Dual broadband infrared absorptance enhanced by magnetic polaritons using graphene-covered compound metal gratings

Nguyen-Huu, Nghia; Pištora, Jaromı́r; Čada, Michael

doi:10.1364/oe.27.030182

Cited by 9 publications

(4 citation statements)

References 54 publications

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“…There is no significant difference in the field distribution. Strong localized electric fields at the grating top encourage the light-graphene interaction and the absorption is considerably prompted [30]. For graphene at low doping level as in our study, the wavelength of surface plasmons is very short and cannot be excited in the G-CSG [31].…”

mentioning

confidence: 57%

Ultrabroad perfect absorption of a graphene-covered compound silver grating for mid-infrared multimolecular identification

Chang¹,

Yao²,

Wu³

2022

EPL

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Identifying several species of molecules simultaneously is highly desirable but needs more studies. We propose an ultra-broad PPA in mid-infrared based on a graphene-covered compound silver grating (G–CSG) to detect several molecules. Different grooves are composed in one unit and the wide absorption band consists of individual magnetic plasmon resonances (MPRs). The graphene layer enhances the overall absorption without affecting MPRs. The genetic algorithm is applied to search for suitable structure parameters to enhance the absorption further. The average absorption from 3.0 to 6.0 μm is 0.96 for the optimized G–CSG, which is nearly insensitive to the incidence angle. Strong coupling between plasmons and molecular vibrations results into dips in the ultra-broad absorption band. Multiple molecules can be identified simultaneously. Our study provides an efficient way to achieve ultra-broad PPAs in mid infrared, which may be useful in optoelectronics and biology detections.

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confidence: 57%

Ultrabroad perfect absorption of a graphene-covered compound silver grating for mid-infrared multimolecular identification

Chang¹,

Yao²,

Wu³

2022

EPL

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“…On the other hand, borophene plasmons allows us to realize the active modulation of graphene electroabsorption in a wide waveband, which is not possible for previous reported strategies that based on bulk metallic plasmons, [18] F-P cavity resonance, [26][27][28][29] guide-mode resonance [31][32][33][34][35][36][37] or magnetic polaritons. [38][39][40][41][42][43]…”

Section: Active Modulation Of Graphene Electroabsorption In a Wide Wa...mentioning

confidence: 99%

“…[1,2] Compared to conventional bulk electro-optic crystals, graphene [3] is a 2D material that holds is coupled with a photonic crystal slab on top of a back mirror or a Bragg reflector. [31][32][33][34][35][36][37] Recently, it is also demonstrated that increased absorption in graphene can be achieved by employing deep metallic nano-gratings [38,39] or metal-dielectric-metal multilayer structures. [40][41][42][43] These structures supported magnetic polaritons that enable a strong localized electric field around the graphene surface, which greatly enhanced the graphenelight interactions and thus the light absorption of graphene.…”

Section: Introductionmentioning

confidence: 99%

Active Modulation of Graphene Near‐Infrared Electroabsorption Employing Borophene Plasmons in a Wide Waveband

Nong

Feng

Gan

et al. 2022

Advanced Optical Materials

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The unique optical and electronic properties of 2D materials make them suitable for the design of novel optoelectronic devices with ultracompact sizes, exhibiting great potential for major advances in the state of art of existing techniques. Here, for the first time, a prototype of a modulator is theoretically presented for the active modulation of graphene electroabsorption enabled by the tunable anisotropic borophene plasmons. Simulations reveal that the strong localized electrical field induced by borophene plasmons can significantly improve the graphene electroabsorption, of which the center wavelength can be further dynamically controlled by gate tuning the resonant wavelength of borophene plasmons. Then by gate tuning the graphene Fermi energy to transform graphene between a lossy and a lossless material, electrically switched absorption of graphene with modulation depth of 100% can be realized within a wide waveband in the near‐infrared region, including the commercially important telecommunication wavelength of 1.55 µm, indicating the excellent performance of the designed modulator via such mechanism. Such wavelength‐tunable graphene electroabsorption modulation strategy based on borophene plasmons provides an effective method for the design of graphene‐based selective multichannel switches or modulators, which is unavailable in previous reported strategies that can be only realized by passively changing the structural parameters.

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“…In the present study, we propose CGs used to enhance graphene absorption, and its enhancement is caused by strong localized electromagnetic fields inside grating trenches and surface plasmons. A CG has a several multiple grating periods [34], and it is also named as a double-period grating, a dual-pitch grating, a dual-period grating or a complex grating [35][36][37][38]. On the contrary, a simple grating (SG) has a single [17].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wide Spectral Bandwidth and Enhanced Absorption in a Metallic Compound Grating Covered by Graphene Monolayer

Nguyen-Huu

Pištora

Čada

et al. 2021

IEEE J. Select. Topics Quantum Electron.

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Graphene, a two-dimensional monatomic layer of carbon material, has demonstrated as a good candidate for applications of ultrafast photodetectors, transistors, transparent electrodes, and biosensing. Recently, many studies have shown that using metallic deep gratings could enhance the absorptance of graphene of 2.3% up to 80% in the near infrared region for applications in photon detection. This paper presents utilizing a nanograting structure, namely, a compound metallic grating could greatly enhance the absorptance of graphene up to 98% and widen its spectral bandwidth to 0.6 µm, which are greater than those of previous work. The study also showed that the absorptance spectrum is insensitive to angles of incidence. Furthermore, the proposed graphene-covered compound grating might bring a lot of benefits for graphene designs-based optical and optoelectronic devices.

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Dual broadband infrared absorptance enhanced by magnetic polaritons using graphene-covered compound metal gratings

Cited by 9 publications

References 54 publications

Ultrabroad perfect absorption of a graphene-covered compound silver grating for mid-infrared multimolecular identification

Ultrabroad perfect absorption of a graphene-covered compound silver grating for mid-infrared multimolecular identification

Active Modulation of Graphene Near‐Infrared Electroabsorption Employing Borophene Plasmons in a Wide Waveband

Ultra-Wide Spectral Bandwidth and Enhanced Absorption in a Metallic Compound Grating Covered by Graphene Monolayer

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