Vladimir Shalaev

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Vladimir M. Shalaev
Born (1957-02-18) February 18, 1957 (age 67)
CitizenshipUnited States
Alma materKrasnoyarsk State University, Russia
Scientific career
Fields
InstitutionsPurdue University
Websiteengineering.purdue.edu/~shalaev/

Vladimir (Vlad) M. Shalaev (born February 18, 1957) is a Distinguished Professor of Electrical and Computer Engineering[1] and Scientific Director for Nanophotonics at Birck Nanotechnology Center,[2] Purdue University.

Education and career[edit]

Shalaev earned a Master of Science Degree in physics (summa com laude) in 1979 from Krasnoyarsk State University (Russia) and a PhD Degree in physics and mathematics in 1983 from the same university. Shalaev received several awards for his research in the fields of nanophotonics and metamaterials, including the Max Born Award of the Optical Society of America (OSA),[3] the Willis E. Lamb Award for Laser Science and Quantum Optics,[4] Institute of Electrical and Electronics Engineers (IEEE) Photonics Society William Streifer Scientific Achievement Award,[5] the Rolf Landauer Medal of the Electrical, Transport and Optical Properties of Inhomogeneous Media (ETOPIM) International Association,[6] the UNESCO Medal for the development of nanosciences and nanotechnologies,[7] OSA and SPIE - The International Society for Optics and Photonics - Goodman Book Writing Award,[8] the 2020 Frank Isakson Prize for Optical Effects in Solids.[9] Shalaev is a Fellow of the OSA,[10] IEEE,[11] SPIE,[12] American Physical Society (APS),[13] and Materials Research Society (MRS).[14] Prof. Shalaev has co-/written three- and co-/edited four books, and authored over 800 research publications, in total.[15] As of January 2024, his h-index is 123 with the total number of citations nearing 70,000, according to Google Scholar.[16] In 2017-2023 Prof. Shalaev has been on the list of Highly Cited Researchers from the Web of Science Group;[17] he is ranked #9 in the optics category of the Stanford list of top 2% World's highest-cited scientists[18] (career-long; out of 64,044 entries).

Research[edit]

Vladimir M. Shalaev is recognized for his pioneering studies on linear and nonlinear optics of random nanophotonic composites that had helped to mold the research area of composite optical media.[4] He also contributed to the emergence of a new field of engineered, artificial materials - optical metamaterials.[3][4] Currently, he studies new phenomena resulting from merging metamaterials and plasmonics with quantum nanophotonics.[19]

Optical metamaterials[edit]

Optical metamaterials (MMs) are rationally designed composite nanostructured materials that exhibit unique electromagnetic properties drastically different from the properties of their constituent material components. Metamaterials offer remarkable tailorability of their electromagnetic response via shape, size, composition and morphology of their nanoscale building blocks sometimes called 'meta-atoms'.[20] Shalaev proposed and demonstrated the first optical MM that exhibits negative index of refraction and the nanostructures that show artificial magnetism across the entire visible spectrum.[21][22][23][24] (Here and thereafter, only selected, representative papers by Shalaev are cited; for complete list of Shalaev's publications visit his website.[25]) He made important contributions to active, nonlinear and tunable metamaterials, which enable new ways of controlling light and accessing new regimes of enhanced light-matter interactions.[26][27][28][29] Shalaev also experimentally realized negative-refractive-index MMs where optical gain medium is used to compensate for light absorption (optical loss).[28] He made significant contributions to the so-called Transformation Optics,[30] specifically on optical concentrators and "invisibility cloaks".[31][32][33][34] In collaboration with Noginov, Shalaev demonstrated the smallest, 40-nm, nanolaser operating in the visible spectral range.[35][36] Shalaev also made seminal contributions to two dimensional, flat metamaterials – metasurfaces[37] – that introduce abrupt changes to the phase of light at a single interface via coupling to nanoscale optical antennas.[38][39][40][41][42] He realized extremely compact flat lens,[40] ultra-thin hologram[41] and record-small circular dichroism spectrometer[42] compatible with planar optical circuitry. MM designs developed by Shalaev are now broadly employed for research in sub-wavelength optical imaging, nanoscale lasers, and novel sensors.[37][43]

