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As a fundamental design criterion to obtain high quantum efficiency, ωp1 and ωL values are to be matched to ωp2 value while ωp3 is far depart from them. Once the device dimensions and material systems are designed, ωp1 and ωL become fixed parameters. ωp3 for the connecting portion, on the other hand, is controllable (by Vg2) so that one can set it at far higher or lower than ωp2 by making the connecting portion to be metallic or dielectric. When the grating gate is made with metals like standard HEMT’s, ωp1 becomes higher by orders of magnitude than ωp2, resulting in degrading the emission power/efficiency6, 21.
The lower curve is an original self-oscillation spectrum without optical excitation (not scaled vertically). 48 T. Otsuji et al. 4. Impulsive laser excited terahertz emission Electromagnetic response to impulsive photoexcitation was also measured at room temperature by using reflective electrooptic sampling7, 9. A 1550-nm, 1-mW, 70-fs laser pulse was used as pump and probe beams. When the sample was appropriately biased, as shown in Fig. 14(a), it emitted an impulsive radiation followed by monochromatic relaxation oscillation which was significantly enhanced by its vertical cavity structure.
Org). † The Late Marc Feldman was with the Electrical and Computer Engineering Department, University of Rochester, Rochester, NY 14627 USA. edu) 23 24 Q. Diduck, H. Irie & M. Margala 1. Introduction Since the introduction of the Bipolar Junction Transistor and Field Effect Transistor, little progress toward novel transistor designs has been achieved. Evolutionary changes in size and material compositions have provided better devices, however these are just improvements to a fundamentally similar structure.