Controllable optical bistability based on rotation in semiconductor micro-cavity

2021 ◽  
Author(s):  
Kousik Mukherjee ◽  
Anjan Samanta ◽  
Paresh Chandra Jana
Keyword(s):  
Optical Bistability ◽  
Photon Number ◽  
Optical Memory ◽  
Decay Rates ◽  
Langevin Equations ◽  
Strong Coupling Regime ◽  
Memory Element ◽  
Flip Flop ◽  
Cavity System ◽  
Micro Cavity

In this paper, we discuss a possibility to realize the optical bistability in a rotating semiconductor micro-cavity system. To study the mean cavity photon number profile, we have obtained stationary solution by solving Heisenberg–Langevin equations of motion. In a rotating semiconductor micro-cavity system, bistability is observed when the cavity is driven externally in one direction but not the other direction. The bistable behavior is possible for strong coupling regime, and this can be controlled by hopping strength, decay rates and pump power. The photon profile also shows tunable zero intensity window. The system may be useful to design all-optical switch and optical flip–flop i.e., optical memory element, which would be faster in applications and compact in size.

scholarly journals Efficient and Compact SR-flip Flop Optical Memory Based Photonic Crystals Platform

2021 ◽  
Author(s):  
Amr Hassan ◽  
Nihal F. F. Areed ◽  
Salah S. A. Obayya ◽  
Hamdi El Mikati
Keyword(s):  
Integrated Circuits ◽  
Optical Memory ◽  
Logic Gates ◽  
Power Input ◽  
Small Dimension ◽  
Square Lattice ◽  
Optical Logic ◽  
Flip Flop ◽  
Compact Size ◽  
Multiple Devices

Abstract The paper presents a different type of designing methods and operational improvements of the optical logic memory SR-flip flop (SR-FF). The proposed optical memory SR-FF is based on two optical NOR logic gates which use two-dimension (2D) photonic crystal (PhC) with a square lattice of silicon (Si) dielectric rods. The structure has a switching time in only a few Picoseconds with little power input and very little power loss. The proposed optical memory SR-FF has a small dimension 38x22 μm2 which makes it one of the best optimized and most practical structures to be used in all photonic integrated circuits (PICs). The ultra-compact size enables the possibility of multiple devices to be embedded in a single PIC chip.

Optical bistability in semiconductor lasers

1984 ◽  
Vol 313 (1525) ◽  
pp. 333-340 ◽  
Keyword(s):  
Semiconductor Lasers ◽  
Optical Bistability ◽  
Light Output ◽  
Optical Signal ◽  
Current Drive ◽  
Simple Circuit ◽  
Optical Logic ◽  
Flip Flop ◽  
Injection Lasers ◽  
Circuit Analogy

Absorptive, dispersive and modal bistabilities are considered in semiconductor injection lasers. Previous work is briefly reviewed and the discussion is concerned with experimental work with transverse modal bistability in twin stripe injection lasers. A simple circuit analogy indicates how modal bistability can arise and how it is possible to have stronger light output on the side where the current drive is weakest. Experimental results are reviewed for an optical flip-flop with the use of twin-stripe lasers with three such lasers coupled together in an optical logic circuit. Various mode patterns that have been observed by using different geometries of twin-stripe lasers are discussed. Use is foreseen for active bistable devices in front-end optical signal processing.

scholarly journals Optical Bistability in an Optomechanical System with N-Type Atoms under Nonresonant Conditions

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 122
Author(s):  
Yan Gao ◽  
Li Deng ◽  
Aixi Chen
Keyword(s):  
Optical Bistability ◽  
Light Field ◽  
Photon Number ◽  
Optical Switches ◽  
Atomic Ensemble ◽  
Cavity Field ◽  
Bistable Behavior ◽  
Optomechanical System ◽  
The Mean ◽  
Nonlinear Distribution

In this paper, the phenomenon of the optical bistability of a cavity field is theoretically investigated in an optomechanical system containing an N-type atomic ensemble. In this hybrid optomechanical system, the atoms are coupled with two controlling light fields besides coupling with the cavity field. Under the nonresonant condition, we analyze the influences of the coupling strength between cavity and atoms, Rabi frequencies of the controlling light field, the detuning between the controlling light field and atoms, and pump field power on the optical bistable behavior of mean intracavity photon number. The nonlinear distribution of the mean intracavity photon number has a potential application in field optical switches and optical bistable devices.

