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Materials, Spectroscopy, Waveguides

192. Jojit C. Torcedo, Thomas M. Goyette, Andrew J. Gatesman, “Backscattering from a rough, high dielectric constant surface: an application for radar sensing of ocean clutter,” Proc. SPIE 10634, Passive and Active Millimeter-Wave Imaging XXI, 106340L, 8 May 2018; doi: 10.1117/12.2319606. pdf476KB

185. Richard J. Williams, Andrew J. Gatesman, Robert H. Giles, and William E. Nixon, "Phase Characteristics of Subwavelength Antenna Elements for Efficient Design of Terahertz Frequency and Millimeter Wave Metasurfaces," in Terahertz Physics, Devices, and System IX: Advanced Applications in Industry and Defense: Advanced Materials and Devices, Proceedings of SPIE Vol. 9483 (SPIE, Baltimore, MD, 2015). pdf 2.6MB

181. Richard J. Williams, "Frequency Selective Terahertz Retroreflectors," M.S. Thesis, Department of Physics and Applied Physics, University of Massachusetts Lowell, USA, 2014. pdf 2.9MB

180. D. A. DiGiovanni, Andrew J. Gatesman, T. M. Goyette, R. H. Giles, "Surface and Volumetric Backscattering Between 100 GHz and 1.6 THz," in Passive and Active Millimeter-Wave Imaging XVII, edited by David A. Wilkner, Arttu R. Luukanen, Proceedings of SPIE Vol. 9078 (SPIE, Bellingham, WA, 2014) 90780A. pdf 6.0MB

179. Richard J. Williams, Andrew J. Gatesman, Thomas M. Goyette, and Robert H. Giles, "Radar Cross Section Measurements of Frequency Selective Terahertz Retroreflectors," in Terahertz Physics, Devices, and System VIII: Advanced Applications in Industry and Defense​, edited by Mehdi F. Anwar, Thomas W. Crowe, Tariq Manzur, Proceedings of SPIE Vol. 9102 (SPIE, Baltimore, MD, 2014) 91020R. pdf 1.1MB

174. Pallavi Doradla, Robert H. Giles, "Dual-frequency Characterization of Bending Loss in Hollow Flexible Terahertz Waveguides," Proc. SPIE 8985, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII, 898518 (March 7, 2014); doi: 10.1117/12.2038596. pdf 4.5MB

173. D. A. DiGiovanni, A. J. Gatesman, R. H. Giles, W. E. Nixon, "Backscattering of Ground Terrain and Building Materials at Millimeter-Wave and Terahertz Frequencies," in Passive and Active Millimeter-Wave Imaging XVI, edited by David A. Wikner, Arttu R. Luukanen, Proceedings of SPIE Vol. 8715, June 2013. pdf 1.6MB

168. Pallavi Doradla, Cecil S. Joseph, Jayant Kumar, and Robert H. Giles, "Characterization of bending loss in hollow flexible terahertz waveguides," Optics Express, Vol. 20, No. 17, pp. 19176-19184 (2012). pdf 1.4MB

166. Doradla, P., Joseph, C. S., Kumar, J., Giles, R. H., "Propagation Loss Optimization in Metal/Dielectric Coated Hollow Flexible Terahertz Waveguides," in Terahertz Technology and Applications V, edited by Laurence P. Sadwick, Créidhe M. O'Sullivan, Proceedings of SPIE Vol. 8261 (SPIE, Bellingham, WA 2012) 82610P, January 2012. pdf 800KB

160. James M. Cramer, “Dielectric Resonator Fabrication and Assembly Methods for Terahertz Metamaterials,” Ph.D. dissertation, Dept. of Physics and Applied Physics, University of Massachusetts Lowell, USA, 2011. pdf 8.8MB

157. A. Jagannathan, A. J. Gatesman; T. Horgan, T. Goyette, M. Coulombe, R. H. Giles, and W. E. Nixon, "Effect of periodic roughness and surface defects on the terahertz scattering behavior of cylindrical objects," SPIE Proceedings Vol. 7671 Terahertz Physics, Devices, and Systems IV, Mehdi Anwar, Nibir K. Dhar, Thomas W. Crowe, Editors, 26 April 2010. pdf 4.7MB

