A novel graphene metamaterial design for tunable terahertz plasmon induced transparency by two bright mode coupling

Zhang, Huiyun; Cao, Yanyan; Liu, Yuanzhong; Li, Yue; Zhang, Yuping

doi:10.1016/j.optcom.2017.01.008

Cited by 81 publications

(26 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…33 PIT has been realized by either the destructive interference of dark-bright modes 11 or detuning of the two bright modes. 34 Hybrid metamaterial based devices can generate a tunable PIT response that can be used for enhanced sensing and switchable camouflage systems. 29,[35][36][37] These devices operate in the transmission mode and require a transparent substrate that limits the design wavelengths based on the type of substrate being used.…”

mentioning

confidence: 99%

“…29,[35][36][37] These devices operate in the transmission mode and require a transparent substrate that limits the design wavelengths based on the type of substrate being used. [11][12][13]34 On the other hand, the light matter interaction of graphene on top of the reflecting surface is increased fourfold. 38 This enhanced local electric field on a reflecting surface in the presence of graphene can be used for better detection and modulation.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Habib

Gokbayrak

Özbay

et al. 2018

Applied Physics Letters

View full text Add to dashboard Cite

The tunable plasmon induced reflectance (PIR) effect has been numerically investigated and experimentally realized by hybrid metal-graphene metamaterials. The PIR effect is produced by two parallel strips of gold (Au) and controlled electrically by applying the gate voltage to the graphene layer. The PIR response is generated by the weak hybridization of two bright modes of the gold strips and tuned by changing the Fermi level (Ef) of the graphene. The total shift of 211.7 nm was achieved in the reflection peak by applying only 3 V. This concept of real time electrical tuning of PIR, with a modulation depth of ∼49% and a spectral contrast ratio of 66.6%, can be used for designing optical switches, optical modulators, and tunable sensors.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Habib

Gokbayrak

Özbay

et al. 2018

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…In the bright-bright or bright-dark mode system, variation in the relative distance between the resonators could modify the coupling of the bright-dark modes or the bright-bright modes [31,32]. The second approach is usually to construct hybrid metamaterials through integrating with the active medium, and the resonance strength of the EIT can be modulated via manipulating the conductivity of the active medium [29,[33][34][35]. However, very limited attempts have been made to manipulate the EIT effect without either varying the relative distance between the resonators or utilizing the active medium.…”

Section: Introductionmentioning

confidence: 99%

Enhanced THz EIT resonance based on the coupled electric field dropping effect within the undulated meta-surface

et al. 2019

View full text Add to dashboard Cite

In this paper, the enhanced terahertz (THz) electromagnetically induced transparency (EIT) resonance is achieved based on the coupled electric field dropping effect within the undulated meta-surface. It is found that the height difference between the inner ring and the outer split ring could lead to a significant coupled mode with electric field dropping distribution. When the height of the inner ring increases, the electric field of the inner ring gradually cascades to the outer ring just as a waterfall so that the coupling between the two rings in a unit cell and two adjacent units is enhanced. Both the simulation and experimental results show that a nearly 95% transparency window which is twice that of traditional EIT can be observed by applying such coupled electric field dropping effect, which may provide a promising way to develop the high resonance intensity meta-surface in the THz region.

show abstract

“…On the other hand, the dark modes-which do-not couple directly to light-can be weakly damped and spectrally narrow. The PIT effect can be realized by the weak hybridization/detuning of two bright modes [39,40] or by the destructive interference of dark-bright modes [13]. Recently, the hybrid designs have been used to obtain a tunable PIT response [12,[41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

“…These designs are based on a graphene layer at the bottom of metasurfaces which tunes the PIT effect at different Fermi levels (E f ). However, these designs are limited to operation in specific wavelength ranges due to the limitations of transparent substrates [14,15,40].…”

Section: Introductionmentioning

confidence: 99%

Tuning Plasmon Induced Reflectance with Hybrid Metasurfaces

2019

View full text Add to dashboard Cite

Electrically tunable metasurfaces with graphene offer design flexibility to efficiently manipulate and control light. These metasurfaces can be used to generate plasmon-induced reflectance (PIR), which can be tuned by electrostatic doping of the graphene layer. We numerically investigated two designs for tunable PIR devices using the finite difference time-domain (FDTD) method. The first design is based on two rectangular antennas of the same size and a disk; in the second design, two parallel rectangular antennas with different dimensions are used. The PIR-effect was achieved by weak hybridization of two bright modes in both devices and tuned by changing the Fermi level of graphene. A total shift of ∼362 nm was observed in the design with the modulation depth of 53% and a spectral contrast ratio of 76%. These tunable PIR devices can be used for tunable enhanced biosensing and switchable systems.

show abstract

A novel graphene metamaterial design for tunable terahertz plasmon induced transparency by two bright mode coupling

Cited by 81 publications

References 39 publications

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Enhanced THz EIT resonance based on the coupled electric field dropping effect within the undulated meta-surface

Tuning Plasmon Induced Reflectance with Hybrid Metasurfaces

Contact Info

Product

Resources

About