Novel dynamic tuning of broadband visible metamaterial perfect absorber using graphene

Abstract

We present a novel dynamic tuning of a broadband visible metamaterial absorber consisting of a multilayer-graphene-embedded nano-cross elliptical hole (MGENCEH) structure. It has multiple effects, including excitation of surface plasmon polaritons and extraordinary optical transmission in the first two metal layers. A numerical simulation shows that the MGENCEH structure can realize broadband perfect absorption (BPA) from 5.85 × 1014 to 6.5 × 1014 Hz over a wide incident angle range for transverse magnetic polarized light if the chemical potential of graphene (uc) is tuned to 1.0 eV. Furthermore, it has high broadband absorption (above 96%) from 4.6 × 1014 to 6.6 × 1014 Hz and three areas of narrowband perfect absorption around 4.65 × 1014, 5.1 × 1014, and 5.6 × 1014 Hz. The changes in the absorption spectra as a function of uc can be classically explained by simply considering plasmons as damped harmonic oscillators. This BPA is broader than the result of Zhou et al. [Opt. Express 23, A413–A418 (2015)] and is particularly desirable for various potential applications such as solar energy absorbers.

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

“…The response frequency and number of response peaks were also tunable. Another approach to the dynamic tuning of graphene based on the chemical potential can be found in Zhou's research, who demonstrated a broadband and perfect absorber. In addition to electrically control EAMs, it is also possible to design stretchable, compressible EAMs or magnetically controllable graphene‐based hybrid materials for dynamic absorptivity modulation.…”

Graphene-Based Nanophotonic Devices

“…The graphene's conductivity can be managed by various parameters such as temperature, duration, dispersion rate, and chemical potential [58]. Several devices are suggested for complete absorption [59,[61][62][63] polarization-insensitive [64][65][66][67], broad-angle [64][65][66][67][68], tunability [69][70][71][72]. For the Terahertz area and the Microwave, others are examined.…”

Engineering Light at the Nanoscale: Structural Color Filters and Broadband Perfect Absorbers

“…With the well‐optimized dimensions (i.e., 600 nm period, 400 nm‐thick top Ni, 100 nm‐thick SiO 2 , 0.85 lateral filling ratio, and enough thick Ni substrate), >90% incident light are absorbed by this modified MDM structure for both polarization from 300 to 1000 nm, wherein absorption effects at short (≈450 nm) and long (≈1000 nm) wavelengths are recognized as the cavity resonance within the hollow regime of the concave grating and magnetic polaritons (i.e., LSPRs), respectively. Considering the wide variety of effects that can absorb light, such as grating diffraction, waveguiding, F–P resonance, PSPRs, LSPRs, etc., this basic idea further enriches the broadband absorber designs so that can satisfy different requirements . Although additional resonators allow flexibilities in selecting desired absorption band positions, most structured described above require delicate resonant cavities, which significantly increases the fabrication complexity, thereby hindering their practical applications.…”