All-optical flip-flop based on optical bistability in an integrated SOA/DFB-SOA

2003 ◽  
Author(s):  
Young-Il Kim ◽  
Jae Hun Kim ◽  
Young Min Jeon ◽  
Seok Lee ◽  
Deok Ha Woo ◽  
...  
Keyword(s):  
Optical Bistability ◽  
Flip Flop ◽  
All Optical

scholarly journals Polariton hyperspectral imaging of two-dimensional semiconductor crystals

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Christian Gebhardt ◽  
Michael Förg ◽  
Hisato Yamaguchi ◽  
Ismail Bilgin ◽  
Aditya D. Mohite ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Transition Metal Dichalcogenides ◽  
Binding Energies ◽  
Strong Coupling Regime ◽  
Two Dimensional ◽  
Strong Light ◽  
Optical Cavities ◽  
Metal Dichalcogenides ◽  
High Level ◽  
Micro Cavity

Abstract Atomically thin crystals of transition metal dichalcogenides (TMDs) host excitons with strong binding energies and sizable light-matter interactions. Coupled to optical cavities, monolayer TMDs routinely reach the regime of strong light-matter coupling, where excitons and photons admix coherently to form polaritons up to room temperature. Here, we explore the two-dimensional nature of TMD polaritons with scanning-cavity hyperspectral imaging. We record a spatial map of polariton properties of extended WS2 monolayers coupled to a tunable micro cavity in the strong coupling regime, and correlate it with maps of exciton extinction and fluorescence taken from the same flake with the cavity. We find a high level of homogeneity, and show that polariton splitting variations are correlated with intrinsic exciton properties such as oscillator strength and linewidth. Moreover, we observe a deviation from thermal equilibrium in the resonant polariton population, which we ascribe to non-Markovian polariton-phonon coupling. Our measurements reveal a promisingly consistent polariton landscape, and highlight the importance of phonons for future polaritonic devices.

Optomechanics and Quantum Measurement

2020 ◽  
pp. 183-236
Author(s):  
Aashish A. Clerk
Keyword(s):  
Quantum Measurement ◽  
Linear Response ◽  
Quantum Limit ◽  
Langevin Equations ◽  
Driven Cavity ◽  
Cavity System ◽  
Back Action ◽  
Quantum Optomechanics ◽  
Optomechanical Cavity

After a quick review of the basic theory of quantum optomechanical systems, based largely on linearized Heisenberg–Langevin equations, this chapter focuses on selected topics related to quantum measurement and quantum optomechanics. Included are: a comprehensive discussion of the quantum limit on the added noise of a continuous position detector, following the quantum linear response approach; a detailed discussion of the role of noise correlations, and how these can be achieved in an optomechanical cavity (by using squeezed input light, or by modifying the choice of measured output quadrature); and a discussion of back-action evading measurements of a mechanical quadrature, discussing how this can be achieved in a two-tone driven cavity system. The chapter ends with a quick introduction to the theory of conditional continuous quantum measurement, and a discussion on how a back-action evading measurement can be used to produce conditional mechanical squeezed states.

The su(1,1)-like intensity-dependent Rabi model: A perturbative analysis of weak and strong-coupling regimes

2014 ◽  
Vol 12 (07n08) ◽  
pp. 1560010 ◽  
Author(s):  
Vittorio Penna ◽  
Francesco A. Raffa
Keyword(s):  
Strong Coupling ◽  
Photon Number ◽  
Single Mode ◽  
Strong Coupling Regime ◽  
Model Parameters ◽  
Energy Eigenvalues ◽  
First Case ◽  
Coupling Case ◽  
Rabi Model ◽  
Almost Continuous

We present a perturbative analysis of a Rabi model where the coupling between the quantized single-mode electromagnetic field and the two-level atom depends on the field intensity. Upon modeling the matter–radiation coupling through the Holstein–Primakoff realization of algebra su(1,1), we evaluate first- and second-order eigenenergies and eigenstates both in the weak-coupling regime (atom transition frequency smaller than the coupling strength) and in the strong-coupling regime. In the first case, among various effects, we observe a quadratic dependence on the photon number of energy eigenvalues and the possible formation of level doublets. In the strong-coupling case, the perturbative analysis becomes considerably complex due to the su(1,1)-valued form of the unperturbed Hamiltonian. The critical condition for the transition to an almost continuous spectrum is found in terms of the model parameters.

High Speed All-Photonic Flip-Flop Operation at a Single Wavelength

2015 ◽  
Vol 815 ◽  
pp. 390-393 ◽  
Author(s):  
U. K. Sahbudin ◽  
M.H.A. Wahid ◽  
M.A.M. Azidin ◽  
N.A.M. Ahmad Hambali ◽  
N.R. Yusof ◽  
...  
Keyword(s):  
Phase Modulation ◽  
High Speed ◽  
Optical Bistability ◽  
Full Width Half Maximum ◽  
Optical Amplifiers ◽  
Semiconductor Optical Amplifiers ◽  
Input Power ◽  
Injection Rate ◽  
Flip Flop ◽  
Two Parameters

This work is based on dual Mach-Zehnder interferometer with semiconductor optical amplifiers in both arms. The proposed flip-flop operates at a single wavelength. A bidirectional coupler is placed at the end of the system to observe the output at set and reset terminals. The signals modulate the injected photon rate in the SOAs thus forming photonic flip-flop function. The photon injection rate is modulated due to self-gain modulation and self-phase modulation that occur in the SOAs towards demonstrating optical bistability. Switching between states of the flip-flop occur at full width half maximum of 32 ps. The output power of this flip-flop is around 24.5 mW. It is observed that the switching energy can be adjusted to a low level by decreasing the injected currents into the SOAs. The injection and the input power are the two parameters that govern the whole operation of the designed flip-flop.

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