Metamaterial perfect absorbers with solid and inverse periodic cross structures for optoelectronic applications

Yu, Haochi; Zhao, Ziyi; Qian, Qinbai; Xu, Jie; Gou, Peng; Zou, Yuexin; Cao, Jun; Yang, Le; Qian, Jie; An, Zhenghua

doi:10.1364/oe.25.008288

Cited by 30 publications

(10 citation statements)

References 37 publications

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“…According to coupled-mode theory (CMT) [28,29,31,32], the optical properties of the MIM structures are determined essentially by two competing loss channels, namely, the radiation loss of the resonance cavity and intrinsic loss due to material absorption. The tunable property of the MIM structure is therefore realizable by changing either of these two channels.…”

Section: Resultsmentioning

confidence: 99%

“…The tunable property of the MIM structure is therefore realizable by changing either of these two channels. From CMT theory, the reflection coefficient (r) of our system can be written as [29],…”

Section: Resultsmentioning

confidence: 99%

“…From Equation (1), r(ω 0 ) = Q a /Q r −1 Q a /Q r +1 when frequency is at its resonance (ω = ω 0 ), which shows that Q a /Q r is the physical quantity to decide the minimum reflection or maximum absorption. Based on Equation (1) and the definitions of Q a and Q r we mentioned above, Q a and Q r of the system with specific structural parameters can be obtained through numerical fitting of our simulation or experimental results [29]. Figure 2a depicts the phase diagram of Q a /Q r as a function of the geometrical parameter W and the material loss tanδ.…”

Section: Resultsmentioning

confidence: 99%

“…The reflectance of the device was mainly influenced by the length and width of the arm. More systematic studies indicate that a longer arm length results in a red-shift of its resonant frequency, while the arm width affects the depth of reflectance [29]. These patterns can generate different dips in reflectance at its resonance frequency.…”

Section: Methodsmentioning

confidence: 98%

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Ultrathin and Electrically Tunable Metamaterial with Nearly Perfect Absorption in Mid-Infrared

et al. 2019

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Metamaterials integrated with graphene exhibit tremendous freedom in tailoring their optical properties, particularly in the infrared region, and are desired for a wide range of applications, such as thermal imaging, cloaking, and biosensing. In this article, we numerically and experimentally demonstrate an ultrathin (total thickness < λ 0 / 15 ) and electrically tunable mid-infrared perfect absorber based on metal–insulator–metal (MIM) structured metamaterials. The Q-values of the absorber can be tuned through two rather independent parameters, with geometrical structures of metamaterials tuning radiation loss (Qr) of the system and the material loss (tanδ) to further change mainly the intrinsic loss (Qa). This concise mapping of the structural and material properties to resonant mode loss channels enables a two-stage optimization for real applications: geometrical design before fabrication and then electrical tuning as a post-fabrication and fine adjustment knob. As an example, our device demonstrates an electrical and on-site tuning of ~5 dB change in absorption near the perfect absorption region. Our work provides a general guideline for designing and realizing tunable infrared devices and may expand the applications of perfect absorbers for mid-infrared sensors, absorbers, and detectors in extreme spatial-limited circumstances.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

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Ultrathin and Electrically Tunable Metamaterial with Nearly Perfect Absorption in Mid-Infrared

et al. 2019

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“…The basic physics lies in that the collective electronic excitations at metal/dielectric interface trap the incidence light in the near field, and induce the effects of electromagnetic field enhancement and light energy concentration. In the past, a variety of metal-based plasmonic structures have been proposed to integrate with the light-absorbing semiconductors to improve their absorption performance [6,7,8,9,10,11,12]. Nevertheless, once the metal structures are fabricated, the resonance wavelength and thus the operation range of these hybrid photosensors will be unchangeable, which greatly hamper the flexible applications in practice.…”

Section: Introductionmentioning

confidence: 99%

A Spectrally Tunable Plasmonic Photosensor with an Ultrathin Semiconductor Region

et al. 2017

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Surface plasmon resonance (SPR) has been widely utilized to improve the absorption performance in the photosensors. Graphene has emerged as a promising plasmonic material, which supports tunable SPR and shows significant flexibility over metals. In this letter, a hybrid photosensor based on the integration of periodic cross-shaped graphene arrays with an ultrathin light-absorbing semiconductor is proposed. A tenfold absorption enhancement over a large range of the incidence angle for both light polarizations as well as a considerably high photogeneration rate (∼ 10 37 ) is demonstrated at the resonance. Compared with traditional metal-based plasmon-enhanced photosensors, the absorption enhancement here can be expediently tuned with manipulating the Fermi energy of graphene. The proposed photosensor can amplify the photoresponse to the incidence light at the selected wavelength and thus be utilized in photosensing with high efficiency and tunable spectral selectivity in the mid-infrared (mid-IR) and terahertz (THz) regime.

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Coherent Chiral‐Selective Absorption and Wavefront Manipulation in Single‐Layer Metasurfaces

Zhang

et al. 2020

Advanced Optical Materials

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Recently, chiral metasurfaces have drawn enormous attentions due to their flexibility in realizing nearly arbitrary chiral effect with designable strength. One intriguing direction in this field is chiral‐selective absorption. However, previous studies mostly require multilayer design and meanwhile often work in a passive way. Here, for the first time to the authors’ knowledge, a chiral‐selective metasurface absorber is experimentally demonstrated with a single‐layer free‐standing metasurface using coherent control method, where the strength of the chiral‐selective behavior can be actively tuned with a 100% modulation depth by simply changing the phase difference between the two coherent inputs. Specifically, under coherent symmetric illumination, near unity absorption is achieved for one circularly polarized incidence, while high‐efficiency cross‐polarization conversion is obtained for the other circularly polarized incidence. Such chiral‐selective absorption property is quite suitable for achieving coherent chiral‐selective wavefront control for the unabsorbed circularly polarized incidence. Three coherent chiral metagratings are designed and experimentally characterized by further employing Pancharatnam–Berry phase method and multiplexed method, where very good performances are achieved. The proposed approach on coherent control can enrich the functionalities and also improve the performances of the conventional single‐layer metasurfaces, which can find extending applications in various practical cases.

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Metamaterial perfect absorbers with solid and inverse periodic cross structures for optoelectronic applications

Cited by 30 publications

References 37 publications

Ultrathin and Electrically Tunable Metamaterial with Nearly Perfect Absorption in Mid-Infrared

Ultrathin and Electrically Tunable Metamaterial with Nearly Perfect Absorption in Mid-Infrared

A Spectrally Tunable Plasmonic Photosensor with an Ultrathin Semiconductor Region

Coherent Chiral‐Selective Absorption and Wavefront Manipulation in Single‐Layer Metasurfaces

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