Tunable Optical Bistability and Tristability in Nonlinear Graphene-Wrapped Nanospheres

Zhang, Kai; Huang, Yang; Miroshnichenko, Andrey E.; Gao, Lei

doi:10.1021/acs.jpcc.7b01519

Cited by 28 publications

(14 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be confirmed in the transmission plot in Figure 2e, in which at the critical point c 1 the lower branch shows 0 transmission, and a slight increase in power causes an abrupt jump to unitary transmission. This behavior has potential in optical applications like optical limiters, nanoswitches [22,43] and nonreciprocal devices [23]. Similar to Figure 2c, we plot in Figure 2f the transmission as the input power increases for different frequencies.…”

Section: Principle Of Operation Of Nonlinearity-based Nonreciprocal Devices Based On Coupled Fano Metasurfacessupporting

confidence: 56%

Free-Space Nonreciprocal Transmission Based on Nonlinear Coupled Fano Metasurfaces

2021

View full text Add to dashboard Cite

Optical nonlinearities can enable unusual light–matter interactions, with functionalities that would be otherwise inaccessible relying only on linear phenomena. Recently, several studies have harnessed the role of optical nonlinearities to implement nonreciprocal optical devices that do not require an external bias breaking time-reversal symmetry. In this work, we explore the design of a metasurface embedding Kerr nonlinearities to break reciprocity for free-space propagation, requiring limited power levels. After deriving the general design principles, we demonstrate an all-dielectric flat metasurface made of coupled nonlinear Fano silicon resonant layers realizing large asymmetry in optical transmission at telecommunication frequencies. We show that the metrics of our design can go beyond the fundamental limitations on nonreciprocity for nonlinear optical devices based on a single resonance, as dictated by time-reversal symmetry considerations. Our work may shed light on the design of flat subwavelength free-space nonreciprocal metasurface switches for pulsed operation which are easy to fabricate, fully passive, and require low operation power. Our simulated devices demonstrate a transmission ratio >50 dB for oppositely propagating waves, an operational bandwidth exceeding 600 GHz, and an insertion loss of <0.04 dB.

show abstract

Section: Principle Of Operation Of Nonlinearity-based Nonreciprocal Devices Based On Coupled Fano Metasurfacessupporting

confidence: 56%

Free-Space Nonreciprocal Transmission Based on Nonlinear Coupled Fano Metasurfaces

2021

View full text Add to dashboard Cite

show abstract

“…Without loss of generality we provide quantitative estimations of parameters for the following configuration: a pair of identical spherical graphene-wrapped nanoparticles made of BaF2. We have chosen such configuration since graphene is a promising highly nonlinear plasmonic material [27][28][29] and BaF2 is transparent and almost dispersion-free in the middle infrared domain where graphene demonstrates plasmonic resonances (see Supplementary Materials for details). In experiment, graphene-wrapped nanospheres can be obtained by using layer-by-layer self-assembly or precursor-assisted chemical vapor deposition [30][31][32].…”

Section: Resultsmentioning

confidence: 99%

Nonlinear Nanophotonic Circuitry: Tristable and Astable Multivibrators and Chaos Generator

Gao

Ginzburg

et al. 2020

Laser & Photonics Reviews

Self Cite

View full text Add to dashboard Cite

The concept of lumped optical nanoelements (or metactronics), wherein nanometer‐scale structures act as nanoinductors, nanocapacitors, and nanoresistors, has attracted a great deal of attention as a simple toolbox for engineering different nanophotonic devices in analogy with microelectronics. While recent studies of the topic have been predominantly focused on linear functionalities, nonlinear dynamics in microelectronic devices plays a crucial role and provides a majority of functions, employed in modern applications. Here, the metactronics paradigm is extended and nonlinear dynamical modalities are added to those nanophotonic devices that have never been associated with optical nanoantennas. Specifically, it is shown that nonlinear dimer nanoantennae can operate in the regimes of tristable and astable multivibrators as well as chaos generators. The physical mechanism behind these modalities relies on the Kerr‐type nonlinearity of nanoparticles in the dimer enhanced by a dipolar localized surface plasmon resonance. This allows one to provide a positive nonlinear feedback at moderate optical intensities, leading to the desired dynamical behavior via tuning the driving field parameters. The findings shed light on a novel class of nonlinear nanophotonic devices with a tunable nonlinear dynamical response.

show abstract

“…Consequently, we will treat it as a conducting film with surface conductivity r with a realistic approximation [40,41]. Hence, the source-free boundary conditions could be applied for the monolayer graphene-coated core-shell [37,38]. The coefficients A, B, and C are determined by applying the boundary conditions at the inner and outer boundary after some algebraic calculations…”

Section: Theoretical Model and Methodsmentioning

confidence: 99%

“…Recently, it is shown that in addition to strengthening the local plasmonic fields, graphene also can generate large nonlinear effects [32][33][34][35][36]. OB in graphene-based composite consisting of graphene-wrapped dielectric spherical nanoparticles has been studied theoretically [37,38]. In optoelectronics aspects, there also has been a great deal of interest in studying the optical properties of graphene due to its abundant potential applications within a wide spectral range from terahertz to visible frequencies [37].…”

Section: Introductionmentioning

confidence: 99%

Terahertz optical bistability of graphene-coated cylindrical core–shell nanoparticles

et al. 2018

View full text Add to dashboard Cite

In this study, we investigate the optical bistability of graphene-coated nanoparticles with cylindrical core-shell structure at terahertz frequency, because graphene displays optical bistability and multistability in a broad range of incident optical intensity. The choice of core-shell system is due to its larger local electric field enhancement, where this characteristic is important for the optical bistable systems. This optical bistability strongly depends on the geometry of the nanoparticle, the fractional volume of the metallic core as well as Fermi energy of graphene. The surrounding medium could also finely affect the optical bistability and induce switching from optical bistability to optical tristability. Since the prosperity of optoelectronics properties of graphene and the importance of core-shell nanoparticles have attracted enormous interest, this model may find potential applications in optical bistable devices such as all-optical switches and biosensors at terahertz communication in near future.

show abstract

Tunable Optical Bistability and Tristability in Nonlinear Graphene-Wrapped Nanospheres

Cited by 28 publications

References 52 publications

Free-Space Nonreciprocal Transmission Based on Nonlinear Coupled Fano Metasurfaces

Free-Space Nonreciprocal Transmission Based on Nonlinear Coupled Fano Metasurfaces

Nonlinear Nanophotonic Circuitry: Tristable and Astable Multivibrators and Chaos Generator

Terahertz optical bistability of graphene-coated cylindrical core–shell nanoparticles

Contact Info

Product

Resources

About