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In previous work, we propose to develop a novel kind of terahertz radiation source which utilizing free electron beam to excited graphene surface plasmon polaritons (GSPPs) combining vacuum electronics and new 2D material graphene. The previous theoretical analysis show that this coherent radiation source can be tuned covering almost whole THz frequency range and work at room temperature. In this...
A physical mechanism is presented which can generate coherent and tunable terahertz (THz) radiation. Due to the dramatical lifting of SPPs energy, the dispersion can cross the light line, thus, the SPPs excited by an moving electron beam can be transformed into THz radiation. The radiation power density is enhanced nearly three orders, up to 105 W/cm2. The radiation frequency can be widely tuned by...
Surface Plasmon Polariton Light Radiation Source (SPCLS) combines electronics and photonics to generate coherent, enhanced and tunable radiation ranging from terahertz to ultraviolet. To further improve its performance, an extension structure of SPCLS (ESPCLS) is proposed: two silver films with different thickness are deposited on two dielectric substrates to establish a new unsymmetrical structure...
Terahertz grapheme surface plasmon polaritons (GSPPs) radiation source excited by electron beam has been presented. Here we show the theoretical analysis and initial experimental results on this kind of terahertz source. The theoretical calculations of greatly enhancement due to GSPPs and wide tunability indicate that this mechanism has huge potential. THz TDS is utilized to obtain conductance of...
A novel physical mechanism is reported which can generate coherent and tunable terahertz (THz) radiation. Due to the natural periodicity of 2π of circular cylindrical graphene structure, the surface plasmon polaritions (SPPs), excited by a cyclotron electron beam (CEB), can be transformed into radiation. The radiation density is strongly enhanced over two orders, up to 105 W/cm2. The radiation frequency...
Terahertz grapheme surface plasmon polaritons (GSPPs) radiation source excited by electron beam has been proposed. We demonstrate the initial experimental measurement of conductivity of single layer graphene sheet. Conductivity mapping of sheet graphene has been carried out which is helpful for both of theoretical analysis and experimental design. The changes of conductance and mobility of graphene...
In the paper, we discuss the possibility of electron beam excitation of surface plasmon in conducting metal. Then, planar perfect structure with subwavelength holes has been proposed. The phenomenon has been proven theoretically and numerically that mimicking surface plasmon wave can be excited and amplified by electron beam. The mechanism of penetration of subwavelength holes array is exploited to...
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