156. A. Jagannathan, A. J. Gatesman, and R. H. Giles, "Characterization of roughness parameters of metallic surfaces using terahertz reflection spectra," Optics Letters, Vol. 34, No. 13, pg. 1927, July 1, 2009. pdf 270KB

147. E. J. Ehasz, T. M. Goyette, R. H. Giles and W. E. Nixon, "High Resolution Frequency Measurements of Far-Infrared Laser Lines," IEEE Journal of Quantum Electronics, vol. 46, no. 4, pp. 474-477, April 2010. pdf 330KB

144. Chiayun Wu, Andrew J. Gatesman, Lucille M. DeRoeck, Thomas M. Horgan, Robert H. Giles, William E. Nixon, "Terahertz backscattering behavior of various absorbing materials," in Terahertz Physics, Devices, and Systems III: Advanced Applications in Industry and Defense, edited by Mehdi Anwar; Nibir K. Dhar; Thomas W. Crowe, Proceedings of SPIE Vol. 7311 (SPIE, Bellingham, WA 2009) 73110M. pdf 10MB

135. Andriy A. Danylov, Jerry Waldman, Thomas M. Goyette, Andrew J. Gatesman, Robert H. Giles, Kurt J. Linden, William R. Neal, William E. Nixon, Michael C. Wanke, and John L. Reno, "Transformation of the multimode terahertz quantum cascade laser beam into a Gaussian, using a hollow dielectric waveguide," Applied Optics, Volume 46, Issue 22, pp. 5051-5055. pdf 1.4MB

131. Andrew J. Gatesman, Andriy Danylov, Thomas M. Goyette, Jason C. Dickinson, Robert H. Giles, William Goodhue, Jerry Waldman, William E. Nixon, and Weber Hoen, "Terahertz Behavior of Optical Components and Common Materials," in Terahertz for Military and Security Applications IV, edited by Dwight L. Woolard, R. Jennifer Hwu, Mark J. Rosker, James O. Jensen, Proceedings of the SPIE Vol 6212 (SPIE, Bellingham, WA, 2006), 62120E. May 2006. pdf 1.2MB

128. A.J. Gatesman, T.M. Goyette, J.C. Dickinson, R.H. Giles, J. Waldman, J. Sizemore, R.M. Chase, W.E. Nixon, "Polarimetric Backscattering Behavior of Ground Clutter at X, Ka, and W-band," Proc. SPIE Vol. 5808, p. 428-439, Algorithms for Synthetic Aperture Radar Imagery XII; Edmund G. Zelnio, Frederick D. Garber; Eds. May 2005. pdf 700KB

124. Tatiana Globus, Ramakrishnan Parthasarathy, Tatyana Khromova, Dwight L. Woolard, Nathan Swami, Andrew J. Gatesman, Jerry Waldman, "Optical characteristics of biological molecules in the Terahertz gap," Proc. SPIE Vol. 5584, p. 1-10, Chemical and Biological Standoff Detection II; James O. Jensen, Jean-Marc Theriault; Eds. Dec 2004. pdf 844KB

113. Christopher J. Beaudoin, Andrew J. Gatesman, Robert H. Giles, Jerry Waldman, Markus E. Testorf, Michael A. Fiddy, William E. Nixon, "Foliage penetrating radar imaging system," Proc. SPIE Vol. 4792, p. 173-184, Image Reconstruction from Incomplete Data II; Philip J. Bones, Michael A. Fiddy, Rick P. Millane; Eds. December 2002. pdf 614KB

109. A. J. Gatesman, C. Beaudoin, R. H. Giles, J. Waldman, W. E. Nixon, "VHF/UHF Imagery and RCS Measurements of Ground Targets in Forested Terrain," Proc. SPIE Vol. 4727, p. 80-90, Algorithms for Synthetic Aperture Radar Imagery IX; Edmund G. Zelnio; Ed. August 2002. pdf 2MB

