Through art and science in their broadest senses it is possible to make a permanent contribution towards the improvement and enrichment of human life and it is these pursuits that we students are engaged in.

Frederick Sanger


Lev Deych, Professor

Optics and Condensed Matter Theory

(718) 997-3380, SB B222
M. S. in Physics, Tajik State University , Dushanbe , 1982
Ph. D. in Physics, Kirensky Institute of Physics, Krasnoyarsk , 1991
PHYS 005 - Physics and the Future
PHYS 237 - Mechanics
PHYS 611 - Analytical Mechanics

Prof. Deych research is currently focused on properties and applications of optical Whispering Gallery Modes. These modes arise when light is confined within an axially symmetric optical resonator. Examples of such resonators are dielectric spheres or toroids. Light propagating along an equator of such a structure almost tangentially to its surface is prevented from escaping from the resonator due to total internal reflection: the light is trapped (or confined) inside the resonator. The similar phenomenon also occurs with sound waves and can be observed in a number of historically famous buildings such as St. Paul's Cathedral in London or Grand Central station in New York City: if one whispers something into the wall of a circular gallery, the sound of the whisper will propagate along the circumference of the wall and can be heard by someone standing by the wall at the diametrically opposite point. Hence, the name: Whispering Gallery Modes (WGM).

These special excitations of light have very special properties and are extremely useful for various applications. Prof. Deych's research interests lie in application of these modes in biosensing, where the goal is to develop a sensor capable of detecting viruses or other biological objects. The unique ability of WGMs to detect small particles and even single molecules results from two important characteristics of these modes. First, they produce extremely narrow lines in the spectrum of light scattered from the resonators. As a result, even very small shifts of these lines can be spectrally resolved. Second, the field of these modes is concentrated in the vicinity of the resonator's surface, where it is strongly enhanced. This enhancement of the field amplifies effects of smallest changes in the environment, such as adsorption of a virus to the surface of the resonator, resulting in observable shifts of the spectral lines.  

Another aspect of the Whispering Gallery Modes studied by Prof. Deych and his students is concerned with mechanical action of light. It has been well known for a long time that light can produce mechanical forces on polarizable dielectrics. Prof. Deych's research showed that confining light within WGM resonators significantly changes these forces and give them new unexpected characteristics. Prof. Deych studies how these changes can be exploited for optical manipulation of small objects and optical cooling. 

 A separate direction of Prof. Deych's research is concerned with optical properties of  Bragg Multiple Quantum Wells. These are periodic structures consisting of very thin (about 10 nm) layers of one semiconductor (wells) separated by wider (about 100 nm) layers of other semiconductors (barriers). When the period of such a structure is made equal to the half wavelength of light emitted by excitons confined inside wells, the structure is called Bragg structure, because the light emitted by the structure is in the resonance (called Bragg resonance) with the period of the structure. Prof. Deych and his QC colleague, Prof. Lisyansky, developed a theoretical description of optical properties of these structures. Main predictions of this theory have been observed experimentally by another QC faculty member, Prof. Menon in collaboration with Prof. Oktyabrsky of SUNY College of Nanoscale Science and Engineering. The results of this work have been published in Nature Photonics.   

Selected articles:

