公开(公告)号：US07376403B1

公开(公告)日：2008-05-20

申请号：US11113635

申请日：2005-04-25

申请人： Michael C. Wanke ,  S. James Allen ,  Mark Lee

发明人： Michael C. Wanke ,  S. James Allen ,  Mark Lee

IPC分类号： H04B1/18

CPC分类号： H03D7/125 ,  H01L29/205 ,  H01L29/7783

摘要： A terahertz radiation mixer comprises a heterodyned field-effect transistor (FET) having a high electron mobility heterostructure that provides a gatable two-dimensional electron gas in the channel region of the FET. The mixer can operate in either a broadband pinch-off mode or a narrowband resonant plasmon mode by changing a grating gate bias of the FET. The mixer can beat an RF signal frequency against a local oscillator frequency to generate an intermediate frequency difference signal in the microwave region. The mixer can have a low local oscillator power requirement and a large intermediate frequency bandwidth. The terahertz radiation mixer is particularly useful for terahertz applications requiring high resolution.

摘要翻译： 太赫兹辐射混合器包括具有高电子迁移率异质结构的外差场效应晶体管（FET），其在FET的沟道区域中提供可点缀的二维电子气。 混频器可以通过改变FET的栅极栅极偏置来工作在宽带夹断模式或窄带谐振等离子体激元模式。 混频器可以针对本地振荡器频率击败RF信号频率，以在微波区域中产生中频差信号。 混频器可以具有低本地振荡器功率要求和大的中频带宽。 太赫兹辐射混合器对于需要高分辨率的太赫兹应用特别有用。

公开(公告)号：US07420225B1

公开(公告)日：2008-09-02

申请号：US11290090

申请日：2005-11-30

申请人： Michael C. Wanke ,  Mark Lee ,  Eric A. Shaner ,  S. James Allen

发明人： Michael C. Wanke ,  Mark Lee ,  Eric A. Shaner ,  S. James Allen

IPC分类号： H01L31/0328 ,  H01L31/0336 ,  H01L31/072 ,  H01L31/109 ,  H01L29/06

CPC分类号： H01L31/119 ,  B82Y10/00 ,  H01L23/647 ,  H01L23/66 ,  H01L29/775 ,  H01L2924/0002 ,  H01L2924/19104 ,  H01L2924/00

摘要： A direct detector for terahertz radiation comprises a grating-gated field-effect transistor with one or more quantum wells that provide a two-dimensional electron gas in the channel region. The grating gate can be a split-grating gate having at least one finger that can be individually biased. Biasing an individual finger of the split-grating gate to near pinch-off greatly increases the detector's resonant response magnitude over prior QW FET detectors while maintaining frequency selectivity. The split-grating-gated QW FET shows a tunable resonant plasmon response to FIR radiation that makes possible an electrically sweepable spectrometer-on-a-chip with no moving mechanical optical parts. Further, the narrow spectral response and signal-to-noise are adequate for use of the split-grating-gated QW FET in a passive, multispectral terahertz imaging system. The detector can be operated in a photoconductive or a photovoltaic mode. Other embodiments include uniform front and back gates to independently vary the carrier densities in the channel region, a thinned substrate to increase bolometric responsivity, and a resistive shunt to connect the fingers of the grating gate in parallel and provide a uniform gate-channel voltage along the length of the channel to increase the responsivity and improve the spectral resolution.

摘要翻译： 用于太赫兹辐射的直接检测器包括具有一个或多个在通道区域中提供二维电子气的量子阱的光栅门控场效应晶体管。 光栅可以是具有至少一个可以单独偏置的手指的分割光栅门。 将分光栅门的单根手指偏压到接近夹点，大大增加了检测器的谐振响应幅度，超过了现有的QW FET检测器，同时保持了频率选择性。 分光栅门控QW FET显示对FIR辐射的可调谐共振等离子体响应，这使得可以在无可移动的机械光学部件上实现电扫描光谱仪。 此外，窄频谱响应和信噪比足以在无源多光谱太赫兹成像系统中使用分光栅门控QW FET。 检测器可以在光电导或光伏模式下工作。 其他实施例包括均匀的前门和后门，以独立地改变沟道区域中的载流子密度，减薄的衬底以增加测温响应性，以及电阻分流器，以并行连接光栅门的指状物，并沿着栅极通道电压提供均匀的栅极通道电压 通道的长度增加了响应度并提高了光谱分辨率。

公开(公告)号：US08198919B1

公开(公告)日：2012-06-12

申请号：US13033347

申请日：2011-02-23

申请人： Alexander Kozhanov ,  S. James Allen ,  Christopher Palmstrom

发明人： Alexander Kozhanov ,  S. James Allen ,  Christopher Palmstrom

IPC分类号： H03K19/20

CPC分类号： H03K19/20 ,  B82Y40/00 ,  H01F10/3254 ,  H01F10/3272 ,  H01F10/329 ,  H01F41/308 ,  H01L27/228 ,  H01L29/0665 ,  H01L29/82 ,  H01L43/08 ,  H03K19/16

摘要： A non-volatile logic gate, including a magnetic material having a shape induced magnetic anisotropy, wherein a shape of the magnetic material has a first vertex, a second vertex, and a third vertex and supports a single magnetic domain; regions of the magnetic material including a first input region adjacent the first vertex, a second input region adjacent the second vertex, and an output region adjacent a third vertex; the first input region for receiving a first logic input to the logic gate, the second input region for receiving a second logic input to the logic gate, and the output region for outputting at least one logic output of the logic gate; and the shape induced magnetic anisotropy determining at least part of a truth table for the logic gate, so that the logic gate produces the at least one logic output from the logic inputs using the shape.

摘要翻译： 一种非易失性逻辑门，包括具有形状感应磁各向异性的磁性材料，其中所述磁性材料的形状具有第一顶点，第二顶点和第三顶点，并且支撑单个磁畴; 磁性材料的区域包括与第一顶点相邻的第一输入区域，与第二顶点相邻的第二输入区域和与第三顶点相邻的输出区域; 用于接收到逻辑门的第一逻辑输入的第一输入区，用于接收逻辑门的第二逻辑输入的第二输入区和用于输出逻辑门的至少一个逻辑输出的输出区; 并且形状感应磁各向异性确定逻辑门的真值表的至少一部分，使得逻辑门使用该形状从逻辑输入产生至少一个逻辑输出。