TANG Sing Hai

Professorial Fellow

• Nonlinear Photonic Crystals
  Fabrication of NLPC of various designs and study of parametric and cascaded-parametric interaction processes covering spectrum range from the visible to the terahertz range.

• Nonlinear Optics of Nanostructures
  Ultrafast nonlinear optical dynamics in noble metal/dielectric, metal/semiconductor nanocomposites and one-dimensional photonic crystals. Investigation of spin dynamics on the subpicosecond timescales by time-resolved magneto-optical technique.

• Terahertz Time-Domain Spectroscopy
  THz-TDS operates with sub-picosecond pulses of electromagnetic radiation, which in the frequency domain implies the coverage of a very broad range spanning from tens of gigahertz to a few terahertz. Research area includes nanoscale materials and bio-molecular materials.

• Characterization of domain structure of periodically poled Mg:LiNbO3 through multifrequency terahertz generation, W. M. Liu, A. N. Tuchak,Y. H. Yan, G. Kitaeva and S. H. Tang, OPTICS LETTERS, Vol. 34, No. 13 (July 1, 2009 )

• Photon energy and carrier density dependence of spin dynamics in bulk CdTe crystal at room temperature, Ma H, Jin ZM, Ma GH, Tang SH, Appl.  Phys. Letts,  Volume: 94   Issue: 24  (June 15 2009)

• Two-photon absorption in quantum dots of cdsxse1-x using open aperture z-scan and femtosecond laser, Kumar J, Verma A , Pandey PK, Bhatnagar PK, Mathur PC, Bhatnagar M, Liu W, Tang SH,  NANO  Volume: 4   Issue: 1   Pages: 23-29 (2009)

• Characterization of narrow-band terahertz shaping in periodically poled Mg:LiNbO3 using multipulse pump probe, W. M. Liu, H. C. Guo, G. Kh. Kitaeva, A. N. Tuchak, Y. H. Yan, and S. H. Tang, J.  Appl. Phys. 105, (February 12, 2009)

• Ultrafast optical nonlinearity enhancement in metallodielectric multilayer stacks, Ma GH, Tang SH, OPTICS LETTERS   Volume: 32   Issue: 23   (DEC 1, 2007)

• Controlled surface-plasmon coupling in SiO2-coated gold nanochains for tunable nonlinear optical properties. Yang Y, Nogami M, Shi JL, Ma GH, Tang SH, Appl. Phys. Lett., 88 (8) ( Feb 20, 2006).

• Observation of two-photon absorption enhancement at double defect modes in one-dimensional photonic crystals. Shen J, Zhang ZJ, Hua ZY, Ma GH, Tang SH, Appl. Phys. Lett., 88 (1) (Jan 2, 2006).

• Parametric downconversion via cascaded optical nonlinearities in an aperiodically poled MgO: LiNbO3 superlattice. H. C. Guo, S. H. Tang, Y. Q. Qin, Appl. Phys. Lett., 87(16), ( Oct 17 2005).