Shalaev’s work had a strong impact on the whole field of metamaterials.[3][4][5] Three of Shalaev’s papers - Refs. [21], [22], and [31] - remain among the top 50 most-cited out of over 750,000 papers included in the ISI Web of Science OPTICS category since 2005 (as of January 2021).[44]

Random composites[edit]

Shalaev made pioneering contributions to the area of random optical media, including fractal and percolation composites.[4][45][46][47][48][49][50][51][52][53][54][55] He predicted the highly localized optical modes -'hot spots' - for fractals and percolating films which were later experimentally demonstrated by Shalaev in collaboration with the Moskovits and Boccara groups.[51][52] Furthermore, he showed that the hot spots in fractal and percolation random composites are related to localization of surface plasmons.[45][55] These localized surface plasmon modes in random systems are sometimes referred to as  Shalaev's "hot spots": see e.g.[56] This research on random composites stemmed from the early studies on fractals performed by Shalaev in collaboration with M. I. Stockman;[57][58][59][60][61][62] a theory of random metal-dielectric films was worked out in collaboration with A. K. Sarychev.[46][48][49][53] Shalaev also developed fundamental theories of surface-enhanced Raman scattering (SERS) and strongly-enhanced optical nonlinearities in fractals and percolation systems and led experimental studies aimed to verify the developed theories.[45][55][59][63][64] Shalaev also predicted that nonlinear phenomena in random systems can be enhanced not only because of the high local fields in hot spots but also due to the rapid, nanoscale spatial variation of these fields in the vicinity of hot spots, which serves as a source of additional momentum and thus enables indirect electronic transitions.[64]

Shalaev’s contributions to the optics and plasmonics of random media[45][55] helped to transform those concepts into the area of optical metamaterials.[21][24][26][35] Owing to the theory and experimental approaches developed in the area of random composites, optical metamaterials have quickly become a mature research field surprisingly rich in new physics.[23][6] Shalaev’s impact on the development of both fields is in identifying the strong synergy and close connection between these two frontier fields of optics that unlock an entirely new set of physical properties.[6]

New Materials for Nanophotonics and Plasmonics[edit]

Random composites and metamaterials provide a unique opportunity to tailor their optical properties via shape, size and composition of their nanoscale building blocks, which often require metals to confine light down to the nanometer scale via the excitation of surface plasmons.[45][29] To enable practical applications of plasmonics, Shalaev in collaboration with A. Boltasseva[65] developed novel plasmonic materials, namely transition metal nitrides and transparent conducting oxides (TCOs), paving the way to durable, low-loss, and CMOS-compatible plasmonic and nanophotonic devices.[66][67][68][69][70][71][72] The proposed plasmonic ceramics operating at high temperatures, can offer solutions to highly efficient energy conversion, photocatalysis and data storage technologies[68].[72] In collaboration with the Faccio group,[73] Shalaev demonstrated ultrafast, strongly-enhanced nonlinear responses in TCOs that possess an extremely low (close to zero) linear refractive index – the so-called epsilon-near-zero regime.[74][75][76][77][78] Independently, the Boyd group obtained equally remarkable results in a TCO material,[79] demonstrating that low-index TCOs hold a promise for novel nonlinear optics.

Early research[edit]

Shalaev’s PhD work (supervised by Prof. A.K. Popov) and early research involved theoretical analysis of resonant interaction of laser radiation with gaseous media, in particular i) Doppler-free multi-photon processes in strong optical fields and their applications in nonlinear optics[80] spectroscopy[81] and laser physics[82] as well as ii) the (newly-discovered then) phenomenon of light-induced drift of gases.[83][84]

Awards, honors, memberships[edit]

Publications[edit]

Prof. Shalaev co-/authored three-[23][47][49] and co-/edited four[85][86][87][88] books in the area of his scientific expertise. According to Shalaev's website,[89] over the course of his career he contributed 30 invited chapters to various scientific anthologies and published a number of invited review articles, over 800 publications in total. He made over 500 invited presentations at International Conferences and leading research centers, including a number of plenary and keynote talks.[90][91]

References[edit]

