Physics of Internal Photoemission and Its Infrared Applications in the Low-Energy Limit

Figure 15

(a) Spectral weights of response. Different excitation levels are indicated as . The sample under measurements is SP1006. (b) Power of the external excitation optical source (incident on the active area of ). (c)-(d) The VLWIR response (at  V) varying with the excitation power. The arrows indicate the cut-on wavelength of the filter and the phonon features of the GaAs beamsplitter, respectively.