Microwave Phase Conjugation in Optomechanical Media

[931 . 1975 . feterman]将进行一项研究，在微波和毫米波频率下测试用于四个波混频实验的几种光力学介质。这些介质是空间固定的三维阵列，电各向异性粒子，与辐射波长相比很小。颗粒由扭转弹簧机械支撑在装有两个微铰链的刚性支撑架上，并且由于入射辐射施加的电致伸缩扭矩可以进行旋转。电致伸缩力矩使粒子以这种方式旋转，从而形成可以控制微波或毫米波辐射属性的定向折射率光栅。利用低频高功率泵浦光束和高频低功率探头进行双波混频实验，得到光力学介质的磁化率参数。四波混频实验将实现相位共轭，并评估光机械阵列高非线性特性的理论预测。这项工作的重点将是证明利用机械结构的取向特性作为主动元件在微波和毫米波频率的自由空间中实现相位共轭的可行性。结合微机械加工和毫米波器件的概念，提供了全新类型的器件和系统的可能性。这些将在未来的通信中有广泛的应用前景，电力传输和新型跟踪系统。​X´Z \ b ！​F 9 9 (Times New Roman Symbol & Arial " h 7 %7 % 1卡桑德拉·奎恩卡桑德拉·奎恩

9311975 Fetterman A study will be conducted to test at microwave and millimeter wave frequencies several optomechanical media for use in four wave mixing experiments. These media are three-dimensional arrays of spatially fixed, electrically anisotropic particles that are small compared to the radiation wavelength. The particles are mechanically supported by torsional spring on the rigid supporting frame mounted with two microhinges and can undergo rotation due to electrostrictive torques exerted by incident radiation. Electrostrictive torques rotate the particles in such a way as to form orientational index gratings which can control the attributes of microwave or millimeter wave radiation. The susceptibility parameters of the optomechanical media will be obtained from two- wave mixing experiments using low frequency high-power pump beams and high frequency low-power probes. Four-wave mixing experiment will be performed to achieve phase conjugation and to evaluate the theoretical predictions of high nonlinear properties of optomechanical arrays. The thrust of this effort will be to demonstrate the feasibility of using orientational properties of mechanical structures as active elements to achieve phase conjugation in free space at both microwave and millimeter wave frequencies. Combining the concepts of micromachining and millimeter wave devices offers the possibility of entirely new classes of devices and systems. These will have a broad range of possible applications in future communication, power transmission and novel tracking systems. X ı Z \ b ! F 9 9 ( Times New Roman Symbol & Arial " h 7 %7 % O 1 Cassandra Queen Cassandra Queen