  1. ^ People, School of Electrical and Computer Engineering, Purdue University
  2. ^ Birck Nanotechnology Center Faculty
  3. ^ a b c d 2010 Optical Society of America Max Born Award
  4. ^ a b c d e f 2010 Willis E. Lamb Award for Laser Science and Quantum Optics
  5. ^ a b c 2015 IEEE Photonics Society William Streifer Scientific Achievement Award
  6. ^ a b c d 2015 Rolf Landauer International ETOPIM Association Medal
  7. ^ a b 2012 UNESCO Medal for the Development of Nanosciences and Nanotechnologies
  8. ^ a b 2014 Joseph W. Goodman Book Writing Award
  9. ^ a b 2020 Frank Isakson Prize for Optical Effects in Solids
  10. ^ a b 2003 OSA Fellows
  11. ^ a b IEEE Fellows Directory
  12. ^ a b Complete List of SPIE Fellows
  13. ^ a b APS Fellow Archive
  14. ^ a b List of MRS Fellows
  15. ^ V. Shalaev's publication list
  16. ^ Shalaev h-index and citations, Google Scholar
  17. ^ a b V. Shalaev - webofscience.com
  18. ^ a b "Updated science-wide author databases of standardized citation indicators, September 2022"
  19. ^ S. I. Bogdanov, A. Boltasseva, V. M. Shalaev, Overcoming quantum decoherence with plasmonics, Science, v. 364, no. 6440, pp. 532-533 (2019)
  20. ^ N. Meinzer, W.L. Barnes & I.R. Hooper, Plasmonic meta-atoms and metasurfaces, N. Meinzer, William L. Barnes & I.R. Hooper, Nature Photonics, v. 8, pp. 889–898 (2014)
  21. ^ a b c V.M. Shalaev, Optical Negative-Index Metamaterials, Nature photonics, v. 1, pp. 41–48 (2007)
  22. ^ a b V.M. Shalaev, W. Cai, U.K. Chettiar, H.-K. Yuan, A.K. Sarychev, V.P. Drachev, and A.V. Kildishev, Negative Index of Refraction in Optical Metamaterials, Optics Letters, v. 30, pp. 3356–3358 (2005)
  23. ^ a b c W. Cai, V.M. Shalaev, Optical Metamaterials: Fundamentals and Applications, Springer-Verlag, New York (2010)
  24. ^ a b W. Cai, U.K. Chettiar, H.-K. Yuan, V.C. de Silva, A.V. Kildishev, V.P. Drachev, and V.M. Shalaev, Metamagnetics with rainbow colors, Optics Express, v. 15, pp. 3333–3341 (2007)
  25. ^ Prof. V. Shalaev, Purdue University, Electrical & Computer Engineering
  26. ^ a b A.K. Popov and V.M. Shalaev, Negative-index metamaterials: second-harmonic generation, Manley-Rowe relations and parametric amplification, Applied Physics B, v. 84, pp. 131–37 (2006)
  27. ^ S. Xiao, U.K. Chettiar, A.V. Kildishev, V.P. Drachev, I.C. Khoo, and V.M. Shalaev, Tunable magnetic response of metamaterials, Applied Physics Letters, v. 95, p. 033114 (2009)
  28. ^ a b S. Xiao, V.P. Drachev, A.V. Kildishev, X. Ni, U.K. Chettiar, H.-K. Yuan, and V.M. Shalaev, Loss-free and active optical negative-index metamaterials, Nature, v. 466, pp. 735–738 (2010)
  29. ^ a b O. Hess, J. B. Pendry, S. A. Maier, R. F. Oulton, J. M. Hamm and K. L. Tsakmakidis, Active nanoplasmonic metamaterials, Nature Materials, v. 11, pp. 573-584 (2012)
  30. ^ H. Chen, C.T. Chan and P. Sheng, Transformation optics and metamaterials, Nature Materials, v. 9, pp. 387–396 (2010)
  31. ^ a b W. Cai, U.K. Chettiar, A.V. Kildishev and V.M. Shalaev, Optical cloaking with metamaterials, Nature Photonics, v. 1, pp. 224-227 (2007)
  32. ^ I.I. Smolyaninov, V.N. Smolyaninova, A.V. Kildishev, and V.M. Shalaev, Anisotropic Metamaterials Emulated by Tapered Waveguides: Application to Optical Cloaking, Physical Review Letters, v. 102, p. 213901 (2009)
