In this study, a model of double-quantum-dot system driven by two-mode microwave photons is presented. The quantum master equation derived from the system’s Hamiltonians, and expression for steady-state current obtained. Electronic tunneling properties are then analyzed. results revealed that different have varying effects on within system, with steplike trend emerging. showed pronounced negative differential conductance both coherent squeezed photons. Furthermore, was significantly...

Abstract Phonon statistics in a hybrid optomechanical system, where mechanical resonator is quadratically coupled to cavity and couples with another via Coulomb interaction studied. It found that the conventional unconventional phonon blockade can be both achieved at same parameter regime, which confirmed by analytical numerical results. By analyzing energy level structure, it anharmonicity of system joint action coupling, nonlinearity introduced latter has more significant effect on one...

Metasurfaces have powerful light field manipulation capabilities, which been extensively studied in the past few years and developed rapidly various fields. At present, focus of metasurface research has shifted to tunable functionality. In this paper, a temperature-controllable multifunctional lens based on phase transition material is designed. First all, by controlling temperature desired working area polarization incident light, switching among multiple focus, single no at any position...

Quasi-bound states in the continuum provide an effective and observable way to improve metasurface performance, usually with ultra-high-quality factor. Dielectric metasurfaces dependent on Mie resonances have characteristic of significantly low loss, polarization can be affected by parameter tuning structure. Based theory quasi-bound continuum, we propose simulate a bifunctional resonant metasurface, whose periodic unit structure consists four antiparallel symmetrical amorphous silicon...

Abstract A passive mode-locked thulium-doped fiber laser is a generator for 2 μm ultra-short pulses. In addition, self-similar pulses also exhibit rich nonlinear dynamic characteristics in lasers. Therefore, this article studies the of laser. The research results indicate that as gain coefficient increases, peak power pulse width widens, and linearity chirp increases.

With the rapid development of technology in medical industry, hospitals have begun to introduce AI devices for auxiliary diagnosis. Among these, ultrasound imaging analysis has started play a very important role daily case diagnosis doctors. This paper will use deep learning neural network build single-object tracking network, applied field imaging, achieve thyroid nodules. The algorithm three networks cascade. In first frame video, backbone extract features selected area interest as...

The concurrence evolution of two qubits coupled with one-mode cavity separately is investigated exactly without adopting the rotating-wave approximation. results show that for resonant case, behaviour system similar to Markovian case when coupling strength weak, while vanishes in a finite time and might revive fractional initial entanglement before it permanently strong. And detuning could periodically recover after complete disentanglement. These are quite different from those subjected...

In a single quantum dot (QD) system connected with ferromagnetic electrodes, the electron transport properties, assisted by thermal and Fock state optical fields, are theoretically studied Keldysh nonequilibrium Green's function approach. The results show that evolution properties of density tunneling current field, quite different from those state. photon sideband shift decreases monotonously increase in electron-photon coupling strength for case state, while is oscillatory Negative...

In this work, the waiting time distribution (WTD) statistics of electron transport through a two-channel quantum system in strong Coulomb blockade regime and non-interacting dots are investigated by employing particle-number resolved master equation with Born–Markov approximation. The results show that phase difference between two channels, asymmetry dot-state couplings to left right electrodes, repulsion have obvious effects on WTD system. certain parameter range, manifests coherent...

Abstract Thermal lens technology has attracted much attention because of its high sensitivity, low detection limit and being suitable for the analyses minute samples. been widely used in many fields, such as chemistry, physics, environmental monitoring, electronics, material science life science. In this paper, laser thermal measurement is studied based on Newton’s ring interferometry, especially case low-power laser. The application method small samples also discussed. It helpful to study...

By considering higher-order effects, the properties of self-similar parabolic pulses propagating in microstructured fibre amplifier with a normal group-velocity dispersion have been investigated. The numerical results indicate that effects can badly distort pulse shape and optical spectrum, at same time peak shift oscillation appear, while still reveals highly linear chirp but grows into asymmetry. influence different on propagation has analysed. It shows self-steepening plays more important...

Employing the technique of symmetry reduction analytic method, we solve Ginzburg–Landau equation with varying nonlinear, dispersion, gain coefficients, and dispersion which originates from limiting effect transition bandwidth in realistic doped fibres. The parabolic asymptotic self-similar analytical solutions medium normal GVD is found for first time to our best knowledge. evolution pulse amplitude, strict linear phase chirp effective temporal width are given self-similarity results...

In this paper, the numerical technique that is Fast Hankel Transform presented for beam propagation in two transverse dimensions with cylindrical symmetry. The based on Fastest Fourier West, and its application discussed.

Using the methods based on technique of self-similar analyzing, we find parabolic asymptotic analytical solutions with third-order dispersion effect constant coefficient Ginzburg-Landau equation which considers both influence high order and gain evolution pulse. The amplitude function, phase strict linear chirp function effective temporal pulse width are given in paper. results show that pulses still have remarkable effect. And these theoretical consistent numerical simulations.

In this paper, using the particle-number-resolved master equation, properties of full counting statistics (FCS) are investigated for a single quantum dot (QD) system interacting with optical fields in thermal state, Fock coherent and state random phase. these diverse states fields, average tunneling currents have different step shoulder heights at lower bias voltage same light intensity, staircase-shaped current can be induced unexpectedly vacuum field. The characteristics Fano factor...

Airy beams have received considerable attention due to their unique features on propagation, including non-spreading, self-healing, self-accelerating, and parabolic trajectories. Here in this work we study the propagation of linearly polarized with an added spherical phase uniaxial crystal orthogonal optical axis. Based beam transmission theory crystals, analytical expressions for intensity distribution different view planes are derived. Numerical calculations performed some novel presented...

With the presence of a driving field applied to double quantum dots and control on cavity, transmission performance group delay effect probe have been theoretically studied in hybrid optomechanical system (HOMS). Due interaction between mechanical mode system, optomechanically induced transparency (OMIT) arises HOMS. assistance field, can be tuned switch any one two OMIT windows, both windows or off by dynamically adjusting optical field. Furthermore, transmitted fields absorbed amplified...

The campus air environment directly affects the physical and mental health of teachers students. In order to provide a quick accurate way monitoring environment, this paper develop real-time detector based on Microcontroller Unit (MCU) STM32 sensor. system can detect dust particles PM2.5, harmful gas carbon monoxide (CO) concentration, temperature, humidity illumination, display detected data organic light-emitting diode (OLED) screen, transmit WeChat applet for viewing. results show that...

In this study, we design a one-dimensional periodoic ring multi-connected optical waveguide network to solve the problem of obtaining ultra-wide photonic band gaps that are too complex for gap width be tuned. Analyzing spatial structures and numerical relations our reveals common characteristic is independent number nodes in unit cell network. Based on character, explore potential practicability by comparing it with existing schemes. Our has advantages lower complexity topology, better...