Flexible and tunable terahertz all-dielectric metasurface composed of ceramic spheres embedded in ferroelectric/ elastomer composite

Lan, Chuwen; Zhu, Di; Gao, Jinwu; Li, Bo; Gao, Zehua

doi:10.1364/oe.26.011633

Cited by 16 publications

(8 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[153][154][155][156][157][158][159][160][161][162] To obtain higher modulation efficiency with stronger nonlinearity, the resonant behavior can be used to enhance the interaction between materials and electromagnetic waves by narrowing the interaction bandwidth. In this section, we discuss THz metamaterials based on three different types of ferroelectric materials: strontium titanate (SrTiO 3 , STO), [163][164][165][166][167][168][169][170][171][172][173][174] barium strontium titanate (BaSrTiO 3 -mostly Ba 0.6 Sr 0.4 TiO 3 , BST), [175][176][177][178] and potassium tantalite (KTaO 3 , KTO). [179][180][181]…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Jeong

Bahk

Kim

2019

Advanced Optical Materials

View full text Add to dashboard Cite

Phase‐change phenomena have been an attractive research theme for decades due to the dynamic transition of material properties providing extraordinary capabilities for versatile optical device applications. Even at the terahertz (THz) frequency regime, phase‐change materials (PCMs) promote the development of dynamic devices, especially when combined with a plasmonic approach delivering strong field enhancement and localization. According to the design of plasmonic metamaterials or hybrid composites, PCMs can actively modulate the electromagnetic properties of THz waves through thermal, electrical, and optical means. In turn, THz waves can affect the PCM properties in the nonlinear regime due to the intense field strength enhancement by plasmonic structures. Here, a few types of PCMs demonstrating promising potential in THz plasmonic applications are introduced. Starting from the best‐known transition metal oxide, vanadium dioxide (VO2), which possesses an insulator‐to‐metal phase transition near room temperature, superconductors, chalcogenides, ferroelectrics, liquid crystals, and liquid metals are covered along with their phase‐change properties and the control mechanisms infused with THz plasmonic applications. The corresponding recent progress presenting how PCMs combined with plasmonic structures can demonstrate effective THz modulation is reviewed. This general overview may provide a better understanding of dynamic THz plasmonics and new ideas for future THz technology.

show abstract

Section: Wwwadvopticalmatdementioning

confidence: 99%

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Jeong

Bahk

Kim

2019

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…Such materials can be engineered in an array configuration to modulate the transmission and reflection amplitude, phase or polarization of an incident terahertz wave, or actively switch resonant frequency. In this category, moderately doped silicon, compound III–V semiconductors, 2D materials and van der Waal heterostructures, III–V semiconductor and carbon nanotubes and nanowires, and oxide nanospheres have been demonstrated to exhibit active response in the terahertz regime.…”

