【摘 要】
：
In this work, we report a broadband terahertz wave modulator based on a top-gate graphene field effect transistor with polyimide as the gate dielectric on a PET substrate. The transmission of the terahertz wave is modulated by controlling the Fermi level
【机 构】
：
StateKeyLaboratoryofElectronicThinFilmsandIntegratedDevices,UniversityofElectronicScienceandTechnolo
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
In this work, we report a broadband terahertz wave modulator based on a top-gate graphene field effect transistor with polyimide as the gate dielectric on a PET substrate. The transmission of the terahertz wave is modulated by controlling the Fermi level of graphene via the polyimide as the top-gate dielectric material instead of the traditional dielectric materials. It is found that the terahertz modulator can achieve a modulation depth of ～20.9% with a small operating gate voltage of 3.5 V and a low insertion loss of 2.1 dB.
其他文献
A micro Fabry-Perot interferometer (M-FPI) is constructed by splicing a short section of polarization-maintaining photonic crystal fiber (PM-PCF) to an end-cleaved single-mode fiber with controllable offset. Due to the high effective optical path differen
带内相对光谱响应度是检测和评估偏振遥感器带内响应非一致性的基本参数。采用基于激光抽运氙灯光源的单色仪、消偏器、参考探测器和45°分束镜,搭建了一套偏振遥感器相对光谱响应度测量装置。该装置采用消偏器消除单色仪输出的偏振特性,通过光谱偏振分析仪(SPOLA)进行消偏精度的测量和验证。采用分束镜同步测量的方法来降低光源的非稳定性影响,提高测量精度和效率。采用成像区域大气校正仪490nm和870nm偏振通
We report the direct fabrication of a microfluidic chip composed of two high-aspect ratio microfluidic channels with lengths of 3.5 cm and 8 mm in a glass substrate by femtosecond laser micromachining. The fabrication mainly consists of two steps: 1) writ
A tunable single-longitudinal mode erbium-doped fiber ring laser based on stepper motor and closed loop control is proposed and demonstrated. The system consists of an erbium-doped fiber (EDF), a tunable fiber Bragg grating (FBG) filter and a wavelength d
We report the simulation results on the thickness uniformity of optical coatings deposited on spherical substrates by optimizing the geometric configuration parameters, such as tilting angle of the substrate holder and position of the evaporation source i
We report the first (to the best of our knowledge) tunable passively
本文报道有机杂环化合物(口恶)英(钅翁)掺杂高聚物PMMA薄膜的光学特征,在600～1000nm波长范围内,透射率为80～90%,材料折射率n=1.554,利用反向传播简并四波混频法测得该薄膜的非线性光学系数x(3)为10-10e.s.u.,并观测到后向泵浦束被延迟情况下,前向泵浦光束与探测光束形成光栅瞬态弛豫时间分辨曲线,它的弛豫时间为30ps.
激光主动清除空间碎片已经成为国际上的研究热点。碎片靶材在高能脉冲激光作用下的冲量耦合效应研究是实现碎片清除的基础和关键。基于单摆法模型的高速摄影测量法分别研究了ns和ms两种不同脉宽制式激光对铝合金小球的冲量耦合系数的变化规律, 并从机理上分析了两种制式激光产生冲量耦合系数特性的不同。重点指出ms激光能够产生的单位面积冲量远大于ns激光, 可用于清扫空间碎片。提出采用ns与ms的复合激光能够有效提高激光的能量利用率, 从而获得更大的冲量耦合系数。为激光清扫空间碎片的研究提供了一条新的思路, 具有很强的指导
针对监控视频中的多尺度近岸舰船检测问题,提出了一种基于特征重聚焦网络的舰船目标检测算法,设计了由多维特征聚合模块(MFAM)与注意力特征重构模块(AFRM)组成的特征重聚焦策略。其中,MFAM基于输入的特征金字塔构建特征聚合块,进一步融合多尺度舰船不同层次特征的语义信息。AFRM基于多分支空洞卷积以及通道与空间注意力机制提升网络对目标非局部信息的表征和对背景干扰的抑制,并构建了用于目标检测的特征重聚焦金字塔。在Seaships7000舰船公开数据集上的实验结果表明,相比其他算法,本算法对监控视频中多尺度近