  1. Single parameter scaling in one-dimensional localization revisited, L.I. Deych, A.A. Lisyansky, and B.L. Altshuler, Phys. Rev. Lett., 84, 2678 (2000).
  2. Polariton Dispersion Law in Long Bragg and almost Bragg Multiple Quantum Well Structures, L.I. Deych and A.A. Lisyansky, Phys. Rev. B, Phys. Rev. B, 62, 4242 (2000).
  3. Scaling in the one-dimensional Anderson localization problem in the region of fluctuation states, L.I. Deych, M.V. Erementchouk, and A.A. Lisyansky. Phys. Rev. Lett., 2003, 90, 126601
  4. Scaling and the center-of-band anomaly in a one-dimensional Anderson model with diagonal disorder, L.I. Deych, M.V. Erementchouk, A.A. Lisyansky, and B.L. Altshuler, Phys. Rev. Lett., 2003 91, 096601 (2003)
  5. Spectral engineering with multiple quantum well structures, L.I. Deych, M.V. Erementchouk, and A.A. Lisyansky, Appl. Phys. Lett. 2003, 83, 4562
  6. Multiple-quantum-well-based photonic crystals with simple and compound elementary supercells, E.L Ivchenko, M.M. Voronov, M.E. Erementchouk, L.I. Deych, A.A. Lisyansky, Phys. Rev. B 70, 195106 (2004)
  7. Optical properties of one-dimensional photonic crystals based on multiple-quantum-well structures, M.V. Erementchouk, L.I. Deych and A.A. Lisyansky, Phys. Rev. B 71, 235335 (2005)
  8. Effects of spatial non-uniformity on laser dynamics, L.I. Deych, Phys. Rev. Lett. 95, 043902 (2005)
  9. Exciton luminescence in one-dimensional resonant photonic crystals:  A phenomenological approach, L.I. Deych, M.V. Erementchouk, A.A. Lisyansky, E.L. Ivchenko, M.M. Voronov, Phys. Rev. B 76, 075350 (Selected for Virtual Journal of Nanoscale Science & Technology, v. 16 (12), 2007).
  10. Propagation of fundamental modes in coupled microspheres, L.I. Deych, C. Schmidt, A. Chipouline, T. Pertsch, A. Tünnermann, 2008, Phys. Rev. A (Rapid Communications), 77, 051801 (R).
  11. Propagation of the fundamental whispering gallery modes in a linear chain of microspheres, L.I. Deych, C. Schmidt, A. Chipouline, T. Pertsch, A. Tünnermann, 2008, Applied Physics B, 93, 21
  12. Statistical Properties of one-dimensional random lasers. O. Zaitsev, Lev Deych, V. Shuvayev, 2009, Phys. Rev. Lett. 102, 043906.
  13.  Luminescence properties of a Fibonacci photonic quasicrystal, Vasilios Passias, Zhou Shi,  Nikesh Valappil, Lev Deych, Alexander Lisyansky, and Vinod M. Menon, 2009 Optics Express, 17, 6636
  14. Observation of optical coupling in microdisk resonators”, C. Schmidt, A. Chipouline, T. Käsebier, E.B., Kley, A. Tünnermann, T. Pertsch, V. Shuvayev, L.I.  Deych, 2009 Phys. Rev. A, 80, 043841
  15. Exciton-Lattice-Polaritons in Multiple-Quantum-Well based Photonic Crystals”, D. Goldberg,  L. I. Deych, A. A. Lisyansky, Z. Shi, V. M. Menon, V. Tokranov, M. Yakimov, S. Oktyabrsky, 2009, Nature Photonics, 3, 662
  16. Rayleigh scattering of whispering gallery modes of microspheres due to a single dipole scatterer, L.I. Deych and J.T. Rubin, 2009, Phys. Rev A (Rapid Communication), 80, 061805 (R).
  17. Recent developments in the theory of multimode random lasers(Review article), O. Zaitsev and L.I. Deych, 2010, Journal of Optics A, (Special issue), 12, 024001
  18. Diagrammatic semiclassical laser theory, O. Zaitsev and L. Deych, 2010, Phys. Rev. A, 81, 023822.
  19. Ab initio theory of defect scattering in spherical whispering-gallery-mode resonators, J.T. Rubin, and L.I. Deych, 2010, Phys. Rev. A, 81, 053827
  20. Effect of size disorder on the optical transport in chains of coupled microspherical resonators,Chao-Sheng Deng, Hui Xu, and Lev Deych, 2011, Opt. Express, 19, 6923
  21. Plasmon-resonance-induced enhancement of the reflection band in a one dimensional metal nanocomposite photonic crystal, 2011, S. Husaini, L. Deych and V. Menon, 36, 1368
  22. Ab initio description of nonlinear dynamics of coupled microdisk resonators with application to self-trapping dynamics, 2011, H. Ramezani, T. Kottos, V. Shuvayev, and L. Deych,  Phys Rev A 83 053839
  23. Defect-induced whispering-gallery-mode resonances in optical microdisk resonators, 2011, Lev Deych, Michel Ostrowski, and Yasha Yi, Opt. Lett. 36 (16), 3154
  24. Optical forces due to WGM spherical microresonators and their manifestation in optically induced orbital motion of nanoparticles, 2011, J. Rubin, L. Deych, Phys Rev. A 84, 023844.
  25. On optical forces in spherical whispering gallery mode resonators, 2011, J. Rubin, L. Deych, Optics Express, 19, 22337.
  26. Resonant enhancement of magneto-optical polarization conversion in microdisk resonators”, 2011, L. Deych, C. Meriles, V. Menon, Appl. Phys. Lett. 99, 241107  
  27. About possibility of bistable dynamics in lasers with single-mode cavities, 2013, Vladimir Shuvayev, Vinod Menon, Alexander Lisyansky, and Lev Deych, J. Opt. Soc. Am B,  30, 79