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采用外加电场法制备了LiNbO3单晶周期畴结构. 在对不同尺寸周期畴的反转电流进行比较研究的基础上,提出了一种确定反转畴成核时间和纵向贯穿速率的方法. 根据这一方法,得到在电场强度为25.1kV/mm,脉冲宽度为50 ms的脉冲方波作用下,LiNbO3单晶反转畴的成核时间约为80ns,纵向贯穿速率约为0.1667m/s.
关键词:
3单晶周期极化')" href="#">LiNbO3单晶周期极化
反转电流
反转畴成核时间
反转畴纵向贯穿速率 相似文献
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采用电滞回线方法和偏置直流电场中叠加小交变电场方法研究了锆钛酸铅反铁电陶瓷材料在强电场作用下的介电行为.测量结果显示,锆钛酸铅反铁电材料的介电常数随外加电场强度呈非线性变化,在反铁电 铁电转变的电场区间形成介电峰.表征极化强度随电场强度变化率的微分介电常数εd峰值出现在反铁电 铁电转换电场强度处,最高达到41000.随着偏置电场增加反铁电向铁电体转变过程中,小信号介电常数εc减小;在电场降低铁电回复成反铁电过程中,小信号介电常数εc增大,小信号介电常数εc峰先于微分介电常数εd峰出现.根据电场作用下反铁电
关键词:
锆钛酸铅反铁电陶瓷
介电行为
强电场条件 相似文献
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Ultra-broadband and high-efficiency polarization conversion metasurface with multiple plasmon resonance modes 下载免费PDF全文
In this paper, we present a novel metasurface design that achieves a high-efficiency ultra-broadband cross polarization conversion. The metasurface is composed of an array of unit resonators, each of which combines an H-shaped structure and two rectangular metallic patches. Different plasmon resonance modes are excited in unit resonators and allow the polarization states to be manipulated. The bandwidth of the cross polarization converter is 82% of the central frequency,covering the range from 15.7 GHz to 37.5 GHz. The conversion efficiency of the innovative new design is higher than 90%.At 14.43 GHz and 40.95 GHz, the linearly polarized incident wave is converted into a circularly polarized wave. 相似文献
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