106. A.J. Gatesman, M. Testorf, C. Beaudoin, M. Fiddy, R. Giles, J. Waldman, K. Ding, J. Poirier, W.E. Nixon, "VHF/UHF Radar Signatures of Foliage-Obscured Threat Military Vehicles," Invited Poster. CCC&D FOPEN Workshop, MIT Lincoln Laboratory, November 2001. pdf 7MB

104. A. J. Gatesman, T. M. Goyette, J. C. Dickinson, J. Waldman, J. Neilson, W. E. Nixon, "Physical scale modeling the millimeter-wave backscattering behavior of ground clutter," Proc. SPIE Vol. 4370, p. 141-151, Targets and Backgrounds VII: Characterization and Representation; Wendell R. Watkins, Dieter Clement, William R. Reynolds; Eds. September 2001. pdf 2.1MB

96. J.D. Kekis, M. Testorf, M.A. Fiddy, R.H. Giles, "Detecting 1/10th Scaled Structures in Dielectric Media Using Monostatic X-Band Radar Scattering Measurements," Proc. SPIE Vol. 4123, p. 13-24, Image Reconstruction from Incomplete Data; Michael A. Fiddy, Rick P. Millane; Eds. November 2000. pdf 932KB

94. W.A. Bailey, A.J. Gatesman, K.R. Gringas, W.D. Goodhue, "Fabrication and optimization of uniform output couplers for far-infrared lasers," Optics Letters, Vol 25, No. 18, pg. 1349, September 15, 2000. pdf 98.5KB

90. A.J. Gatesman, J. Waldman, M. Ji, C. Musante, S. Yngvesson, "An Anti-Reflection Coating for Silicon Optics at Terahertz Frequencies," Microwave and Guided Wave Letters, IEEE [see also IEEE Microwave and Wireless Components Letters] Volume: 10 Issue: 7 Jul 2000 Page(s): 264-266. pdf 76KB

81. A. J. Gatesman, J.Dickinson, T. Goyette,M. J. Coulombe, T.Horgan,R. H. Giles, and J. Waldman, "Physical Modeling of Lo Ships and Composite Structures/Materials," EM/RF/IR Ship and Submarine Signatures Control Workshop, Naval Research Labroratory, Washington D.C.,28 May 1998.

80. E. S. Jacobs, J. Waldman and W. D. Goodhue, "77K far-infrared hot-electron multi-quantum-well detectors," Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures -- May 1998 -- Volume 16, Issue 3, pp. 1430-1434. pdf 88KB

75. K. Bober, R. H. Giles and J. Waldman, "Tailoring The Microwave Permittivity And Permeability Of Composite Materials," International Journal of Infrared and Millimeter Waves, 18, 101, 1997. pdf 260KB

73. A. J. Gatesman, M. J. Coulombe, R. H. Giles, W. Goodhue, T. Horgan, J. Waldman, W. E. Nixon and K. Wilson, "Scale Model Radar Cross Section Measurements of the Navy's Advanced Enclosed Mast/Sensor System," Proceedings of the 1997 HAVE FORUM Low Observable Symposium, Fort Walton Beach, Florida, 8-10 April 1997.

67. R.H. Giles, "Characterization of Material Properties at Terahertz Frequencies," Proceedings of the NIST Terahertz Technology Workshop ,V9, 698 (1995). pdf 975KB

64. E.R. Mueller, D.M. Larsen, W.D. Goodhue, J. Waldman, "Band nonparabolicity and central-cell corrections for D- centers in GaAs quantum wells," Phys. Rev. B 51, 2326-2333 (1995) [Issue 4 - 15 January 1995]. pdf 1.2MB

61. D.W. Poterfield, J.L. Hesler, R. Densing, E.R. Mueller, T.W. Crowe, R.M. Weikle II, "Resonant metal-mesh bandpass filters for the far infrared," Applied Optics, Volume 33, Issue 25, pp. 6046-6052 September 1994. pdf 1.1MB

