We propose a scheme to realize super sub-wavelength interference in virtue of high-order spatial correlation with a programmable light source, which can be applied to enhance precision in measurement and control. In this proposal, the light source is produced by modulating the wavefront of a laser beam randomly in time with a phase-only spatial light modulator (SLM). Combing the intensity patterns

Zero-index metamaterials are widely used in electromagnetic devices due to their favorable optical properties such as infinite large-phase velocity and quasi-infinite wavelength. However, insufficient bandwidth and high loss seriously limit the wide application of zero refractive index metamaterials (ZIMs), especially in the terahertz band. Here, we propose a kind of supercell microstructure metamaterial

We report the development of a thermally stable laser-driven phosphor-converted white light source using a multilayer structured diffuser system for general illumination. The developed extended diffuser system comprises an acrylic sheet, two glass plates, and a phosphor layer with the arrangement in a glass-acrylic-phosphor-glass combination. The high-power laser beam was gradually distributed inside

Trapped ions have proven to be a powerful instrument in quantum logic, precision metrology and tests of fundamental theories. Many applications require isotopically pure ion crystals to be trapped; however, selective loading methods require either isotopically pure atom sources or dedicated ultraviolet laser systems. Here we investigate the loading dynamics of the isotopically pure magnesium ion crystals

In this paper, we put forward a protocol for the complete and nondestructive Bell-state measurement of trapped ions. We show that the four different Bell states of two information carriers can be distinguished using two auxiliary ions with the initial Bell states unchanged after the procedures. The parameter selections are discussed based on the experimentally available parameters, and the robustness

The prospects for using multicomponent films produced by aerosol spray pyrolysis for doping bulk ZnSe crystals with optically and electrically active impurities are shown for the first time. Lasing was obtained on ZnSe:Cr active elements doped during hot isostatic pressing treatment from CrS and CdS:Cr films. The lasing efficiency with respect to the absorbed radiation energy at a wavelength of 1.94

High-power Faraday isolators (FIs) for mid-IR radiation are of great practical importance, since they expand the capabilities of constructing optical schemes of solid state mid-IR lasers, which have progressed significantly in recent years. Isolators for high-power radiation with a wavelength of 1.5–2 µ m are especially important for the solid-state lasers in order to cover the entire mid-IR range

Upconversion nanoparticles (UCPNs) capable of emitting near-infrared (NIR) light under NIR excitation attract much attention for bioapplications. However, the low upconversion efficiency and emission intensity significantly limits the progress in utilizing UCPNs. The present work is dedicated to the enhancement of upconversion efficiency and NIR luminescence intensity. The theoretical model that describes

Precision measurement plays a very important role in many field including optics, astronomy, biochemistry, atmospheric science, environmental engineering, dusty plasma, etc. Here, we propose an efficient scheme to investigate the relationship between linewidth and radius of the metal nanoparticle (MNP) in a hybrid optical microcavity system that included a quantum emitters interacting with a MNP. By

In this manuscript, we propose a graphene metasurface composed of an L-shaped pattern to achieve a tunable circular dichroism under oblique incidence in the mid-infrared region. For our graphene extrinsically 3D-chiral structure, there are two graphene localized surface plasmons resonant modes at the wavelength of 11.05 and 16.69 μ m. A broad bandwidth circular dichroism between the two modes is generated

In a local quantum network, multi-qubits in various entangled states might be distributed in different remote nodes due to some peculiar demands. In this paper we consider a seven-qubit entangled state in a given qubit distribution among three participants and study its capacity in quantum teleportation (QT). To be specific, we put forward three controlled QT schemes utilizing the state. In each scheme

We demonstrate passively mode-locked erbium/thulium doped fiber lasers (TDFLs) operating at 1560/1950 nm by using a common gold nanorods (GNRs)/D-shaped fiber as saturable absorber (SA). The SA is prepared by the composite of GNRs with an average aspect ratio of 5.3 and D-shaped fiber, which has broadband absorption from 1000 nm to 3000 nm. By inserting the same SA into an erbium or thulium doped fiber

