Dispersion multiplexing with broadband filtering for miniature spectrometers.
We replace the traditional grating used in a dispersive spectrometer with a multiplex holographic grating to increase the spectral range sensed by the instrument. The multiplexed grating allows us to measure three different, overlapping spectral bands on a color digital focal plane. The detector's broadband color filters, along with a computational inversion algorithm, let us disambiguate measurements made from the three bands. The overlapping spectral bands allow us to measure a greater spectral bandwidth than a traditional spectrometer with the same sized detector. Additionally, our spectrometer uses a static coded aperture mask in the place of a slit. The aperture mask allows increased light throughput, offsetting the photon loss at the broadband filters. We present our proof-of-concept dispersion multiplexing spectrometer design with experimental measurements to verify its operation.
Cull
E C
EC
Duke University Fitzpatrick Institute for Photonics, Durham, NC 27708, USA.
Gehm
M E
ME
Brady
D J
DJ
Hsieh
C R
CR
Momtahan
O
O
Adibi
A
A
D000465:Algorithms; D003116:Color; D004867:Equipment Design; D005374:Filtration; D007090:Image Interpretation, Computer-Assisted; D008027:Light; D015233:Models, Statistical; D010363:Pattern Recognition, Automated; D017785:Photons; D012031:Refractometry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013053:Spectrophotometry / Q000379:methods*