Section: Lossless Dielectric Materialsmentioning

confidence: 99%

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Ako

Upadhyay

Withayachumnankul

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

on distinctive spectral signatures resulting from vibrational modes of covalent and hydrogen bonds. [8,[13][14][15][16] The focus on this spectrally rich region is attributed to the highly coherent and nonionizing nature of terahertz radiation, wide unallocated frequency bands, distinctive wavelengths, and their penetration through a significant depth of dielectric materials. Terahertz technology is geared toward realizing devices that can efficiently manipulate the phase, amplitude, and polarization of terahertz radiations for the above-mentioned myriad of applications.However, progress in this domain is held back by low terahertz power available from compact sources, high free-space path loss, and limited choice of materials that exhibit less absorption of terahertz waves. [17] Owing to the fact that natural materials demonstrate weak wave-matter interaction at terahertz frequencies, terahertz devices with engineered subwavelength resonant metallic inclusions on dielectric spacers have been realized, to interact strongly with an incident electromagnetic wave.In the past, metamaterials have been a promising route to building terahertz devices. These devices have in essence been engineered as 3D resonating elements that effectively manipulate both permittivity and permeability of an effective medium to couple to free space. The underlining disadvantage of these structures is the difficulty involved in the fabrication of 3D geometrical structures using standard semiconductor fabrication techniques. Standard fabrication techniques are generally amenable to 2D design with extrusion of these structures into thickness (the third, vertical dimension). Moreover, the choice and availability of dielectric materials and metals that provide sufficient interaction while retaining device efficiency has proved challenging. [13,[18][19][20] Recently, effective manipulation of electromagnetic wave has been widely demonstrated with 2D metasurfaces, which were originally employed as building blocks for 3D metamaterials. In these lower-dimension designs, effective manipulation of terahertz waves for various applications is achieved by carefully designing sub-wavelength resonant structures as is evident in published review articles. [21,22] Metasurfaces present high degree of compactness that enhances radiation efficiency. Additionally, the planar form factor of metasurfaces enables Manipulation of terahertz radiation opens new opportunities that underpin application areas in communication, security, material sensing, and characterization. Metasurfaces employed for terahertz manipulation of phase, amplitude, or polarization of terahertz waves have limitations in radiation efficiency which is attributed to losses in the materials constituting the devices. Metallic resonators-based terahertz devices suffer from high ohmic losses, while dielectric substrates and spacers with high relative permittivity and loss tangent also reduce bandwidth and efficiency. To overcome these issues, a proper choice of low loss and low relative permittivi...

show abstract

“…Hence, tunable metasurfaces provide a versatile platform for the dynamic manipulation of electromagnetic waves. 29−32 Various developments have been made using lumped elements (e.g., varactors and PIN diodes), 33−35 actively controlled materials (e.g., graphene, 36−39 ferroelectric materials, 40 liquid crystals, 41−45 and phase change materials 46−49 ), and mechanically tunable metasurfaces. 50−52 To date, most of the reported tunable metasurfaces regulate the reflection, scattering, and absorption of electromagnetic waves.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of metasurfaces include absorbers, − antennas, − polarization converters, , beam shapers, − holographic imaging, − and other interesting applications. − These conventional metasurfaces are mostly static; in other words, their electrical, magnetic, and magnetoelectric responses are fixed by design, and once manufactured, their functions cannot be tuned to meet the requirements of increasingly complex applications. Hence, tunable metasurfaces provide a versatile platform for the dynamic manipulation of electromagnetic waves. − Various developments have been made using lumped elements (e.g., varactors and PIN diodes), − actively controlled materials (e.g., graphene, − ferroelectric materials, liquid crystals, − and phase change materials − ), and mechanically tunable metasurfaces. − …”

Section: Introductionmentioning

confidence: 99%

Metasurface with Electrically Tunable Microwave Transmission Amplitude and Broadband High Optical Transparency

Xia

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Metasurfaces with tunable microwave transmission amplitude and broadband high optical transparency hold great promise for the next generation of optically transparent and smart electromagnetic transmission devices. In this study, a novel and electrically tunable metasurface with high optical transparency in the visible-infrared broadband is proposed and fabricated by integrating meshed electric-LC resonators and patterned VO 2 . Simulations and experiments demonstrate that the designed metasurface has a normalized transmittance greater than 88% over a wide wavelength range of 380−5000 nm, and the transmission amplitude can be continuously tuned from −1.27 to −15.38 dB at 10 GHz under current excitation, indicating significantly limited passband loss and strong electromagnetic shielding capability in the on and off cases, respectively. This study provides a simple, practical, and feasible method for optically transparent metasurfaces with electrically tunable microwave amplitude, paving the way for the application of VO 2 in multiple fields such as intelligent optical windows, smart radomes, microwave communications, and optically transparent electromagnetic stealth.

show abstract

Flexible and tunable terahertz all-dielectric metasurface composed of ceramic spheres embedded in ferroelectric/ elastomer composite

Cited by 16 publications

References 20 publications

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Dielectrics for Terahertz Metasurfaces: Material Selection and Fabrication Techniques

Metasurface with Electrically Tunable Microwave Transmission Amplitude and Broadband High Optical Transparency

Contact Info

Product

Resources

About