Room Temperature Bistability, Logic Gate Operation, Incoherent Switching and High Signal Gain with InSb Devices

  • S. D. Smith
  • F. A. P. Tooley


We present details of the performance of several devices utilising the giant nonlinear refractive index of InSb (n2 = 0.1 cm2/kW at 77 K and 5.5 µm; n2 = 10-4 cm2/kW at 300 K and 10.6 µm). Optical bistability was observed at 300 K using a CO2 laser with intensities of order 100 kW/cm2 and switching times 5–30 ns. At 77 K and 5.5 µm devices could be operated with cw holding beams combined with time-varying switching or signal pulses. The Tall-optical circuit elements1 demonstrated are: (i) AND, OR, NAND or NOR gates in which ‘switch on’ of the function is inferred to be on a picosecond timescale and ‘switch off’ of the order of carrier recombination time; (ii) the switching of one optical logic gate by another; (iii) switching of a bistable device in both directions with an incoherent beam; (iv) two beam signal amplification in a transphasor of order 1.3 × 104.


Logic Gate Optical Bistability Flash Lamp Switching Energy Bistable Switching 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    D.A. B. Miller, M.H. Mozolowski, A. Miller and S.D. Smith, Optics Commun., 27:133 (1978).ADSzbMATHCrossRefGoogle Scholar
  2. 2.
    D.A.B. Miller, S.D. Smith and A. Johnston, Appl. Phys. Lett., 35:658 (1979).ADSCrossRefGoogle Scholar
  3. 3.
    D.A.B. Miller, C.T. Seaton, M.E. Prise and S.D. Smith, Phys. Rev. Lett., 47:197 (1981).ADSCrossRefGoogle Scholar
  4. 4.
    A.K. Kar, J.G.H. Mathew, S.D. Smith, B. Davis and W. Prettl, Appl. Phys, Lett., 42:334 (1983).ADSCrossRefGoogle Scholar
  5. 5.
    H.M. Gibbs, S.L. McCall, T.N.C. Venkatesan, A.C. Gossard, A. Passner and W. Wiegmann, Appl. Phys. Lett., 35:451 (1979).ADSCrossRefGoogle Scholar
  6. 6.
    C.T. Seaton, S.D. Smith, F.A.P. Tooley, M.E. Prise and M.R. Taghizadeh, Appl. Phys. Lett., 42:131 (1983).ADSCrossRefGoogle Scholar
  7. 7.
    W.J. Firth, C.T. Seaton, E.M. Wright and S.D. Smith, Appl. Phys. B28:131 (1982).ADSGoogle Scholar
  8. 8.
    W.J. Firth and E.M. Wright, Optics Commun., 40:233 (1982); J.V. Moloney and H.M. Gibbs, Phys. Rev. Lett., 48:1607 (1982).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • S. D. Smith
    • 1
  • F. A. P. Tooley
    • 1
  1. 1.Physics DepartmentHeriot-Watt UniversityRiccartonUK

Personalised recommendations