Chronic rhinitis (CR) is among the most frequent inflammatory diseases of ear-nose-throat (ENT) covering up to 30% of the population. Different forms of CR require different treatment tactics, which indicates the need for an efficient tool for differential diagnostics of CR. Optical coherence tomography (OCT) is a promising tool for fast non-invasive evaluation of nasal mucosa, which, however, requires

For the first time, we have revealed an asymmetric broadening and a 35 cm −1 blue shift (up to 3400 cm −1 ) of the stimulated Raman scattering OH band in water under chirped picosecond pulse train excitation (pulse duration ∼60 ps with 8 ns interval between pulses) while increasing the train length to 25 pulses. From the observed broadening and shift of the OH band centroid, a lower estimate (≥8 ns)

In this letter, sensitivity analysis is adopted to interpret why correspondence ghost imaging can restore better images with fewer reference patterns which have larger bucket value fluctuation: these selected patterns are more alike with regard to the target to be restored. The contribution of reference patterns to imaging can be quantified as sensitivity coefficients. In addition, the peak signal-to-noise

This paper describes the experimental monitoring of pancreatic oxidative metabolism in laboratory mice that combines the methods of fluorescence and diffuse reflectance spectroscopy and laser speckle contrast imaging with a pancreatic ischemia model. The combined measurements show a close dependence of tissue metabolism on blood and oxygen supply. We show that deactivation of complex I and complex

A polarization conversion of a single photon using a semiconductor quantum dot (QD) coupling to a two-mode optical microresonator (MR) is studied. The rotation angle of the polarization vector depends on the orientation of QD axes with respect to MR ones, parameters of the system, and a conversion regime. A nanostructure based on a two-dimensional photonic crystal coupling to a single-electron QD is

For the first time, we monitored the Elbrus volcano activity detecting volcanic gases emanating through pores using an unique eye-safe LIDAR system. A highly sensitive eye-safe LIDAR system was developed for monitoring the fracture-emitted aerosol, which is transported by volcanic gases inside a hot tunnel near the Elbrus Mountain. The developed LIDAR is based on a diode laser (transmitter, 910 nm

We introduce a method of azimuthally invariant 3D Mueller-matrix (MM) layer-by-layer mapping of the phase and amplitude parameters of anisotropy of the partially depolarizing layers of benign (adenoma) and malignant (carcinoma) prostate tumours. The technique is based on the analysis of spatial variations of Mueller matrix invariant (MMI) of histological sections of benign (adenoma) and malignant (carcinoma)

The interactions of a three-level atomic system with a single mode of quantized field is investigated analytically. The effect of coherent population trapping is demonstrated for an arbitrary initial quantum field state and the peculiarities of this regime in squeezed vacuum light are found. Mutual influence between atomic and field subsystems and their entanglement arising during the interaction is

We investigate the loss compensation phenomenon in an asymmetric coupler composed of a pair of unequally sized dielectric cylinders with gain and loss. A multimode analytical approach is applied to solve the eigenvalue problem for the coupler. This approach relies on the field expansion in terms of two sets of orthogonal azimuthal modes, which are coupled due to finite distance between the cylinders

A multifunctional photonic broadband RF memory structure is presented to adapt to more and more complex electronic jamming scenarios. Based on precise sequence control of the structure with integration of switching and amplification functions at the output end, the response time of the structure is greatly reduced to 30 ns. Moreover, multiple jamming modes including reconfiguration of Doppler frequency

An all-solid-state extracavity synchronously pumped Ca 3 (VO 4 ) 2 Raman laser on broadened stretching (854 cm −1 ) and bending (354 cm −1 ) Raman modes with efficient stimulated Raman scattering (SRS) conversion at single frequency shift and the strongest 30-times pulse shortening down to 1.2 ps at combined frequency shift is demonstrated. The antireflection-coated, 78 mm long, a-cut Ca 3 (VO 4 )

Environmental noise is a big obstacle in quantum communication and computation. Quantum error code (QEC) technology can resist the photon transmission loss and decoherence error caused by the environmental noise and has great application potential in future quantum communication and computation fields. The generation of logic qubits or logic entanglement is the important first step of the QEC. The

