Acknowledgement: This work was made possible by a grant from the National Science Foundation (Career Development Program Grant No. 1653270).
Below is a series of materials to help train new users (and hopefully builders) of time domain thermoreflectance (TDTR) systems. Because the potential audience for this is quite diverse, information is given at wide range of detail-level spanning that hopefully accommodates everyone from the complete newcomer to TDTR gurus; some of the information is generic but in many cases I’ve tried to include quantitative performance examples and give specific examples of model numbers/equipment. Information is given about a wide variety of different TDTR systems/layouts in use, though most of my own experience is with two-tint TDTR a la David Cahill’s design at UIUC, so there is some bias in that direction.
What to Expect: Course Layout (slides / video)
What is TDTR? An Overview (slides / video)
Intro to Polarization Optics
What is polarization?
Common polarization optics:
Polarizing Beam Splitters (PBS)
λ/2 (halfwave) plates
λ/2-plate, PBS combo for power adjustment
Common Variants of TDTR (two polarization vs. two color)
Walkthrough of Two-Tint TDTR Hardware
Generating laser pulses
Laser Power Selection
Dividing the pulses into “Pump” and “Probe”
Modulating the Pump pulses
Advancing the Pump arrival time
Recombining the Pump/Probe
Focusing the Laser on the Sample
Measuring the Change in Reflected Probe Beam
Rejecting the Reflected Pump Beam
Lockin Amplification of the Signal