Topological photonics is an emerging field that attracts enormous interest for its novel ways to engineer the flow of light. With help topological protection, surface modes photonic systems have intriguing properties, such as unidirectional propagation, robust transmission against defects and disorders, which meet rapidly growing demands information processing. Valley crystals, one kind systems, not only support protected modes, but also are friendly micro-nano fabrication. These advantages...

Besides chiral edge states, the hallmark of quantum Hall insulators, antichiral states can exhibit unidirectional transport behavior but in topological semimetals. Although such provide more flexibility for molding flow light, their realization usually suffers from time-reversal breaking. In this study, we propose surface a time-reversal-invariant manner and demonstrate our idea with three-dimensional (3D) photonic metacrystal. Our system is semimetal possessing two asymmetrically dispersed...

Chern insulators have been generalized to many classical wave systems and thereby lead potential applications such as robust waveguides, quantum computation high-performance lasers. However, the band structure of a material can be either topologically trivial or non-trivial, depending on how crystal is designed. Here, we propose second in four-dimensional parameter space by introducing two extra synthetic translation dimensions. Since topology bulk bands intrinsically our proposed guaranteed...

There has been significant interest in exploring topological disclination states, which effectively probe the band topology of host material beyond conventional bulk-edge correspondence. While most studies this area have primarily focused on Hermitian systems, recent theoretical work predicts that non-Hermiticity can drive phase transitions and states associated with fractional charge. However, no experimental observations reported to date. Here, we report first observation electric...

The primary clinical challenges associated with postoperative maxillofacial osteosarcoma include high mortality rates and significant local recurrence. Additionally, patients often exhibit substantial bone defects that are incapable of self-healing, necessitating the implantation scaffolds. Multifunctional hydrogels, which enable sustained release therapeutic agents enhance scaffold surface properties, demonstrate potential for management osteosarcoma. In this study, doxorubicin (DOX) PD-L1...

Here, the frequency degree of freedom is introduced into valley photonic crystals with dual band gaps. Based on high-order plane wave expansion model, we derive an effective Hamiltonian which characterizes Metallic are demonstrated as examples in all four topological phases found. At domain walls between topologically distinct crystals, frequency-dependent edge states and a broadband detouring proposed. Our findings provide guidance for designing property structures show its potential...

In this paper, a method for the synthesis of phase-correcting mirrors gyrotron output couplers is presented. A computer code vector analysis electromagnetic fields in mirror systems has been developed terms diffraction theory. Based on surfaces, developed. As an example, system quasi-optical (QO) mode converter 94-GHz TE6,2-mode designed. The QO consists simple, easily manufacturable Vlasov launcher, and two mirrors. Both are adapted optimized using proposed method. simulation results show...

A valley photonic crystal is one type of topological insulator, the realization which needs only P-symmetry breaking. The domain wall between two valley-contrasting crystals supports robust edge states, can wrap around sharp corners without backscattering. Using achieve pulse transmission. Here, using time-domain measurements in microwave regime, we show distortionless transmission a sharply bended waveguide. An \ensuremath{\Omega}-shaped waveguide with four...

Numerical study of electromagnetic (EM) wave transmission through the magnetized plasma layer is presented in this paper. The parameters are derived from computational fluid dynamics simulation flow field around a blunt body flying at supersonic speed and serve as background condition numerical modeling for EM transmission. generated by our newly designed coaxial feed GPS patch antenna. external magnetic applied assumed to vary linearly function wall distance. effects on studied, results...

In order to study the interaction between millimeter wave and plasma, by using time-domain integration method simulate attenuation characteristics of propagation in plasma ,this paper makes preliminary on relationships betwcen value waves density, collision frequency operation frequency. By comparing analyzing theoretical results with simulation results, feasibility fact that can be used provide data support for is verified.

Based on geometry optics theory and vector diffraction theory, mode converter is studied to convert the gyrotron other high-power microwave oscillator output into quasi-optical Gaussian beam, using Vlasov launcher two reflector achieved quasi-Gaussian TEM00 transverse output.The working mechanism of in analyzed, radiation field calculated by surface also current distribution method. A built-in designed 94GHz, TE62 model millimeter wave beam through programming.