  33. ^ V.M. Shalaev, Transforming Light, Science, v. 322, pp. 384–386 (2008)
  34. ^ A.V. Kildishev and V.M. Shalaev, Engineering space for light via transformation optics, Optics Letters, v. 33, pp. 43–45 (2008)
  35. ^ a b M. A. Noginov, G. Zhu, A. M. Belgrave, R. Bakker, V. M. Shalaev, E. E. Narimanov, S. Stout, E. Herz, T. Suteewong and U. Wiesner, Demonstration of a spaser-based nanolaser, Nature, v. 460, pp.1110–1112 (2009)
  36. ^ M. Premaratne and M.I. Stockman, Theory and Technology of SPASERs, Advances In Optics And Photonics, v. 9, pp. 79–128 (2017)
  37. ^ a b N. Yu, and F. Capasso, Optical Metasurfaces and Prospect of Their Applications Including Fiber Optics, Journal Of Lightwave Technology, v. 33, pp.2344–2358 (2015)
  38. ^ X. Ni, N. K. Emani, A.V. Kildishev, A. Boltasseva, and V.M. Shalaev, Broadband light bending with plasmonic nanoantennas, Science, v. 335, pp. 427 (2012)
  39. ^ A. V. Kildishev, A. Boltasseva, and V. M. Shalaev, Planar photonics with metasurfaces, Science, v. 339, p. 1232009 (2013)
  40. ^ a b X. Ni, S. Ishii, A.V. Kildishev, and V.M. Shalaev, Ultra-thin, planar, Babinet-inverted plasmonic metalenses, Light: Science & Applications, v. 2, p. e72 (2013)
  41. ^ a b X. Ni, A.V. Kildishev, and V.M. Shalaev, Metasurface holograms for visible light, Nature Communications, v. 4, pp. 1–6 (2013)
  42. ^ a b A. Shaltout, J. Liu, A. Kildishev, and V. Shalaev, Photonic spin Hall effect in gap-plasmon metasurfaces for on-chip chiroptical spectroscopy, Optica, v. 2, pp. 860-863 (2015)
  43. ^ C. Deeb, J.-L. Pelouard, Plasmon lasers: coherent nanoscopic light sources, Physical Chemistry Chemical Physics, v. 19, pp. 29731–29741 (2017)
  44. ^ Web of Science Core Collection Search Results
  45. ^ a b c d e V. M. Shalaev, Electromagnetic Properties of Small-Particle Composites, Physics Reports, v. 272, pp. 61–137 (1996)
  46. ^ a b V.M. Shalaev and A.K. Sarychev, Nonlinear optics of random metal-dielectric films, Physical Review B, v. 57, pp. 13265-13288 (1998)
  47. ^ a b V. M. Shalaev, Nonlinear Optics of Random Media: Fractal Composites and Metal-Dielectric Films, Springer (2000)
  48. ^ a b A.K. Sarychev, V.M. Shalaev, Electromagnetic field fluctuations and optical nonlinearities in metal-dielectric composites, Physics Reports, v. 335, pp. 275–371 (2000)
  49. ^ a b c A.K. Sarychev, V.M. Shalaev, Electrodynamics of Metamaterials, World Scientific (2007)
  50. ^ M.I. Stockman, V.M. Shalaev, M. Moskovits, R. Botet, T.F. George, Enhanced Raman scattering by fractal clusters: Scale-invariant theory, Physical Review B, v. 46, pp. 2821–2830 (1992)
  51. ^ a b D.P. Tsai, J. Kovacs, Zh. Wang, M. Moskovits, V.M. Shalaev, J.S. Suh, and R. Botet, Photon Scanning Tunneling Microscopy Images of Optical Excitations of Fractal Metal Colloid Clusters, Physical Review Letters, v. 72, pp. 4149–4152, (1994)
  52. ^ a b S. Gresillon, L. Aigouy, A.C. Boccara, J.C. Rivoal, X. Quelin, C. Desmarest, P. Gadenne, V.A. Shubin, A.K. Sarychev, and V.M. Shalaev Experimental Observation of Localized Optical Excitations in Random Metal-Dielectric Films, Physical Review Letters, v. 82, pp. 4520-4523 (1999)
  53. ^ a b A.K. Sarychev, V.A. Shubin, and V.M. Shalaev, Anderson localization of surface plasmons and nonlinear optics of metal-dielectric composites, Physical Review B, v. 60, pp. 16389–16408 (1999)