59. E.R. Mueller, D.M. Larsen, J. Waldman, and W.D. Goodhue, "Effects of band nonparabolicity and central-cell corrections on the spectrum of Si donors in GaAs quantum wells," Physical Review. B , 49 (19), 13475 (1994). pdf 1.1MB

54. W.D. Goodhue, E.R. Mueller, D.M. Larsen, J. Waldman, Y.H. Chai, S.C. Lia, and G.D. Johnson, "Quantum well GaAs/AlGaAs shallow-donor far-infrared photoconductors grown by molecular-beam epitaxy," Journal of Vacuum Science and Technology , Vol. 11, No. 3 pp 941-944,.May/June 1993. pdf 354KB

53. A.J. Gatesman, R.H. Giles, J. Waldman, "Submillimeter Optical Properties of Hexagonal Boron Nitride," Journal of Applied Physics, 4/15/93, Vol. 73 Issue 8, p3962. pdf 130KB

52. R.H. Giles, A.J. Gatesman, J. Fitz-Gerald, S. Fisk, J. Waldman, "Tailoring Artificial Dielectric Materials at Terahertz Frequencies," The Fourth International Symposium on Space Terahertz Technology , April 1993, Los Angeles, CA. pdf 130KB

50. C.E. Hawkins, R. Densing, T.J. Scholz, and A.J. Gatesman, "Strip Grating Output Couplers for Far Infrared Lasers," Proc. of the 17th Int. Conf. on Infrared and Millimeter Waves , Dec. 1992, Los Angeles, CA. pdf 2.3MB

49. A.J. Gatesman, R.H. Giles, and J. Waldman, "A High Precision Reflectometer for the Study of Optical Properties of Materials in the Submillimeter," Proc. of the 17th Int. Conf. on Infrared and Millimeter Waves , Dec. 1992, Los Angeles, CA. pdf 65KB

48. D.R. Cohn, S.C. Han, P.P. Woskov, B.L. Zhou, A. Ferdinand, R.H. Giles, J. Waldman, D.W. Cooke and R.E. Muenchausen, "Precision Submillimeter Wave Laser Reflection Measurements of High-Temperature Superconductors," Journal of Superconductivity. Vol. 5, No.4, 1992 p.389-393. pdf 7.5MB

47. R.H. Giles, T.M. Horgan, and J. Waldman, "Silicone-Based Anechoics at Terahertz Frequencies," Proc. of the 17th Int. Conf. on Infrared and Millimeter Waves, Dec. 1992, Los Angeles, CA. pdf 3.5MB

45. R. Densing, A. Erstiling, M. Gogolewski, H.P. Gemund, G. Lundershausen, A. Gatesman, "Effective Far Infrared Laser Operation with Mesh Couplers," Infrared Physics Volume 33, Issue 3 , 1992, Pages 219-226. pdf 10.7MB

44. J. Waldman, D.B. Moix, D.P. Scherrer, F.K. Kneubuhl, W.D. Goodhue, E.R. Mueller, M.J. Coulombe, "Multiquantum-Well Detection of Nanosecond Far-Infrared Superradiant Pulses at Temperatures above 77K," Infrared Physics Volume 33, Issue 6 , November 1992, Pages 487-491.

43. A.J. Gatesman, R.H. Giles, and J. Waldman, "Submillimeter Optical Properties of Hexagonal Boron Nitride," Proc. of MRS Society , 242, 623 (1992). pdf 130KB

40. Z. Fried, G.C. Phillips, and J. Waldman, "Laboratory measurements of scattered electromagnetic radiation from two-dimensional metallic and dielectric rough surfaces," JOSA B, Volume 9, Issue 5, 698- May 1992. pdf 1.3MB

39. E.R. Mueller, D.M. Larsen, J. Waldman, and W.D. Goodhue, "Definitive Identification of D- Centers in GaAs Quantum Wells by Tilt-Induced Line Splitting in a Magnetic Field," Phys. Rev. Lett. 68, 2204-2207 (1992) [Issue 14 - 6 April 1992]. pdf 625KB

