scholarly journals Controllable Fast and Slow Light in the Hybrid Nanomechanical Resonator System

2021 ◽  
Author(s):  
Hua-Jun Chen
Keyword(s):  
Absorption Spectra ◽  
Slow Light ◽  
Fano Resonances ◽  
Light Effect ◽  
Probe Field ◽  
Nanomechanical Resonator ◽  
Phase Dispersion ◽  
Resonator System ◽  
Fast Light ◽  
Slow And Fast Light

Abstract We propose a hybrid nanomechanical resonator (NR) system, where a NR coupled to an embedded quantum dot (QD) driven by two-tone fields is also coupled to another NR via the Coulomb interaction, and investigate the absorption spectra of the probe field under both the condition of resonance and off-resonance. The absorption spectra in resonance presents a means to determine the coupling strength of the two NRs. In the off-resonance, the absorption spectra can exhibit double Fano resonance, and the positions of the double Fano resonances are related to the interaction of the two NRs, the frequencies of the NRs, and the pump detuning. Furthermore, the double Fano resonances are accompanied by the rapid normal phase dispersion, which indicates the slow- and fast-light effect. We can obtain that the group velocity index is tunable by the interaction between the two NRs, the detuning, and the different resonator frequencies, which can reach the conversion from the fast light to slow light.

scholarly journals Nanoresonator Enhancement of Majorana-Fermion-Induced Slow Light in Superconducting Iron Chains

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1435
Author(s):  
Huajun Chen
Keyword(s):  
Slow Light ◽  
Majorana Fermion ◽  
Majorana Fermions ◽  
Light Effect ◽  
Nanomechanical Resonator ◽  
Line Shapes ◽  
Phase Dispersion ◽  
Optical Propagation ◽  
Propagation Properties

We theoretically investigate Fano resonance in the absorption spectrum of a quantum dot (QD) based on a hybrid QD-nanomechanical resonator (QD–NR) system mediated by Majorana fermions (MFs) in superconducting iron (Fe) chains. The absorption spectra exhibit a series of asymmetric Fano line shapes, which are accompanied by the rapid normal phase dispersion and induce the optical propagation properties such as the slow light effect under suitable parametric regimes. The results indicated that the slow light induced by MFs can be obtained under different coupling regimes and different detuning regimes. Moreover, we also investigated the role of the NR, and the NR behaving as a phonon cavity enhances the slow light effect.

Infrared control of slow light in a slab doped by InGaN/GaN quantum dot nanostructure

2015 ◽  
Vol 29 (05) ◽  
pp. 1550012
Author(s):  
Hossein Jafarzadeh ◽  
Elnaz Ahmadi Sangachin ◽  
Seyyed Hossein Asadpour
Keyword(s):  
Quantum Dot ◽  
Communication Systems ◽  
Light Propagation ◽  
Slow Light ◽  
Optical Systems ◽  
Proposed Model ◽  
Ultrahigh Density ◽  
Fast Light ◽  
Slow And Fast Light ◽  
Signal Field

In this paper, we proposed a model for controlling the group velocity of the transmitted and reflected pulses in a slab medium doped by four-level quantum dot nanostructure. Here, an infrared signal field interacted by quantum dot nanostructure can affect the behavior of reflected and transmitted pulses. We show that in the presence and absence of infrared pulses, the other controllable parameters have essential roles for controlling the slow and fast light propagation through the medium. Moreover, we found that the simultaneous slow and fast light can be obtained for the transmitted and reflected pulses by infrared signal field. Our proposed model may be useful for ultrahigh density optical memories in quantum communication systems or in various fields of all-optical systems.

scholarly journals Controllable Fast and Slow Light in Photonic-Molecule Optomechanics with Phonon Pump

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1074
Author(s):  
Huajun Chen
Keyword(s):  
Numerical Simulations ◽  
Laser Field ◽  
Slow Light ◽  
Light Transmission ◽  
Pump Laser ◽  
Probe Laser ◽  
Probe Field ◽  
Optomechanical System ◽  
Optical Output ◽  
Fast Light

We theoretically investigate the optical output fields of a photonic-molecule optomechanical system in an optomechanically induced transparency (OMIT) regime, in which the optomechanical cavity is optically driven by a strong pump laser field and a weak probe laser field and the mechanical mode is driven by weak coherent phonon driving. The numerical simulations indicate that when the driven frequency of the phonon pump equals the frequency difference of the two laser fields, we show an enhancement OMIT where the probe transmission can exceed unity via controlling the driving amplitude and pump phase of the phonon driving. In addition, the phase dispersion of the transmitted probe field can be modified for different parametric regimes, which leads to a tunable delayed probe light transmission. We further study the group delay of the output probe field with numerical simulations, which can reach a tunable conversion from slow to fast light with the manipulation of the pump laser power, the ratio parameter of the two cavities, and the driving amplitude and phase of the weak phonon pump.

Dual coupled-resonator system for plasmon-induced transparency and slow light effect

2016 ◽  
Vol 380 ◽  
pp. 95-100 ◽  
Author(s):  
Qinghao Wang ◽  
Hongyun Meng ◽  
Ben Huang ◽  
Huihao Wang ◽  
Xing Zhang ◽  
...  
Keyword(s):  
Slow Light ◽  
Light Effect ◽  
Resonator System ◽  
Induced Transparency ◽  
Coupled Resonator ◽  
Plasmon Induced Transparency

scholarly journals Tuning Multiple Fano Resonances for On-Chip Sensors in a Plasmonic System

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1559 ◽  
Author(s):  
Shilin Yu ◽  
Tonggang Zhao ◽  
Jianguo Yu ◽  
Dafa Pan
Keyword(s):  
Slow Light ◽  
Ring Cavity ◽  
Metal Structure ◽  
Refractive Index Sensor ◽  
Fano Resonances ◽  
Metal Insulator Metal ◽  
High Efficient ◽  
On Chip ◽  
Resonator System ◽  
Nonlinear Devices

This paper proposed a plasmonic resonator system, consisting of a metal-insulator-metal structure and two stubs, and a Fano resonance arose in its transmittance, which resulted from the coupling between the two stubs. On the basis of the proposed structure, a circle and a ring cavity are separately added above the stubs to create different coupled plasmonic structures, providing triple and quadruple Fano resonances, respectively. Additionally, by adjusting the geometric parameters of the system, multiple Fano Resonances obtained can be tuned. The proposed structure can be served as a high efficient refractive index sensor, yielding a sensitivity of 2000 nm/RIU and figure of merit (FOM) of 4.05 × 10 4 and performing better than most of the similar structures. It is believed that the proposed structure may support substantial applications for on-chip sensors, slow light and nonlinear devices in highly integrated photonic circuits.

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