Binary Complementary Filters for Compressive Raman Spectroscopy
Abstract
The previously described optimized binary compressive detection (OB-CD) strategy enables fast hyperspectral Raman (and fluorescence) spectroscopic analysis of systems containing two or more chemical components. However, each OB-CD filter collects only a fraction of the scattered photons and the remainder of the photons are lost. Here, we present a refinement of OB-CD, the OB-CD2 strategy, in which all of the collected Raman photons are detected using a pair of complementary binary optical filters that direct photons of different colors to two photon counting detectors. The OB-CD2 filters are generated using a new optimization algorithm described in this work and implemented using a holographic volume diffraction grating and a digital micromirror device (DMD) whose mirrors are programed to selectively direct photons of different colors either to one or the other photon-counting detector. When applied to pairs of pure liquids or two-component solid powder mixtures, the resulting OB-CD2 strategy is shown to more accurately estimate Raman scattering rates of each chemical component, when compared to the original OB-CD, thus facilitating chemical classification at speeds as fast as 3 μs per measurement and the collection of Raman images in under a second.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 07, 2017
- Source ID
- 10.1177/0003702817732324
Entities
People
- Bharat R. Mankani
- Bradley J. Lucier
- Dor Ben-amotz
- Gregery T. Buzzard
- Owen G. Rehrauer
- Vu C. Dinh
Organizations
- Fred Hutchinson Cancer Center
- Office of Naval Research
- Purdue University
- Simons Foundation