38. E.R. Mueller, W.D. Goodhue, D.M. Larsen, J.W. Bales, and J. Waldman, "Magneto-optical study of donor-level crossing in tipped GaAs/(Ga,Al)As quantum wells," Phys. Rev. B 44, 1754-1761 (1991) [Issue 4 - 15 July 1991]. pdf 1.3MB

37. G.C. Phillips, R. Suresh, J.I. Chen, J. Waldman, J. Kumar, J.C. Huang, "Dielectric properties of polypyrrole doped with tosylate anion in the far infrared and microwave," Journal of Applied Physics, 1/15/91, Vol. 69 Issue 2, p899. pdf 696KB

36. A.J. Gatesman, R. H. Giles, J. Waldman, University of Lowell, L.P. Bourget, R.S. Post, ASTEX, "Optical properties of polycrystalline diamond films in the far-infrared," Proc. SPIE Vol. 1325, p. 170-177, Diamond Optics III; Albert Feldman, Sandor Holly; Eds. December 1990. pdf 65KB

35. R.H. Giles, A.J. Gatesman, A.P. Ferdinand, and J. Waldman, University of Lowell, "Design and fabrication of narrow band radar absorbing materials at terahertz frequencies," IEEE Proceedings from the 15th International Conference on Infrared and Millimeter Waves , Orlando, FL, Dec. 1990. pdf 65KB

34. A.J. Gatesman, R.H. Giles, and J. Waldman, University of Lowell, "FTIR Spectroscopy of CVD and Natural Diamond," IEEE Proceedings from the 15th International Conference on Infrared and Millimeter Waves , Orlando, FL, December 1990.

33. P.P. Woskov, D.R. Cohn, S.C. Han, Xsirius Superconductivity Inc., and R.H. Giles, J. Waldman, University of Lowell, "Precision Submillimeter-Wave Laser Reflectometry of Metals and Superconductors," IEEE Proceedings from the 15th International Conference on Infrared and Millimeter Waves , Orlando, FL, December 1990.

32. G.C. Phillips, R. Suresh, J.I. Chen, J. Waldman, J. Kumar, J.C. Huang, "Infrared Dielectric Behaviour of Polypyrrole Doped with Tosylate," Solid State Communications Volume 76, Issue 7 , November 1990, Pages 963-966. pdf 9MB

31. R.H. Giles, A.J. Gatesman, and J. Waldman, "A Study of the Far-infrared Optical Properties of Rexolite™," International Journal of Infrared and Millimeter Waves , 11, 1299 (1990). pdf 65KB

30. G.C. Phillips, Z. Fried, J. Waldman, "Non-Specular Scattering from Roughened Aluminum Surfaces," Proceedings of the 1990 URSI Radio Science Meeting , May 1990, Dallas, TX, pg. 110.

29. A.J. Gatesman, R.H. Giles, G. Phillips, J. Waldman, University of Lowell, L.P. Bourget, R.S. Post, ASTEX, "Far-Infrared Spectroscopic Study of Diamond Films," Proc. of MRS Society , 162, 185 (1989). pdf 65KB

28. R.H. Giles, A.P. Ferdinand, M.J. Coulombe, J. Waldman, ULRF and W. Nixon, W. Reinhold, AFSTC, "Submillimeter Wavelength Modeling of Dielectric Materials in Polarimetric Radar Approaches," Proceedings of the NATO Advanced Research Workshop on Direct and Inverse Methods in Radar Polarimetry , Bad Windsheim, Federal Republic of Germany, September 1988. pdf 65KB

27. R.H. Giles, A.P. Ferdinand, M.J. Coulombe, J. Waldman, ULRF and W. Nixon, W. Reinhold, AFSTC, "Submillimeter Polarimetric Modeling Applied to Dielectric Materials," Proceedings of the Polarimetric Technology Workshop , Huntsville, AL, August 1988.

26. G.C. Phillips, R.H. Giles, S.K. Tripathy, J. Waldman, "The Far Infrared Dielectric Properties of Conducting Polymers," 12th Annual IEEE Conference on Infrared and Millimeter Waves , Orlando, FL, December 1987, Conference Digest pg. 132.