  54. ^ V.P. Safonov, V.M. Shalaev, V.A. Markel, Yu.E. Danilova, N.N. Lepeshkin, W. Kim, S.G. Rautian, and R.L. Armstrong, Spectral Dependence of Selective Photomodification in Fractal Aggregates of Colloidal Particles, Physical Review Letters, v. 80, pp. 1102–1105 (1998)
  55. ^ a b c d W. Kim, V.P. Safonov, V.M. Shalaev, and R.L. Armstrong, Fractals in Microcavities: Giant Coupled Multiplicative Enhancement of Optical Responses, Physical Review Letters, v. 82, pp. 4811–4814 (1999)
  56. ^ A. Otto, On the significance of Shalaev's 'hot spots' in ensemble and single‐molecule SERS by adsorbates on metallic films at the percolation threshold, J. Raman Spectroscopy, v. 37, pp. 937–947 (2006)
  57. ^ V.M. Shalaev, M.I. Stockman, Fractals: optical susceptibility and giant Raman scattering, Zeitschrift für Physik D - Atoms, Molecules and Clusters, v. 10, pp. 71–79 (1988)
  58. ^ A.V. Butenko, V.M. Shalaev, M.I. Stockman, Fractals: giant impurity nonlinearities in optics of fractal clusters, Zeitschrift für Physik D - Atoms, Molecules and Clusters, v. 10, pp. 81-92 (1988)
  59. ^ a b S.G. Rautian, V.P. Safonov, P.A. Chubakov, V.M. Shalaev, M.I. Shtockman, Surface-enhanced parametric scattering of light by silver clusters, JETP Lett. v. 47, pp. 243–246 (1988) (translated from Zh.Eksp.Teor.Fiz. v. 47, pp. 20–203 (1988))
  60. ^ A.V. Butenko, P.A. Chubakov, Yu.E. Danilova, S.V. Karpov, A.K. Popov, S.G. Rautian, V.P. Safonov, V.V. Slabko, V.M. Shalaev, M.I. Stockman, Nonlinear optics of metal fractal clusters, Zeitschrift für Physik D Atoms, Molecules and Clusters, v. 990, pp. 283-289 (1990)
  61. ^ V.M. Shalaev, R. Botet, R. Jullien, Resonant light scattering by fractal clusters, Physical Review B, v. 44, pp. 12216–12225 (1991)
  62. ^ V.M. Shalaev, M.I. Stockman, and R. Botet, Resonant excitations and nonlinear optics of fractals, Physica A, v. 185, pp. 181–186 (1992)
  63. ^ M. Breit, V. A. Podolskiy, S. Gresillon, G. von Plessen, J. Feldmann, J. C. Rivoal, P. Gadenne, A. K. Sarychev, and Vladimir M. Shalaev, Experimental observation of percolation-enhanced non-linear light scattering from semicontinuous metal films, Physical Review B, v. 64, p. 125106 (2001)
  64. ^ a b V.M. Shalaev, C. Douketis, T. Haslett, T. Stuckless, and M. Moskovits, Two-photon electron emission from smooth and rough metal films in the threshold region, Physical Review B, v. 53, p. 11193 (1996)
  65. ^ Prof. A. Boltasseva's research group site
  66. ^ P.R. West, S. Ishii, G.V. Naik, N.K. Emani, V.M. Shalaev, and A. Boltasseva, Searching for better plasmonic materials, Laser & Photonics Reviews, v. 4, pp. 795–808 (2010)
  67. ^ G.V. Naik, V.M. Shalaev, and A. Boltasseva, Alternative Plasmonic Materials: Beyond Gold and Silver, Advanced Materials, v. 25, pp. 3264–3294 (2013)
  68. ^ a b U. Guler, A. Boltasseva, and V. M. Shalaev, Refractory plasmonics, Science, v. 344, pp. 263–264 (2014)
  69. ^ U. Guler, V.M. Shalaev, A. Boltasseva, Nanoparticle Plasmonics: Going Practical with Transition Metal Nitrides, Materials Today, v. 18, pp. 227–237 (2014)
  70. ^ U. Guler, A. Kildishev, A. Boltasseva, and V.M. Shalaev, Plasmonics on the slope of enlightenment: the role of transition metal nitrides, Faraday Discussions, v. 178, pp. 71–86 (2015)
