| 摘要 |
<p>A photodetector which comprises a surface-profiled Schottky barrier detector (22) having a peak response which is a function of wavelength and of angle of incidence, and a blazed diffraction grating (20) positioned in front of the barrier detector and having its dispersion selected so that its first order of diffracted light is incident on the barrier detector with an angle of incidence (A1, A2) which so varies as substantially to compensate for the peak response function of the barrier detector, thereby to produce a peak response from the barrier detector throughout a range of wavelengths. In this way, the bandwidth of the photodector can be controlled.</p> |
