Project Info


Numerical investigation of multiwavelength algorithms for hyperspectral imaging and multimodal metrologies

Daniel Adams | daadams@mines.edu

The last decade has seen a revolution in new and exciting forms of microscopies and metrologies. At the forefront of this revolution are so-called diffractive imaging techniques [1]–[3]. In diffractive imaging, light scatters from an object and is collected in intensity, far from the sample. The recorded scatter patterns are numerically processed using sophisticated algorithms that reconstruct simultaneous phase and amplitude images of the diffracting specimens. The combination of phase and amplitude information means that these techniques have direct access to the index of refraction of scattering samples. Recent advances have even made hyperspectral and single-shot imaging modalities a reality [4], [5]. In this proposal, the PI is requesting support for one undergraduate student to numerically investigate a variety of multimodal, single-shot [6] imaging techniques. The goal is to eventually apply these new algorithms to image a variety of samples in both phase and amplitude across a broad bandwidth of incident wavelengths. An ideal light source covering nearly the entire spectrum from the extreme ultraviolet to terahertz are the femtosecond laser systems hosted in the general research laboratories here at Mines. Under the supervision of the PI, the undergraduate student will have the opportunity to deploy their multimodal, single-shot imaging techniques and algorithms on these ultrafast laser systems. Furthermore, due to the complexity of the algorithms and size of the data, the student will work with highly parallelized architectures like graphical processing units.

More Information

[1] J. Miao, P. Charalambous, J. Kirz, and D. Sayre, “Extending the methodology of X-ray crystallography to allow imaging of micrometre-sized non-crystalline specimens,” Nature, vol. 400, no. 6742, pp. 342–344, Jul. 1999.
[2] A. M. Maiden and J. M. Rodenburg, “An improved ptychographical phase retrieval algorithm for diffractive imaging.,” Ultramicroscopy, vol. 109, no. 10, pp. 1256–62, Sep. 2009.
[3] P. Thibault, M. Dierolf, O. Bunk, A. Menzel, and F. Pfeiffer, “Probe retrieval in ptychographic coherent diffractive imaging.,” Ultramicroscopy, vol. 109, no. 4, pp. 338–43, Mar. 2009.
[4] P. Thibault and A. Menzel, “Reconstructing state mixtures from diffraction measurements.,” Nature, vol. 494, no. 7435, pp. 68–71, Feb. 2013.
[5] D. J. Batey, D. Claus, and J. M. Rodenburg, “Information multiplexing in ptychography.,” Ultramicroscopy, vol. 138C, pp. 13–21, Dec. 2013.
[6] P. Sidorenko and O. Cohen, “Single-shot ptychography,” Optica, vol. 3, no. 1, p. 9, 2016.

Grand Engineering Challenge: Not applicable

Student Preparation


Qualifications

A strong desire to learn and enthusiasm for science.

Time Commitment

22 hours/month

Skills/Techniques Gained

Skills Developed:
• Experience with electronics
• Beam shaping phase/amplitude
• Experience with ultrafast lasers and laser safety
• Computer/device interfacing
• Programming (Matlab/Python/LabView)

Mentoring Plan

PI expectations for the PI:
• 5.5 hr/wk time with students in the laboratory and meeting
• 1 weekly, 30-minute meeting (included in 5.5 hr/wk schedule)
• Available via email/skype etc. when not available in person