We report on the wavelength-switchable operation of multiple solitons and dissipative soliton resonance (DSR) in C- and L-band fiber lasers. Mode-locking operations can be alternatively switched between 1565 nm and 1604 nm with adjustments to the polarization controller. Through controlling the intracavity filtering effect, tunable operations have been observed from 1563.7 nm to 1574.6 nm and from

In this paper, we present a computationally highly efficient full-wave model of optical coherence tomography (OCT)-scan formation by focused beams in spectral-domain OCT. Similarly to some previous models, it is based on the summation of fields scattered by discrete sub-resolution scatterers, and enables one to account for the axial and lateral inhomogeneity of the illuminating Gaussian beam. The main

A new approach to the quantum analysis of the spectral linewidths of optical parametric oscillators (OPOs) is proposed. The approach is based on introducing a Hermitian frequency deviation operator. The spectral linewidths in the triply resonant OPO above-threshold regime have been calculated. It has been found that the width of the generated spectral line depends on the loss at all interacting frequencies

In this work we study experimentally the temporal dynamics of an all-normal dispersion all-fiber ring laser far from stable mode locking. Temporal mapping relying on segmented memory capabilities of a fast oscilloscope is used for this purpose. A regime is found where radiation fills the cavity and is characterized by peaks that successively emerge, grow in amplitude while compressing temporally, before

We present an ab initio investigation of the time-frequency characteristics of high-order harmonic generation (HHG) calculated by solving accurately and efficiently the time-dependent Schrödinger equation by means of the time-dependent generalized pseudospectral method. We extend a new synchrosqueezing transform (SST) to obtain the time-frequency spectra of the HHG and the dynamical phase associated

The method for displacement correction along the slow axis of optical coherence tomography (OCT) data volumes is presented. The method is based on the recursive replacement of the next displaced OCT measurements by the weighted summation of itself and the previous OCT measurement in the slow axis dimension already corrected for the displacement. The values of the appropriate weight multipliers were

We investigate the phenomenon of the transverse breaking of symmetry of Gaussian lasers transmitted through dielectrics, showing for which incidence conditions and beam parameters it can be observed in optical experiments. The numerical analysis, done by using the integral form of the transmitted beam at the lower interface of a dielectric prism, shows, for incidence approaching the critical region

We experimentally studied the electromagnetically induced transparency (EIT) in cesium (Cs) vapors under a three-level V -configuration system. Two independent diode lasers were employed in locked and scanning mode, respectively, for pumping and probing the atomic media. A probe laser was scanned across 6 S 1/2 ( F = 4) to all subsutructures of 6 P 3/2 ##IMG## [http://ej.iop.org/images/1612-202X/1

Persistent infection with high-risk human papillomavirus (HR-HPV) is considered as the leading cause of pre-cervical cancer and cancer. Currently, HPV testing is expensive, time-consuming, and requires experienced technicians. Here, we report a method for label-free detection of HR-HPV by recording and analyzing Raman spectroscopy (RS) of cervical exfoliated cell specimens. A total of 315 Raman spectra

The aim of this work is to study the photochemical processes of hydrolysis of biomacromolecules, using the example of DNA in DNA and DNA-Polyethylene glycol (model of nucleoprotein) solutions. The processes induced by the line spectrum of an argon glow discharge lamp (AGDL) (700–1800 nm, 1.7–0.7 eV) have been studied by spectrophotometry, light scattering, turbidimetry, and spectrofluorimetry. It is

The relationship between the fundamental formulas of statistical physics and information theory is considered. It is shown that the M Plank distribution for blackbody radiation and the quantum analog of C Shannon’s capacity for a frequency band-limited classical-quantum channel have a common basis – the principle of particles indistinguishability.

