Optical bistability of a plexcitonic system consisting of a quantum dot near a metallic nanorod

Naseri, Tayebeh; Daneshfar, Nader

doi:10.1007/s40094-018-0298-8

Cited by 13 publications

(6 citation statements)

References 28 publications

(27 reference statements)

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“…This is yet another critical outcome of our investigation. These kinds of ramp like bistable states are already observed in plasmon resonance structures [53,54], graphene based structures [55,56], silicon waveguide resonators [57] and plexcitonic systems [58]. But this is the very first time such a OB/OM is observed in a PT -symmetric FBG device, thanks to the judicious balance between the gain and loss.…”

Section: Broken Pt -Symmetric Regime a Influence Of Gain/loss Parametermentioning

confidence: 75%

“…8(c)). It is important to note that such a mix of stable states resembling a ramp and step has previously been observed in a complex nano-dimer with a semiconductor quantum dot [58]. These kinds of bistable states with flat slopes can be explored in the construction of signal regenerators [3].…”

Section: Broken Pt -Symmetric Regime a Influence Of Gain/loss Parametermentioning

confidence: 85%

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Multifaceted dynamics and gap solitons in $\mathcal{PT}$-symmetric periodic structures

Raja,

Govindarajan,

Mahalingam

et al. 2019

Preprint

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We report the role of PT -symmetry in switching characteristics of a highly nonlinear fiber Bragg grating (FBG) with cubic-quintic-septic nonlinearities. We demonstrate that the device shows novel bi-(multi-) stable states in the broken regime as a direct consequence of the shift in the photonic band gap influenced by both PT -symmetry and higher-order nonlinearities. We also numerically depict that such FBGs provide a productive test bed where the broken PT -symmetric regime can be exploited to set up all-optical applications such as binary switches, multi-level signal processing and optical computing. Unlike optical bistability (OB) in the traditional and unbroken PT -symmetric FBG, it exhibits many peculiar features such as flat-top stable states and ramp like input-output characteristics before the onset of OB phenomenon in the broken regime. The gain/loss parameter plays a dual role in controlling the switching intensities between the stable states which is facilitated by reversing the direction of light incidence. We also find that the gain/loss parameter tailors the formation of gap solitons pertaining to transmission resonances which clearly indicates that it can be employed to set up optical storage devices. Moreover, the interplay between gain/loss and higher order nonlinearities brings notable changes in the nonlinear reflection spectra of the system under constant pump powers. The influence of each control parameters on the switching operation is also presented in a nutshell to validate that FBG offers more degrees of freedom in controlling light with light.

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Section: Broken Pt -Symmetric Regime a Influence Of Gain/loss Parametermentioning

confidence: 75%

Section: Broken Pt -Symmetric Regime a Influence Of Gain/loss Parametermentioning

confidence: 85%

Multifaceted dynamics and gap solitons in $\mathcal{PT}$-symmetric periodic structures

Raja,

Govindarajan,

Mahalingam

et al. 2019

Preprint

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show abstract

“…The occurrence of ramp-like stable states is an uncommon feature in the conventional nonlinear FBG. But these kinds of curves are very common in nonlinear plasmonic structures as well as graphene-based structures [63][64][65][66]. To confirm their existence in a PTFBG in the presence of inhomogeneously decreasing nonlinearity, numerical experiments were conducted at = 3.5.…”

Section: Ob In the Broken Pt -Symmetric Regime: Left Incidencementioning

confidence: 99%

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

et al. 2022

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In the context of parity–time ( P T )-symmetric fiber Bragg gratings, tailoring the nonlinear profile along the propagation coordinate serves as a new direction for realizing low-power all-optical switches. The scheme is fruitful only when the nonlinearity profile will be either linearly decreasing or increasing form. If the rate of variation of the nonlinearity profile is high, the critical intensities fall below the input power of value 0.01 in the unbroken regime provided that the light launching direction is right. Nowadays, every new theoretical inception into the parity–time fiber Bragg grating (PTFBG) has started making sense of switching in the broken P T -symmetric regime, which was once believed to be the instability regime. When the inhomogeneous nonlinearity acts together with the broken P T symmetry and right light incidence, it leads to two peculiar settings. First, the switch-up intensities are ultralow. Second, the switch-down action takes place at zero critical intensities. Such optical bistability curves are unprecedented in the context of conventional gratings and found only in plasmonic devices and anti-directional couplers. Even though the nonlinearity is inhomogeneous, the ramp-like first stable states persist in the broken P T -symmetric regime, giving an additional indication that the broken PTFBG is closely associated with the plasmonic structures. In the existing PTFBG systems, the switching intensities are relatively higher in the broken regime. However, the proposed system records the lowest switching intensities in the broken regime. The reported intensities ( <B Left Incidence: Broken Pt -Symmetric Regimementioning

confidence: 99%

Nonlinear nonuniform $\mathcal{PT}$-symmetric Bragg grating structures

Raja,

Govindarajan,

Mahalingam

et al. 2019

Preprint

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Optical bistability of a plexcitonic system consisting of a quantum dot near a metallic nanorod

Cited by 13 publications

References 28 publications

Multifaceted dynamics and gap solitons in $\mathcal{PT}$-symmetric periodic structures

Multifaceted dynamics and gap solitons in $\mathcal{PT}$-symmetric periodic structures

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

Nonlinear nonuniform $\mathcal{PT}$-symmetric Bragg grating structures

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