title: Miniature Spatial Heterodyne Raman Spectrometer with a Cell Phone Camera Detector.
abstract: A spatial heterodyne Raman spectrometer (SHRS) with millimeter-sized optics has been coupled with a standard cell phone camera as a detector for Raman measurements. The SHRS is a dispersive-based interferometer with no moving parts and the design is amenable to miniaturization while maintaining high resolution and large spectral range. In this paper, a SHRS with 2.5 mm diffraction gratings has been developed with 17.5 cm-1theoretical spectral resolution. The footprint of the SHRS is orders of magnitude smaller than the footprint of charge-coupled device (CCD) detectors typically employed in Raman spectrometers, thus smaller detectors are being explored to shrink the entire spectrometer package. This paper describes the performance of a SHRS with 2.5 mm wide diffraction gratings and a cell phone camera detector, using only the cell phone's built-in optics to couple the output of the SHRS to the sensor. Raman spectra of a variety of samples measured with the cell phone are compared to measurements made using the same miniature SHRS with high-quality imaging optics and a high-quality, scientific-grade, thermoelectrically cooled CCD.
authors: University of South Carolina, Department of Chemistry and Biochemistry, SC, USA.
authors: Patrick D
authors: PD
authors: Barnett
authors: University of South Carolina, Department of Chemistry and Biochemistry, SC, USA.
authors: S Michael
authors: SM
authors: Angel
keywords: Miniature Raman; SHRS; SHS; cell phone Raman; spatial heterodyne Raman spectrometer; spatial heterodyne spectrometer