Design and Fabrication of a 1 THz Backward Wave Amplifier

The THz frequency range represents a true challenge for designers, fabrication technologies and characterization systems. So far, huge technological obstacles have prohibited any system realization different from laboratory one. Furthermore, most of the applications in the THz frequency range require a level of power not achievable by optoelectronic devices at room temperature or by solid-state technology. The recent availability of three-dimensional simulators and high aspect ratio micro-fabrication techniques has stimulated a class of vacuum electron devices operating in the THz regime, to get a level of output power to enable applications at these frequencies. The OPTHER (Optically driven THz amplifier) project, funded by the European Community, is on the road to realize the first 1 THz vacuum tube amplifier. Technology at the state of the art has been used for the realization of the parts with dimensions supporting THz frequencies. A backward wave amplifier configuration is chosen to make the parts realizable. A carbon nanotube cold cathode has been considered for electron generation. A thermionic micro electron gun is designed to test the tube. A novel slow-wave structure (SWS), the double corrugated rectangular waveguide, is devised to support a cylindrical electron beam and to guarantee high interaction impedance with limited losses. Both LIGA and UV SU-8 photolithography have been tested to realize the SWS.

[1]  David Chernin,et al.  Design and fabrication of terahertz Extended Interaction Klystrons , 2010, 35th International Conference on Infrared, Millimeter, and Terahertz Waves.

[2]  F. Brunetti,et al.  Study of the Influence of Transverse Velocity on the Design of Cold Cathode-Based Electron Guns for Terahertz Devices , 2011, IEEE Transactions on Electron Devices.

[3]  Carlo Sirtori,et al.  Applied physics: Bridge for the terahertz gap , 2002, Nature.

[4]  Yvonne Lamoreaux,et al.  Principles of Electron Tubes , 1944 .

[5]  John H. Booske,et al.  Analysis of rectangular waveguide-gratings for amplifier applications , 1994 .

[6]  B. Levush,et al.  Intense Sheet Electron Beam Transport in a Uniform Solenoidal Magnetic Field , 2009, IEEE Transactions on Electron Devices.

[7]  Frank L. Krawczyk,et al.  Wideband RF Structure for Millimeter Wave TWTs , 2006 .

[8]  P. Legagneux,et al.  Carbon nanotube based cathodes for microwave amplifiers , 2009, 2009 IEEE International Vacuum Electronics Conference.

[9]  Claudio Paoloni,et al.  Double-Corrugated Rectangular Waveguide Slow-Wave Structure for Terahertz Vacuum Devices , 2010, IEEE Transactions on Electron Devices.

[11]  Ronald Albert Lawes.  Manufacturing tolerances for UV LIGA using SU-8 resist , 2005 .

[12]  S. A. Zaitsev,et al.  Traditional and novel vacuum electron devices , 2001 .

[13]  Diana Gamzina,et al.  Terahertz vacuum electronic circuits fabricated by UV lithographic molding and deep reactive ion etching , 2009 .

[14]  D. Gallagher,et al.  A compact, high power, 0.65 THz source , 2008, 2008 IEEE International Vacuum Electronics Conference.

[15]  J. Federici,et al.  THz imaging and sensing for security applications—explosives, weapons and drugs , 2005 .

[16]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[17]  Claudio Paoloni,et al.  Corrugated Rectangular Waveguide Tunable Backward Wave Oscillator for Terahertz Applications , 2010, IEEE Transactions on Electron Devices.

[18]  R. Ives,et al.  Microfabrication of high-frequency vacuum electron devices , 2004, IEEE Transactions on Plasma Science.

[19]  H. Heffner.  Analysis of the Backward-Wave Traveling-Wave Tube , 1954, Proceedings of the IRE.

[20]  N.C. Luhmann,et al.  Phase-Shifted Traveling-Wave-Tube Circuit for Ultrawideband High-Power Submillimeter-Wave Generation , 2009, IEEE Transactions on Electron Devices.

[21]  Gun-Sik Park,et al.  Experimental investigations on miniaturized high-frequency vacuum electron devices , 2005, IEEE Transactions on Plasma Science.

[22]  Zhaoyun Duan,et al.  Sine Waveguide for 0.22-THz Traveling-Wave Tube , 2011, IEEE Electron Device Letters.

[23]  D.R. Whaley,et al.  100 W Operation of a Cold Cathode TWT , 2009, IEEE Transactions on Electron Devices.

[24]  Robert J. Barker,et al.  Modern Microwave and Millimeter-Wave Power Electronics , 2005 .

[25]  D. van der Weide,et al.  Microfabricated W-band traveling wave tubes , 2005, 2005 Joint 30th International Conference on Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics.

[26]  Claudio Paoloni,et al.  Corrugated waveguide slow-wave structure for THz travelling wave tube , 2009, European Microwave Conference.

[27]  S. Xavier,et al.  7.1: TWT and X-Ray devices based on carbon nano-tubes , 2010, 2010 IEEE International Vacuum Electronics Conference (IVEC).

[28]  D. W. van der Weide,et al.  Folded waveguide traveling-wave tube sources for terahertz radiation , 2003, IEEE Transactions on Plasma Science.

[29]  Xuyuan Chen,et al.  Particle-in-Cell Simulation and Optimization for a 220-GHz Folded-Waveguide Traveling-Wave Tube , 2011, IEEE Transactions on Electron Devices.

[30]  R. Kompfner,et al.  Backward-Wave Tubes , 1953, Proceedings of the IRE.

[31]  J. Booske,et al.  Wave dispersion and growth analysis of low-voltage grating Cerenkov amplifiers , 1994 .

[32]  P. Siegel.  Terahertz Technology , 2001 .

[33]  Neville C. Luhmann,et al.  Strongly confined plasmonic wave propagation through an ultrawideband staggered double grating waveguide , 2008 .

[34]  N. C. Luhmann,et al.  Modeling Investigation of an Ultrawideband Terahertz Sheet Beam Traveling-Wave Tube Amplifier Circuit , 2011, IEEE Transactions on Electron Devices.

[35]  Herbert J. Reich,et al.  Principles of electron tubes , 1941 .

[36]  Gun-Sik Park,et al.  Microfabrication of millimeter wave vacuum electron devices by two-step deep-etch x-ray lithography , 2006 .

[37]  Viktor Krozer,et al.  Square helix TWT for THz frequencies , 2010, 35th International Conference on Infrared, Millimeter, and Terahertz Waves.

[38]  David R. Smith,et al.  User-configurable MAGIC for electromagnetic PIC calculations , 1995 .

[39]  Stepan Lucyszyn,et al.  Engineering Approach to Modelling Metal THz Structures , 2011 .

[40]  William Plowden.  The Compact , 2003 .

[41]  A. Hirata,et al.  Full-wave modal analysis of the rectangular waveguide grating , 2000 .