23. R.H. Giles, and M.J. Coulombe, "Design of a Submillimeter Ellipsometer for the Measurement of Complex Indices of Refraction of Materials," IEEE Proceedings from the 10th International Conference on Infrared and Millimeter Waves , Orlando, FL, December 1985. pdf 400KB

21. H. Dave, R.W. Stimets, and J. Waldman, "An Investigation of CaF2:DY2+ System to Determine Its Potential A Continuously Tunable Far-Infrared Laser," Infrared Physics Volume 22, Issue 1 , January 1982, Pages 51-56.

16. J. Waldman, R.W. Stimets, S. Zopey Madan, and T.S. Chang, "Magnetospectroscopy of CaF2:DY2+ in the Submillimeter," Infrared Physics Volume 18, Issue 2 , March 1978, Pages 141-146.

13. S.M. Wolfe, K.J. Button, J. Waldman, and D.R. Cohn, "Modulated submillimeter laser interferometer system for plasma density measurements," Applied Optics, Volume 15, Issue 11, 2645- November 1976. pdf 788KB

12. C.W. Litton, K.J. Button, J. Waldman, D.R. Cohn, and B. Lax, "Verification of polaron cyclotron-resonance theory and determination of the coupling constant in n-CdTe," Phys. Rev. B 13, 5392-5396 (1976) [Issue 12 - 15 June 1976]. pdf 862KB

11. J. Waldman, T.S. Chang, H.R. Fetterman, C.M. Wolfe, and G.E. Stillman, "Recombination Radiation from Landau States in Impact Ionized GaAs," Solid State Communications, Volume 15, Issue 8, 15 October 1974, Pages 1309-1312. pdf 4.8MB

10. R.W. Stimets, J. Waldman, J. Lin, T.S. Chang, R.J. Temkin, and G.A.N. Connell, "Photon Spectra of Amorphous GaAs and Ge," Proceedings of the 5th International Conference on Amorphous Semiconductors, Pergamon Press (1974).

9. J. Waldman, T.S. Chang H.R. Fetterman, G.E. Stillman, C.M. Wolfe, "Tunable Far Infrared Luminescence from Landau States in n-GaAs," Solid State Communications 15, 1309 (1974).

8. R.W. Stimets, J. Waldman, J. Lin, T.S. Chang, R.J. Temkin, and G.A.N. Connell, "Far Infrared Absorption of Amorphous GaAs and Ge," Solid State Communications Volume 13, Issue 9 , 1 November 1973, Pages 1485-1489. pdf 10.5MB

7. H.R. Fetterman, J. Waldman, C.M. Wolfe, G.E. Stillman, and C.D. Parker, "Identification of donor species in high-purity GaAs using optically pumped submillimeter lasers," Applied Physics Letters; November 1, 1972; Volume 21, Issue 9, pp. 434-436. pdf 291KB

6. H.R. Fetterman, H.R. Schlossberg, and J. Waldman, "Submillimeter Spectroscopy," Laser Focus 8, 42 September 1972.

5. H.R. Fetterman, J. Waldman, and C.M. Wolfe, "Compositional Dependence of Effective Masses in n-type GaxIn1-xAs Alloys Using Submillimeter Cyclotron Resonance," Solid State Communications Volume 11, Issue 2 , July 1972, Pages 375-379. pdf 9.9MB

3. H.R. Fetterman, D.M. Larsen, G.E. Stillman, P.E. Tannenwald, and J. Waldman, "Field-Dependent Central-Cell Corrections in GaAs by Laser Spectroscopy," Physical Review Letters 26, 975 (1971). pdf 833KB

2. I. Melngailis, G.E. Stillman, J.O. Dimmock, C.M. Wolfe, "Far-Infrared Recombination Radiation from Impact-Ionized Shallow Donors in GaAs," Physical Review Letters Volume 23 No. 19 November 10, 1969. pdf 712KB

1. J. Waldman, D.M. Larsen, P.E. Tannenwald, C.C. Bradley, D.R. Cohn, and B. Lax, "Polaron Cyclotron Resonance in CdTe," Physical Review Letters 23, 1033 (1969). pdf 846KB