Tunable group delay in a doubly resonant metasurface composed of two dissimilar split-ring resonators

Tamayama, Yasuhiro; Kida, Yutaro

doi:10.1364/josab.36.002694

Cited by 7 publications

(4 citation statements)

References 42 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3(b)]. To minimize γ nr /γ r for a given γ nr , that is, to maximize γ r , the propagation direction of both the incident and transmitted wave should coincide with the direction for which the radiation pattern of the electric dipole induced in the resonator is maximal [35]. Therefore, in the following, we set θ = 45 • .…”

Section: Simulation and Experimentsmentioning

confidence: 99%

Broadband Control of Group Delay Using the Brewster Effect in Metafilms

Tamayama

Yamamoto

2022

Phys. Rev. Applied

Self Cite

View full text Add to dashboard Cite

We propose and verify a method for controlling the frequency dependence of the group delay of electromagnetic waves over a broad frequency range using the Brewster effect in single-layer metamaterials with finite thickness, here referred to as metafilms. When the metafilm's reflectance vanishes regardless of the incident frequency, the group delay can be large near its resonance frequency while maintaining the transmittance close to unity regardless of the incident frequency. Furthermore, when several reflectionless metafilms are stacked together, the total group delay should be given as the sum of the individual group delays. In this study, we realize reflectionless metafilms by arranging the meta-atoms so that the Brewster effect occurs regardless of the incident frequency. We evaluate in numerical simulations and experiments the frequency dependence of the transmittance and of the group delay of a three-layer metamaterial composed of reflectionless metafilms with different resonance frequencies, and find that the total transmittance and group delay of this metamaterial agree respectively with the product of the transmittances and the sum of the group delays of the constituent metafilms.

show abstract

Section: Simulation and Experimentsmentioning

confidence: 99%

Broadband Control of Group Delay Using the Brewster Effect in Metafilms

Tamayama

Yamamoto

2022

Phys. Rev. Applied

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, RISs have attracted extensive attentions in the wireless communication community. [18][19][20][21][22][23] To date, RISs can manipulate the amplitude, [24][25][26][27] phase, [28][29][30][31] polarization, [32][33][34] group delay, [35,36] frequency, [13,15] propagation direction, [37][38][39] and the carried information [34,[40][41][42] of spatial EM waves, with the advantages of low costs and low levels of energy consumption.…”

Section: Introductionmentioning

confidence: 99%

An Optically Transparent Reconfigurable Intelligent Surface with Low Angular Sensitivity

Liang

Gao

Cheng

et al. 2022

Advanced Optical Materials

View full text Add to dashboard Cite

Recently, reconfigurable intelligent surfaces (RISs) have attracted extensive attentions from the communication community due to their powerful wavefront manipulation and signal modulation abilities. Optically transparent RISs are needed in some scenarios requiring both optical transparency and high‐quality communication services. In RIS‐based wireless communications, the channel reciprocity is an important factor to be considered since the electromagnetic responses of RISs usually depend on the incident and receiving angles. To address this problem, an optically transparent 2‐bit RIS with low angular sensitivity is proposed. By applying a transparent dielectric substrate and metal‐mesh‐based patterns, the designed RIS achieves a light transmittance of 49.3%. Both the simulation and measurement results demonstrate the low angular sensitivity at transverse magnetic incidence from 0° to 60°. Moreover, beam steering experiments under various coding sequences and various incident angles are simulated and measured, and the results are consistent with the theoretically predicted results. A further study on the broadcast mode of the RIS shows that its phase response is weakly dependent to the incident and receiving directions.

show abstract

“…Moreover, the effective properties of such a configuration have been studied as well [54]. Furthermore, various asymmetric resonators and supercells consisting of dissimilar SRRs have been investigated under oblique illumination [43,[55][56][57]. Remarkably, a very high Q-factor resonance has been observed under oblique incidence angles that illuminated an array of metalized crosses [58].…”

Section: Introductionmentioning

confidence: 99%

Sensing Glucose Concentration Using Symmetric Metasurfaces under Oblique Incident Terahertz Waves

Al-Naib

2021

Crystals

View full text Add to dashboard Cite

In this article, a planar metamaterial sensor designed at terahertz (THz) frequencies is utilized to sense glucose concentration levels that cover hypoglycemia, normal, and hyperglycemia conditions that vary from 54 to 342 mg/dL. The sensor was developed using a symmetric complementary split rectangular resonator at an oblique incidence angle. The resonance frequency shift was used as a measure of the changes in the glucose level of the samples. The increase in the glucose concentration level exhibited clear and noticeable redshifts in the resonance frequency. For instance, a 67.5 GHz redshift has been observed for a concentration level of 54 mg/dL and increased up to 122 GHz for the 342 mg/dL concentration level. Moreover, a high sensitivity level of 75,700 nm/RIU was observed for this design. In the future, the proposed THz sensors may have potential applications in diagnosing hypocalcemia and hyperglycemia cases.

show abstract

Tunable group delay in a doubly resonant metasurface composed of two dissimilar split-ring resonators

Cited by 7 publications

References 42 publications

Broadband Control of Group Delay Using the Brewster Effect in Metafilms

Broadband Control of Group Delay Using the Brewster Effect in Metafilms

An Optically Transparent Reconfigurable Intelligent Surface with Low Angular Sensitivity

Sensing Glucose Concentration Using Symmetric Metasurfaces under Oblique Incident Terahertz Waves

Contact Info

Product

Resources

About