  71. ^ A. Boltasseva and V.M. Shalaev, All that glitters need not be gold, Science, v. 347, pp. 1308-1310 (2015)
  72. ^ a b A. Naldoni, U. Guler, Zh. Wang, M. Marelli, F. Malara, X. Meng, A.V. Kildishev, A. Boltasseva, V.M. Shalaev, Broadband Hot Electron Collection for Solar Water Splitting with Plasmonic Titanium Nitride, Advanced Optical Materials, v. 5, p. 1601031 (2017)
  73. ^ Prof. D. Faccio group, Heriot-Watt University, UK
  74. ^ L. Caspani, R.P.M. Kaipurath, M. Clerici, M. Ferrera, T. Roger, A. Di Falco, J. Kim, N. Kinsey, V. M. Shalaev, A. Boltasseva, D. Faccio, Enhanced Nonlinear Refractive Index in ε-Near-Zero Materials, Physical Review Letters, v. 116, p. 233901 (2016)
  75. ^ M. Clerici, N. Kinsey, C. DeVault, J. Kim, E. G. Carnemolla, L. Caspani, A. Shaltout, D. Faccio, V. Shalaev, A. Boltasseva, M. Ferrera, Controlling hybrid nonlinearities in transparent conducting oxides via two-colour excitation, Nature Communications v. 8, p. 15829 (2017)
  76. ^ S. Vezzoli, V. Bruno, C. DeVault, T. Roger, V.M. Shalaev, A. Boltasseva, M. Ferrera, M. Clerici, A. Dubietis, and D. Faccio1, Optical time reversal from time-dependent epsilon-near-zero media, Physical Review Letters, v. 120, p. 043902 (2018)
  77. ^ V. Bruno, C. DeVault, S. Vezzoli, D. Shah, S. Maier, A. Jacassi, S. Minguzzi, T. Huq, Z. Kudyshev, S. Saha, A. Boltasseva, M. Ferrera, M. Clerici, D. Faccio, R. Sapienza, V. Shalaev, Negative refraction in time-varying, strongly coupled plasmonic antenna-ENZ systems, Physical Review Letters, 124 (4), 043902 (January 30, 2020)
  78. ^ N. Kinsey, C. DeVault, A. Boltasseva, V. M. Shalaev, Near-zero-index materials for photonics, Nature Reviews Materials, v. 4, pp. 742–760 (2019)
  79. ^ M.Z. Alam, I. De Leon, R.W. Boyd, Large optical nonlinearity of indium tin oxide in its epsilon-near-zero region, Science, v. 352, pp. 795–797 (2016)
  80. ^ A.K. Popov, V.M. Shalaev, Doppler-free transitions induced by strong double-frequency optical excitations, Optics Communications, v. 35, pp. 189–193 (1980)
  81. ^ A.K. Popov, V.M. Shalaev, Doppler-free spectroscopy and wave-front conjugation by four-wave mixing of nonmonochromatic waves, Applied Physics, v.21, pp. 93–94 (1980)
  82. ^ A.K. Popov, V.M. Shalaev, Unidirectional Doppler-Free Gain And Generation In Optically Pumped Lasers, Applied Physics B, v. 27, pp. 63–67 (1982)
  83. ^ A.K. Popov, A.M. Shalagin, V.M. Shalaev, V.Z. Yakhnin, Drift of gases induced by nonmonochromatic light, Applied physics, v.25, pp. 347–350 (1981)
  84. ^ V.M. Shalaev and V.Z. Yakhnin, LID sound generated by pulsed excitation in gases, Journal of Physics B: Atomic and Molecular Physics, v.20, pp. 2733–2743 (1987)
  85. ^ S. Kawata, V.M. Shalaev (editors), Tip Enhancement, Elsevier (2007)
  86. ^ S. Kawata, V.M. Shalaev (editors), Nanophotonics with Surface Plasmons, Elsevier (2007)
  87. ^ V.M. Shalaev (editor), Optical Properties of Nanostructured Random Media, Springer (2002)
  88. ^ V.M. Shalaev, M. Moskovits (editors), Nanostructured Materials: Clusters, Composites, and Thin Films, American Chemical Society (1997)
  89. ^ Prof. V. Shalaev's website: Publications
  90. ^ Prof. V. Shalaev's website: Conference Talks
  91. ^ Prof. V. Shalaev's website: Invited Lectures