3-DIMENSIONAL THEORY TO STUDY PHOTOTHERMAL PHENOMENA OF SEMICONDUCTORS .2. MODULATED PHOTOTHERMAL DEFLECTION

The investigation is further extended to the modulated photothermal deflection (PTD). The three-dimensional Navier-Stokes equation is solved analytically for a layered-structure sample, and then numerical calculations are given. The influences of the optical, thermal, and electronic parameters on the PTD signal are discussed in detail. It is shown that the thermal lens and electronic-strain effects make significant contributions to the PTD signal, but the thermoelastic effect is dominant. The potential applications of the PTD technique to microscopic imaging are discussed.