In this paper, we present a method to functionalize the very apex of an atomic force microscope cantilever with single or few molecules. spectroscopy interaction mapping, must be functionalized only molecules avoid noise spurious measurements. Here, covalently attached by touching it paper wetted solution quantum dots. The competes wicking up hydrophilic surface tip. This has broad applications in scanning probe microscopy where small numbers are needed on

A compact, efficient, 45GHz/20KW quasi-optical transmission line consisting five mirrors for the ECR ion source, which constructed by Institute of Modern Physics (IMP), Chinese Academy Science has been proposed. computer code vector analysis electromagnetic fields in mirror systems developed terms diffraction theory. Based on Stratton-Chu formula and optimization program, structure obtained. The simulation results show that power efficiency from output Matching Optical Unit (MOU) to vacuum...

In this brief, a 400 kW-level 95-GHz gyrotron has been designed and measured. By linear analysis, TE+22.6 mode is selected as the operating mode. Through time-dependent multimode self-consistent main can steadily operate at conditions: beam voltage of 51.6 kV, current 24 A, radius 11.75 mm, magnetic field 3.62 T. With help CST microwave studio numerical calculation code, single-disk vacuum window for transmission The measured results show that output power 430 kW frequency 95.3 GHz are obtained 3.615

A novel power amplifier unit for a phased array radar with 2 × output ports vacuum electron device is proposed. Double parallel connecting microstrip meander-lines are employed as the slow-wave circuits of large traveling wave tube operate in Ka-band. The high frequency characteristics, transmission and beam–wave interaction processes this simulated optimized. For each port one channel, simulation results reveal that power, saturated gain, 3-dB bandwidth can reach 566 W, 27.5 dB, 7 GHz,...

In this paper a quasi-optical mode converter including simple, easily manufacturable Vlasov launcher, one parabolic mirror and elliptical for 94GHz TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6,2</sub> gyrotron is designed. launcher analyzed in terms of geometric optics theory, the radiation field calculated by Stratton-Chu formula, simulation code written to optimize reflected mirrors. The results show that power transmission efficiency...

Research on two-dimensional van der Waals materials has demonstrated that the layer degree of freedom can significantly alter physical properties due to substantial modification bulk bands. Inspired by this concept, layered photonic systems have been proposed and realized, revealing novel phenomena absent in their monolayer counterparts. In work, we experimentally investigate band structures bilayer valley crystals. Two typical with different stacking configurations are imaged via near-field...

Based on GaN HEMT's high output power, low power loss and efficient heat dissipation, an X-band, 50W solid state amplifier is designed. Slotted-waveguide directional coupler designed as a 2-way divider/combiner. At last, the 165W, combined through three combiners by four amplifiers.

Abstract A numerical synthesis method for optimization of the key components transmission line high‐power fusion gyrotron is proposed in this paper. Combined with analysis method, an algorithm has been developed waveguide to provide higher power transformation efficiency, which 99.447% and 99.9721% TE 01 ‐TE 11 mode converter taper, respectively. The tested designed transfer electromagnetic wave from output port specified position sample be heat. experimental results show that excellent...

Abstract This manuscript details methods to ligate cell‐surface receptors on live cells with precise spatiotemporal control using an atomic force microscope (AFM) deliver ligands. approach can be used image cellular responses upon activating T cell when the AFM is mounted optical microscope. Moreover, measures forces generated by during contact. Using trigger adds important capability field of mechanobiology. We describe how incorporate anti‐CD3 antibodies or other molecules onto cantilever...

Abstract This paper introduces the modeling, simulation, and fabrication of electron optic system (EOS) for high‐power 105 GHz gyrotron, which includes single anode magnetron injection gun, magnetic system, collector. Based on specific research project theory optics, structure with detailed parameters is modeled simulated by using two different electromagnetic analysis softwares. The simulation results show that beam velocity ratio around 1.3, landing regions from softwares are almost agreed...