Nanometer Polarization Control Devices and Coherent Detection

纳米偏振控制器件和相干检测

• 批准号: 11450139
• 负责人: MINAKATA Makoto
• 金额: $ 8.9万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450139/
• 关键词: Electron Beam Irradiation; Charge Distribution Model; Nanometer Scale Domain Inversion; Second Harmonic Generation; P-E Hysteresis Curve; Threshold of Domain Inversion; LiTaO_3; Interaction of Coulomb Force; LiTaO_3; 大容量高密度メモリ; LiNbO_3; 核形成しきい値

We Have been studying the formation of nanometer scale inversion domains in LiTaO_3 (LT) and LiNbO_3 (LN) using an electron beam (EB) irradiation and an external electric field applied method.In this study, we have been obtained the following results ;1) The Coulomb force caused by the electrons impinging into crystal by EB irradiation were measured. We led the equation for the interaction of Coulomb between a small dot and a surrounding ring (control-ring) which is drawn with various electronic densities before drawing of a small dot. Then we drawn the control-ring with same density and different size and compared the size of inverted pattern with the original designed one. There was good agreement with the pattern size as expected. It has been clear that the mechanism of LN and LT domain inversion corresponding to two method, and a few hundred nm inverted domain size has been successfully obtained by using the optical grade LN which where controlled suitable surface resistibility.2) The coherent detection for imaging domain inversion of nanometer scale has been proposed. This system is composed of AFM unit and Piezo-active and Lock-in amp. units.3) A high efficiency SHG blue light source was fabricated by using a new method called "Full Cover Electrode Method" of domain inversion.4) A new structure (Back slot type) and the optimum design for LN traveling wave optical modulator are proposed. Modulation speed 40 Gbps, and driving voltage 2.8V was achieved.

采用电子束辐照和外加电场法研究了LiTaO_3 （LT）和LiNbO_3 （LN）纳米级反转畴的形成。在本研究中，我们得到了以下结果：1)测量了电子束辐照下电子撞击晶体所产生的库仑力。在绘制小点之前，我们推导了小点与周围以不同电子密度绘制的环（控制环）之间的库仑相互作用方程。然后绘制出相同密度、不同尺寸的控制环，并与原设计的倒纹尺寸进行比较。与预期的模式大小一致。明确了两种方法对应的LN和LT畴反转机理，并通过控制合适表面电阻率的光学级LN成功获得了几百nm的反转畴尺寸。2)提出了用于纳米尺度成像域反演的相干检测方法。该系统由原子力显微镜单元、压电有源和锁相放大器单元组成。3)采用畴反转的“全覆盖电极法”制备了高效SHG蓝光光源。4)提出了一种新的光行波调制器结构（后槽式）和优化设计方法。调制速度为40 Gbps，驱动电压为2.8V。

项目成果

M.Minakata, et al.: "A study on Electric Field Distribution Calculated by the SOR-method"Proceedings of Joint Int. Conf. on Advanced Science and Technology. 110-115 (1999)

M.Minakata 等人：“通过 SOR 方法计算的电场分布的研究”联合国际会议录。

M.Minakata: "Effect of Control-Ring on LiTaO_3 Domain Inversion by Electron Beam Irradiation"Proceedings of Joint International Conference on Advanced Science and Technology. 4. 253-256 (2000)

M.Minakata：“电子束辐照控制环对LiTaO_3畴反转的影响”先进科学技术国际联合会议论文集。

M. Minakata: "Active and Passive Optical Components for WDM Communication"SPIE SERIES. 4532. 16-27 (2001)

M. Minakata：“用于 WDM 通信的有源和无源光学元件”SPIE 系列。

K. Ishikawa: "Size-induced Phase Transition in PdTiO3 Nanocrystals : Raman Scattering Study"Phys. Rev. B. 3125-3130 (2000)

K. Ishikawa：“PdTiO3 纳米晶体中尺寸诱导的相变：拉曼散射研究”Phys。

D.S.Fu, K.Ishikawa, M.Minakata, H.Suzuki: "Observation of Piezoelectric Relaxation in Ferroelectric Thin Films by Continuous Charge Integration"Jpn.J.Appl.Phis.. 40 Part 1 No.9B. 5683-5686 (2001)

D.S.Fu、K.Ishikawa、M.Minakata、H.Suzuki：“通过连续电荷积分观察铁电薄膜中的压电弛豫”Jpn.J.Appl.Phis.. 40 第 1 部分 No.9B。