We report on a novel type of h-shaped pulse with femtosecond substructures from a linear-cavity semiconductor saturable-absorber mirror mode-locked thulium-doped fiber laser. It yields a stable nanosecond h-shaped pulse-train with a pulse envelope width ranging from 880 ps to 1.41 ns with a typical substructure pulse duration around 440 fs. The obtained h-shaped pulse is a noise-like pulse with strong

A high pulse energy vacuum ultraviolet (VUV) 177.3 nm nanosecond (ns) laser generated from the sixth harmonic generation of an ns 1064 nm laser (10 ns, 10 Hz) was reported. Firstly, a frequency tripled UV pulse energy of 21.35 mJ at 355 nm was obtained with a pulse duration of 5 ns at a pump pulse energy of 150.6 mJ at 1064 nm. By a KBe 2 BO 3 F 2 (KBBF) prism coupled device containing a 1.6 mm thick

A linear cavity picosecond Er-fiber laser, which was passively and harmonically mode-locked with SESAM, is demonstrated. The advantage of the proposed configuration is the fast tuning of the pulse repetition rate in the range from tens of MHz to 1 GHz, realized by varying the pump power without any additional adjustment of the polarization.

The frequency conversion of Ti:Sapphire laser second harmonic pulses into two-color emission using a tandem of BaWO 4 Raman crystals was experimentally demonstrated with an internal efficiency of ∼17%. The output emission contained symmetrical Stokes and anti-Stokes spectral components separated by 902 cm −1 with a full-width half-maximum bandwidth of ≥110 cm −1 each. The applicability of this two-color

We show that the quality of the underwater imaging can be effectively improved by utilizing the computational ghost imaging (CGI) scheme with shaped Lorentz sources. The formula for the point-spread function in the underwater CGI system with a shaped Lorentz source is derived theoretically, and numerical examples are given to see how the CGI quality can be affected by the oceanic turbulence, including

In this work, we suggest a new algorithm for plotting the singularity lines of an electromagnetic field, which uses its derivatives in a certain area of space and the position of a single point belonging to an unknown singularity line. This algorithm is based on the common properties of rationally parameterizable curves. The implementation of this method is capable of plotting these lines significantly

Quantum tomography is a process of quantum state recognition with multiple measurements. An essential goal for the quantum tomography algorithm is to find measurements that will maximize the useful information about an unknown quantum state obtained through measurements. One of the recently proposed methods of quantum tomography is the algorithm based on rank-preserving transformations. The main idea

We offer and demonstrate a new type of plasmonic metasurface for sensorics and surface-enhanced Raman spectroscopy (SERS) spectroscopy, characterized by a wide spectral range of sensitivity from 450 nm to 850 nm. The metasurface is formed by Ag nanoparticles of different sizes. The metasurface has clear anisotropy formed by the Ag nanoparticles’ size-dependent plasmonic resonances. The resonant wavelength

With the overwhelming success in the field of quantum computing, much attention has been paid to constructing a quantum neural network by combining a classical neural network with quantum computing. In this paper, we propose a novel quantum neural network model based on a quantum version of the sigmoid function, which skillfully combines the non-linear dissipation dynamics of neural computation with

We investigate the distributions of quantum coherence characterized by superadditivity relations in multipartite quantum systems. General superadditivity inequalities based on the α th ( ##IMG## [http://ej.iop.org/images/1612-202X/17/10/105207/lplabae02ieqn1.gif] {$\alpha\geqslant 1$} ) power of l 1 norm of coherence are presented for multiqubit states, which include the existing ones as special cases

The ultrasonic characterization of the propagation of femtosecond laser pulses in pure transparent water and colored phenol-red dye solutions at variable concentrations indicates their thermoacoustic pressure generation due to intrinsic multi-photon absorption in the low-power sub-filamentation regime and sub-linear pressure response of sub-critical plasma via free-carrier absorption in the filamentation

We report here the low-loss double-end coupling of an anti-resonant hollow-core fiber (AR-HCF) with a solid-core single-mode fiber by the fiber tapering technique for the first time. The double-end coupling model is established by the beam propagation method, and the various influences, such as those of insertion depth, tapered waist offset, tapered waist bending, etc, on the coupling efficiency are

This study aimed to evaluate the method of fluorescence diagnostics using the developed video-fluorescent equipment with laser excitation of fluorescence and the assessment of the effectiveness of photodynamic therapy via the photobleaching of the chlorin e6. The boundaries of precancerous conditions and cervical neoplasms were established using video-fluorescent diagnostics and then clarified using

