We propose an all-optical half adder based on two different cross structures in two-dimensional photonic crystals. One structure contains nonlinear materials and functions as "AND" logic gate. The other one only linear acts "XOR" system is demonstrated numerically by the FDTD method to work expected. optimal operating speed without considering response time of material, least ON OFF logic-level contrast ratio, minimum power for this obtained were 0.91 Tbps, 16 dB 436 mW, respectively....

In this study, we evaluate the penetration capability of light in visible, near-infrared-I (NIR-I) and near-infrared–II (NIR-II) optical windows for photoacoustic macroscale imaging inside 9 biological tissues with three typical depths. An acoustic resolution microscopy is designed to guarantee consistent experiment conditions except excitation wavelength. Experimental results show that short NIR-II (1000-1150 nm) shows best performance kidney, spleen liver at all depths, while NIR-I...

A narrowband tunable antireflection optical filter is proposed and numerically studied. The structure a metasurface based on plasmonic nanoparticles an electro-optic film in three-layer configuration of metal-dielectric-metal (MDM) the visible near-infrared range. By tuning voltage thus refractive index dielectric LiNbO3, one can shift wavelength minimum reflection as desired. parameters gold other elements used for design are obtained by finite-element method (FEM). An analytical theory...

A highly efficient and broad light absorber capable of wide-angle absorption in the visible near infrared range is presented numerically investigated for energy harvesting a simple geometry. According to calculated results, proposed device has peak level about 99.95%. The actual efficiency 76.35%, which approaching that complex multilayer absorbers with 88 layers working wavelength 300 nm 2000 nm. electro-optic material potential shifting position, compensating fabrication errors thus...

Microwave-induced thermoacoustic imaging (MTAI) has emerged as a potential biomedical modality with over 20-year growth. MTAI typically employs pulsed microwave the pumping source, and detects microwave-induced ultrasound wave via acoustic transducers. Therefore, it features high resolution, rich electromagnetic contrast, large depth. Benefiting from these unique advantages, been extensively applied to various fields including pathology, biology, material medicine. Till now, deployed for...

We report spectral splitting behaviors based on Fano resonances in a novel simple planar metasurface composed of gold nanobars and nanorings. Multiple plasmonic modes sharp effects are achieved broadband transmittance spectrum by exploiting the rotational symmetry metasurface. The transmission properties effectively modified tuned modulating structural parameters. highest single side Q-factor FoM which reaches 196 105 observed at resonances. Our proposed design is relatively can be applied...

High-speed optical amplitude modulation is important for communication systems and sensors. Moreover, nano-optical modulators are developing optical-communication-aided high-speed parallel-operation processors micro-biomedical sensors inside-blood-capillary examinations or microsurgery operations. In this paper, we have designed a plasmonic resonant tunable metasurface with barium titanate (BTO) as nanoscale modulator high index speed. The BTO operated well in the VIS near-IR ranges,...

THz waves have interesting applications in refractive index sensing. A gas sensor based on the guided Bloch surface wave resonance (GBSWR) a one-dimensional photonic crystal (1DPhC), which consists of periodic polycarbonate (PC) layers and polyvinylidene fluoride (PVDF) layers, has been proposed. Numerical results finite element method (FEM) show that band gap confines (BSWs) lies regime 11.54 to 21.43 THz, can transmit both PC PVDF with ignored absorption. The calculated sensitivity...

Abstract Simultaneous realization of high quality factor ( Q ), sensitivity, and figure merit (FOM) play a pivotal role in building the THz sensor. For such purpose, we propose an all-polymeric Bloch surface wave (BSW) structure that supports bright BSW mode dark Fano state is embedded continuum, both which coupled to same radiation channels. The existence sharp dip with maximum depth line could be interpreted physics Friedrich–Wintgen bound states continuum (FW-BICs), because destructive...

Abstract GaInSb crystal is a promising substrate material that can be used to prepare various high-performance devices. Ga 0.86 In 0.14 Sb and Al-doped (Ga Sb:Al) crystals were grown with the vertical Bridgman method (VB). The doping concentration of aluminum (Al) 0.005–0.015 molar ratio. effect Al on structure properties was studied. results indicated significantly reduced segregation indium (In) component in crystal, radial reaching minimum 0.051 mol% mm −1 axial 0.067 . also improved...

Linear tunability has important applications since it can be realized by using linear control voltage and used conveniently without requiring nonlinear scale. In this paper, a kind of plasmonic nanostructure with waveguide loaded two rectangular cavities coupled circular cavity is proposed to produce four Fano resonance modes. The transfer matrix theory employed analyze the coupled-waveguide-cavity system. By analyzing property each single cavity, reveals that resonances are originated from...

