has been widely used in micro- and nano-optics fields. It has not only been used as an efficient absorber [ 21 , 22 ], which can accurately control the absorption process of light [ 23 ], but also has played an important role as a filter [ 24 , 25 , 26 ] to effectively screen out light waves at specific frequencies. Lahiri et al investigated an asymmetric SRR and obtained a 0.51 µm and 0.12 µm spectral shift for a 100 nm and 30 nm thick PMMA layer [ 27 ], respectively.…”

Section: Introductionmentioning

confidence: 99%

The Strong Coupling Effect between Metallic Split-Ring Resonators and Molecular Vibrations in Polymethyl Methacrylate

Liu,

Maqbool,

Han

2024

Sensors

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We propose and study a nanoscale strong coupling effect between metamaterials and polymer molecular vibrations using metallic split-ring resonators (SRRs). Specifically, we first provided a numerical investigation of the SRR design, which was followed by an experimental demonstration of strong coupling between mid-infrared magnetic dipole resonance supported by the SRRs fabricated on a calcium fluoride substrate and polymethyl methacrylate molecular vibrations at 1730 cm−1. Characterized by the anti-crossing feature and spectral splitting behaviors in the transmission spectra, these results demonstrate efficient nanoscale manipulation of light–matter interactions between phonon vibrations and metamaterials.

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“…For example, the concept of the optical bound state in the continuum (BIC) was introduced into the design of a structured metal element surface to enhance the light-matter interaction in nano-optics and quantum photonics, thus enhancing the resonance field in plasmonic metasurfaces [ 19 ]. By judiciously designing two-dimensional THz metamaterials consisting of a resonant metallic structure embedded in the dielectric environment, the electromagnetic field of the incident THz pulse was enhanced to have values sufficiently high to cause nonlinear responses of the environment [ 20 ]. A reconfigurable hybrid metasurface platform was proposed by incorporating the phase-change material Ge2Sb2Te5 (GST) into metal-dielectric meta-atoms for active and nonvolatile tuning of properties of light [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Shielding Performance of Electromagnetic Shielding Fabric Implanted with “Split-Ring Resonator”

2023

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The electromagnetic shielding (EMS) fabric is an important electromagnetic protection product, which is widely applied in various fields. The improvement of its shielding effectiveness (SE) has always been the focus of research. This article proposes to implant a metamaterial structure of a “split-ring resonator (SRR)” in the EMS fabrics, so that the fabric not only maintains the porous and lightweight characteristics, but also obtains the SE improvement. With the help of the invisible embroidery technology, stainless-steel filaments were used to implant hexagonal SRRs inside the fabric. The effectiveness and influencing factors of the SRR implantation were described by testing the SE of the fabric and analyzing the experimental results. It was concluded that the SRR implantation inside the fabric can effectively improve the SE of the fabric. For the stainless-steel EMS fabric, the increase amplitude of the SE reached between 6 dB and 15 dB in most frequency bands. The overall SE of the fabric showed a decrease trend with the reduction of the outer diameter of the SRR. The decrease trend was sometimes fast and sometimes slow. The decreasing amplitudes were different in various frequency ranges. The number of embroidery threads had a certain effect on the SE of the fabric. When other parameters remained unchanged, the increase of the diameter of the embroidery thread resulted in the increase of the SE of the fabric. However, the overall improvement was not significant. Finally, this article also points out that other influencing factors of the SRR need to be explored, and the failure phenomenon may occur under certain situations. The proposed method has the advantages of the simple process, convenient design, no pore formation, SE improvement retaining the original porous characteristics of the fabric. This paper provides a new idea for the design, production, and development of new EMS fabrics.

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Ultrafast and Low-Threshold THz Mode Switching of Two-Dimensional Nonlinear Metamaterials

Cited by 13 publications

References 51 publications

Nonperturbative Nonlinear Metasurfaces for Efficient Terahertz Harmonic Generation

Nonperturbative Nonlinear Metasurfaces for Efficient Terahertz Harmonic Generation

The Strong Coupling Effect between Metallic Split-Ring Resonators and Molecular Vibrations in Polymethyl Methacrylate

Shielding Performance of Electromagnetic Shielding Fabric Implanted with “Split-Ring Resonator”

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