Simultaneously achieving narrowband and broadband light absorption enhancement in monolayer graphene

Yan, Zhendong; Gao, Lei; Tang, Chaojun; Lv, Bin; Gu, Ping; Chen, Jing; Zhu, Mingwei

doi:10.1016/j.diamond.2022.109122

Cited by 25 publications

(6 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This limitation hinders the practical applications of high-performance photodetectors based on 2D materials. To address this challenge, researchers have primarily focused on special device structure designs, such as distributed Bragg reflector microcavities, metallic reflectors, photonic crystal nanocavities, etc [154][155][156], to confine light within the 2D materials and thereby enhance light absorption. In addition, under the influence of an ultrahigh ferroelectric polarization field, the band of 2D materials in FeFETs can be changed, thereby broadening the light response range of the detector.…”

Section: Discussionmentioning

confidence: 99%

2D materials-based photodetectors combined with ferroelectrics

Bai,

Wu,

Yang

et al. 2024

Nanotechnology

View full text Add to dashboard Cite

Photodetectors are essential optoelectronic devices that play a critical role in modern technology by converting optical signals into electrical signals, which are one of the most important sensors of the informational devices in current “Internet of Things” era. Two-dimensional (2D) material-based photodetectors have excellent performance, simple design and effortless fabrication processes, as well as enormous potential for fabricating highly integrated and efficient optoelectronic devices, which has attracted extensive research attention in recent years. The introduction of spontaneous polarization ferroelectric materials further enhances the performance of 2D photodetectors, moreover, companying with the reduction of power consumption. This article reviews the recent advances of materials, devices in ferroelectric-modulated photodetectors. This review starts with the introduce of the basic terms and concepts of the photodetector and various ferroelectric materials applied in 2D photodetectors, then presents a variety of typical device structures, fundamental mechanisms and potential applications under ferroelectric polarization modulation. Finally, we summarize the leading challenges currently confronting ferroelectric-modulated photodetectors and outline their future perspectives.

show abstract

Section: Discussionmentioning

confidence: 99%

2D materials-based photodetectors combined with ferroelectrics

Bai,

Wu,

Yang

et al. 2024

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…Here graphene is defined using the anisotropy refractive index model with the in-plane refractive index ni = 3 + i5.446λ/3 μm -1 and the out-of-plane refractive index no = 1, which coincides well with the conductivity model in the near-IR band 8 . The Kerr effect of silicon is described using the relationship of relative permittivity and local electric field: 2 , where εr(ω) is the relative permittivity of silicon under electric field intensity, εr0(ω) is the intrinsic relative permittivity of silicon, χ (3) is the third-order susceptibility of silicon and |Eloc| is the amplitude of local electric field. Here εr0(ω) is set to 11.56 which is the square of the silicon's refractive index, and χ (3) is set to 2.79 × 10 -18 m 2 /V 2 , according to reported researches 9, 10 .…”

Section: Basic Model and Parameter Settingsmentioning

confidence: 99%

“…Graphene, as a novel 2D material, has been intriguing to researchers over the years because of its outstanding optical and electronic properties, such as full-band absorption rate, ultrafast respond speed, ultrahigh carrier mobility and highly tunable conductivity 1 . However, due to its ultrathin thickness, the interaction between light and monolayer graphene is very weak, which limits the application of graphene in the optical field 2 . To overcome this drawback, one of the promising methods of applying graphene to the optical field is to couple it with silicon, in order to combine the significant optical-electronic properties of the two materials.…”

Section: Introductionmentioning

confidence: 99%

Low-threshold and high-extinction-ratio optical bistability within a graphene-silicon-based perfect absorber

Zhang¹,

Fan²,

Sun³

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

View full text Add to dashboard Cite

We propose and numerically simulate a kind of graphene-silicon-based perfect absorber which possesses high-quality optical bistability in the near-IR band. In the structure, monolayer graphene is sandwiched between two silicon layers and is coupled with a 1D dielectric grating. With the help of the absorption rate of the monolayer graphene and the leakage rate of the grating structure, the critical coupling condition is satisfied and the incident light can be almost completely absorbed by the graphene at the resonant wavelength, causing prominent enhancement of electric field and light-matter interaction. Considering the third-order susceptibility of silicon together with the electric field enhancement, the perfect absorber shows significant bistable characteristics with ultralow thresholds and ultrahigh extinction ratio.The demonstrated switching thresholds can be lower than 90 kW/cm 2 , which can be further cut down by changing the structural parameters. The extinction ratio of the bistable states reaches an ultrahigh level of over 30 dB, since the structure is critically coupled with no reflected light coming out at the off state. The proposed bistable structure with compact size, low thresholds and high extinction ratio can be of great applications in the optical communication field.

show abstract

“…However, the interaction between light and monolayer graphene is very weak due to the ultrathin thickness of graphene, which seriously limits the applications of graphene in the optical field. In order to greatly enhance the light-graphene interaction, many kinds of graphene-based resonators [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ] and perfect absorbers [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ] have been proposed, and some applications of those structures have been demonstrated [ 35 , 36 , 37 , 38 , 39 ]. Until now, OB in graphene-based resonators has been theoretically and numerically studied [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

Low-Threshold and High-Extinction-Ratio Optical Bistability within a Graphene-Based Perfect Absorber

et al. 2023

View full text Add to dashboard Cite

A kind of graphene-based perfect absorber which can generate low-threshold and high-extinction-ratio optical bistability in the near-IR band is proposed and simulated with numerical methods. The interaction between input light and monolayer graphene in the absorber can be greatly enhanced due to the perfect absorption. The large nonlinear coefficient of graphene and the strong light-graphene interaction contribute to the nonlinear response of the structure, leading to relatively low switching thresholds of less than 2.5 MW/cm2 for an absorber with a Q factor lower than 1000. Meanwhile, the extinction ratio of bistable states in the absorber reaches an ultrahigh value of 47.3 dB at 1545.3 nm. Moreover, the influence of changing the structural parameters on the bistable behaviors is discussed in detail, showing that the structure can tolerate structural parametric deviation to some extent. The proposed bistable structure with ultra-compact size, low thresholds, high extinction ratio, and ultrafast response time could be of great applications for fabricating high-performance all-optical-communication devices.

show abstract

Simultaneously achieving narrowband and broadband light absorption enhancement in monolayer graphene

Cited by 25 publications

References 84 publications

2D materials-based photodetectors combined with ferroelectrics

2D materials-based photodetectors combined with ferroelectrics

Low-threshold and high-extinction-ratio optical bistability within a graphene-silicon-based perfect absorber

Low-Threshold and High-Extinction-Ratio Optical Bistability within a Graphene-Based Perfect Absorber

Contact Info

Product

Resources

About