The multiple optomechanically induced transparency (OMIT) of a compound optomechanical system is studied. The system contains two distant cavities and one of the cavity is filled with a three-level atomic medium. We focus on the number of OMIT windows, which is influenced by the coherent interactions between the system components. We find that four transparency windows can be observed from the output

We studied the effect of optical clearing (OC) by glycerol, Omnipaque TM (iohexol), and polyethylene glycol on human skin in vivo using a portable Raman spectroscopy system. Kinetic curves were determined for different concentrations of these optical clearing agents (OCAs). The three agents enhanced OC, showing non-monotonic behavior for serial concentrations. The dehydration mechanism also caused

In this work, laser-induced plasma transmission spectroscopy (LIPTS) was employed to evaluate the low water content in crude oil emulsion by applying a 248 nm ultraviolet laser. The peak of the LIPTS signal (V P ) decreased with the water content C W increasing from 0 to 0.3%. V P increased monotonically as C W increased from 0.3% to 0.5%, and decreased again above C W ∼ 0.5%. One probable mechanism

Stimulated low-frequency Raman scattering (SLFRS) with a maximum efficiency conversion of up to 50% was registered in a water suspension of silica nanoparticles. The dispersion relations of the SiO 2 spheres’ acoustic modes in the surrounding water and the damping parameters were estimated. The experimentally obtained SLFRS frequency shift corresponding to the nanoparticles’ acoustic eigenfrequency

We introduce a new unconditionally solvable level-crossing two-state model given by a constant-amplitude optical field configuration for which the detuning is an inverse-square-root function of time. This is a member of one of the five families of bi-confluent Heun models. We prove that this is the only non-classical exactly solvable field configuration among the bi-confluent Heun classes, solvable

We propose a scheme whereby we optimized the driven pulses applied on qubits to realize fast and robust population of quantum state transfer and entanglement generation between four superconducting flux qubits based on adiabatic passage. The quantum state was transferred from one qubit to another directly with high fidelity through applying an inverted set of pulses. Moreover, the resident time of

We study theoretically the action of subcycle unipolar pulses on the rotational dynamics of polar molecules. We show that efficient excitation of molecular rotational resonances by subcycle pump pulses with respect to bipolar single-cycle one is achieved, provided that duration of excitation pulses is much smaller than the rotational period of the molecule. The excitation probability for different

Based on the quantum-memory-assisted entropic uncertainty relation (QMA-EUR), we study the quantum phase transition (QPT) of a spin-1/2 frustrated Heisenberg chain and show that QMA entropy can be a useful tool to detect QPT. For the six-site case, we choose the reduced two-site as the detecting system and obtain the analytical result of QMA entropy and its bound. We find that the QMA entropy of the

Quantum entanglement is important quanum resources in quantum information sicence. Here we propose an approach to preparing atomic quantum entanglement in a hybrid atom-cavity-fiber system. Using quantum Zeno dynamics method, the system evolution states are always split into a series of Zeno invariant subspaces consisting of dark and bright states. By choosing the initial state of the system, the bright

Proportion-integral-derivative (PID) closed-loop frequency-locking (CLFL) technology has been demonstrated to improve the magnetic field sensitivity of spin-based sensors based on the nitrogen-vacancy (NV) color centers in diamond. First, we analyse the undulation effect of the fluorescence quantum yield of NV centers with a magnetic field. The valley value of the magnetic resonance spectrum have been

The minimum time a system needs to change from an initial state to a final orthogonal state is called the quantum speed limit time. The quantum speed limit time can be used to quantify the speed of the quantum evolution. The speed of the quantum evolution will increase, if the quantum speed limit time decreases. In this work, we will use a relative purity-based bound for the quantum speed limit time

The COVID-19 pandemic has updated research on inactivation of coronaviruses with physical, chemical, and physical-chemical treatments. The review focuses on the inactivation of coronaviruses including the recent SARS-CoV-2 and viruses of other groups with analogous structure using optical radiation. The antiviral effects of different optical ranges from vacuum ultraviolet to infrared radiation are