In this paper we propose a design of an integrated wavelength-tunable vortex beam emitter based on the silicon photonics platform. The proposed device utilizes the free-plasma dispersion effect in order to change the effective index of the ring waveguide, which leads to displacement of the resonant wavelengths. This scheme allows to bypass the dependence of the emitter resonant characteristics from the fabrication errors. Our simulations also show that for the micro-ring resonators with a small free spectral range it becomes possible to switch the emitted vortex order keeping the same wavelength. Such capabilities make the proposed emitter useful in a wide applications range from communication systems to sensors.
In this article we present the brief review of different scenarios of using the photonic integrated circuits (PIC) in the swept-source optical coherence tomography (SS-OCT) with different degree of integration and propose implementation of PICs on the Si/Ge manufacturing technology with integrated analogous balanced photodetectors. The first PIC implementation contains two arms for processing backscattered light and light reflected in “off-axis” mode on the same chip. We present results of simulation of such PIC that demonstrate its functionality. The second PIC implementation provides functionality for the optical processing of the backscattered signals and includes integrated narrow-band filter based on the adjustable unbalanced Mach-Zehnder interferometer for reseting the digital signal processor in the beginning of the every period of the frequency sweep. Implementing the SS-OCT functionality on the PIC will make possible to reduce the cost of the final device, as well as significantly reduce its geometric size, which is an important factor that provides portable use.
In this paper we propose design of the mode converter for implementing in photonic integrated circuits. Mode converter consists of single-mode ring resonator, single-mode access waveguide and multimode access waveguide, and we propose using of vertical coupling, i.e. locating waveguides under the ring with little gap. Using finite difference time domain simulation we showed high efficiency of proposed device design. We showed dependence of the device performance on the shape of multimode waveguide coupler: straight waveguide provide low level of mode crosstalk, “pulley coupling” scheme with small arc angle (about 13 degrees) provide strong wavelength selectivity. Devices with proposed design is suitable for SDM-WDM systems.
We present design of photonic integrated orbital angular momentum (OAM) emitters consisting of access waveguides and ring resonator with top grating made from holes. Access waveguides are coupled to the resonator using “pulleycoupler” scheme. The device is designed for silicon-on-insulator (SOI) manufacturing platform. We simulated singlemode resonator with one access waveguide and shown that it emits two OAM modes in out-of-plane regime. Than we simulated multimode resonator with two access waveguides and shown that it emits up to four OAM modes. The implementation of OAM emitter based on the ring resonator has specific resonance spectrum therefore such devices are WDM compatible. Compactness of such device allows using it in photonic integrated circuits.
The article is devoted to a theoretical study aimed at establishing patterns resonant electron-photon interaction in a sitall nanomaterial. Designed by analytical model of electron-photon interaction(collaboration) for linear and nonlinear regime capacities for the specified material. Developed recommendations on the choice of basic parameters material relevant to their use in plasmon systems to obtain radio frequency spectra in an excited polariton field. An approach is proposed to study the nonlinear process dual-frequency interaction of optical radiation beams with the generation of difference frequencies and excitation of radio frequency surface waves in a planar metal-dielectric structure with crystalline sitall substrate.
This article devoted to an analytical review and detailed analysis of the current state in the field of a formalized description of the physical processes of excitation of the polariton field. The processes of resonant electron-photon interaction in various metal-dielectric structures (including planar) are studied. An approach to modeling the properties of contacting materials leading to the appearance of a surface polariton field has been developed. The process of obtaining the radio frequency spectra of the polariton field is analyzed. A detailed review of metal-dielectric structures and schemes suitable for use in plasmon structures has been performed. The recommended structures for obtaining the radio frequency spectra (of the millimeter and submillimeter ranges) of the plasmon field are determined.
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