Patent ID: 11860087
Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A system for nanoscale tomographic infrared absorption imaging, the system comprising:
an infrared light emitter;
an actuated probe configured to detect displacement of a surface of a sample; and
a controller comprising one or more processors, wherein the one or more processors are configured to perform controller operations comprising:
generating a first plurality of sets of probe measurements for a plurality of sample locations located across a surface of a sample, wherein generating, for a particular sample location, a particular set of probe measurements of the first plurality of sets of probe measurements comprises:
generating a first probe measurement of the particular set of probe measurements by operating the infrared light emitter to illuminate the sample with infrared light at a first wavelength that varies at a first frequency and operating the actuated probe to measure a magnitude and phase of a variation in displacement of the surface of the sample over time at the particular sample location at the first frequency; and
generating a second probe measurement of the particular set of probe measurements by operating the infrared light emitter to illuminate the sample with infrared light at the first wavelength that varies at a second frequency and operating the actuated probe to measure a magnitude and phase of a variation in displacement of the surface of the sample over time at the particular sample location at the second frequency, wherein the first frequency and the second frequency differ; and

generating, based on the first plurality of sets of probe measurements, a three--dimensional tomographic map of absorption of infrared light at the first wavelength by the sample.