A new type of compact three-port circulator with flat-top transmission band (FTTB) in a two-dimensional photonic crystal has been proposed, through coupling the cascaded magneto-optical resonance cavities to waveguides. The coupled-mode theory is applied investigate coupled structure and analyze condition achieve FTTB. According theoretical analysis, further optimized ensure that for achieving FTTB can be satisfied both cavity-cavity cavity-waveguide coupling. Through finite-element method,...

In this study, we developed microwave-induced thermoacoustic endoscopy (TAE), which employs a high-repetition-rate pulsed microwave generator for external excitation and side-view focused ultrasound transducer internal acoustic detection. The system yields lateral resolution of 1.5 mm an axial 0.35 mm. penetration depths saline-containing tube (5% NaCl) tumor lesions in biological tissues are 9 6 cm under current experimental conditions, respectively. To improve the signal-to-noise ratio...

A significant approach for manipulating light propagation through scattering media consists of the measurement transmission matrices (TMs). Here we propose a TM-measurement method with high stability and universal applicability, which call self-reference method. This uses new, to best our knowledge, way perform holographic measurement, where reference is superimposed directly signal light. does not pose any restriction on light, so it applicable nearly all types input bases. The effectivity...

Microwave-induced thermoacoustic imaging (MTAI) using low-energy and long-wavelength microwave photons has great potential in detecting deep-seated diseases due to its unique ability of visualizing intrinsic electric properties tissue high resolution. However, the low contrast conductivity between a target (e.g., tumor) surroundings sets fundamental limit for achieving sensitivity, which significantly hinders biomedical applications. To overcome this limit, we develop split ring resonator...

We present an overview on our recent work about a number of metasurfaces and their applications in absorbers, biosensors, nano modulators. High-efficiency absorption, high bio tissue sensitivity, high-performance modulation are demonstrated. The results interesting for various including photonic integrated circuits devices solar energy utilization, optical signal processing, computations, communications, inside-body examination sensing, discrimination, cancer disease diagnosis.

In this paper, a kind of chaos encryption system is presented based on chaotic algorithm and traditional algorithm, hardware implemented by using the FPGA technology. According to discrete digital technologies, Henon Map Logistic are applied, iteration sequence generated Verilog HDL language By combining files encrypted decrypted. Based Xilinx exploitation platform, secret communication experiments Internet successefully. The devise has potential prospective applications in internet secrecy...

In this paper, a wide-angle broadband perfect absorber is composed of periodical metamaterial heterostructure. The structure designed according to the concept that absorber's resonant frequency range can be manipulated by adjusting filling factor bi-insulator calculated results reveal four-layer herostructure has four absorption peaks at terahertz band. related bandwidth 300 GHz and average absorptivity 98.6%. At same time, insensitive incident angle.

We propose a type of polarization-independent circulator based on ferrite and plasma materials in two-dimensional photonic crystal (PhC) slab. First, the basis analyzing wave equations materials, TE TM circulators are realized with PhCs, respectively. Then, by properly combining these two types together, is achieved investigated. The results show that, for both polarizations, insertion loss isolation less than 0.15 dB more 20 dB, Finite-element method used to calculate characteristics...

A graphene-loaded metamaterial absorber is investigated in the mid-infrared region. The light-graphene interaction greatly enhanced by virtue of coupled resonance through a cross-shaped slot. absorption peaks show significant blueshift with increasing Fermi level, enabling wide range tunability for absorber. simple circuit model well explains and predicts this modulation behavior. Our proposal may find applications variety areas such as switching, sensing, modulating, biochemical detecting.

The axial focus number (the of focal spots along the direction) and intensity a micro-Fresnel zone plate (FZP) are analyzed from deep ultraviolet to infrared using Fourier decomposition, vectorial angular spectrum (VAS) theory, three-dimensional finite-difference time-domain (FDTD) method. For low-numerical aperture (NA) micro-FZP (NA<0.1), there multiple high-order foci, each decreases slowly. However, rapidly with NA increasing. relatively high-NA (NA>0.3), foci suppressed is one...

Abstract A colorless Ce 3+ ‐activated borosilicate scintillating glass enriched with Gd 2 O 3 is successfully synthesized in air atmosphere for the first time. The full replacement of 10 mol% BaO by Al , and partial substitution SiO Si N 4 designed composition are crucial this success. role on tuning optical properties analyzed transmittance, X‐ray absorption near edge spectroscopy (XANES) spectra, photoluminescence (PL) radioluminescence (RL) spectra. results suggest that stable 4+ ions can...