Abstract
A heterodyne lock‐in imaging scheme is introduced to overcome NIR camera speed limitations and poor signal‐to‐noise ratios, thereby generating high‐frequency carrierographic imaging up to 10 kHz. A theoretical model was established to investigate the heterodyne signal generation mechanism as well as to extract the major carrier transport parameters by best‐fitting the entire modulation frequency dependence. Good agreement was found between the theoretically predicted and experimentally measured heterodyne amplitude dependence on excitation intensity. A contrast inversion feature in the high‐frequency heterodyne amplitude images was observed. High‐frequency information presents a method for resolving local near‐surface carrier transport parameters from the lumped effective lifetime, thereby providing ac‐diffusion‐length‐controlled depth‐selective/resolved imaging.Heterodyne lock‐in carrierography (LIC) amplitude images of a crystalline silicon wafer at different frequencies.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
