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Multimodal multiplex spectroscopy using photonic crystals

Zhaochun Xu, Zhanglei Wang, Michael E. Sullivan, David J. Brady, Stephen H. Foulger, and Ali Adibi

Open Access Open Access

Abstract

Spatio-spectral transmission patterns induced on low coherence fields by disordered photonic crystals can be used to construct optical spectrometers. Experimental results suggest that 1–10 nm resolution multimodal spectrometers for diffuse source analysis may be constructed using a photonic crystal mounted on a focal plane array. The relative independence of spatial and spectral modal response in photonic crystals enables high efficiency spectral analysis of diffuse sources.

©2003 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Proposed microspectromer based on spatio-spectral structure in the transmittance of inhomogeneous disordered photonic crystals for diffuse source characterization.

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Fig. 2.
Fig. 2. True color photographs of the photonic crystal opal structure illuminated by a white light source. (A) 20X magnification. (B) 4X magnification.

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Fig. 3.
Fig. 3. Transmission curves as a function of wavelength at points p1 through p7. The points are on a 100 micron spaced grid immediately behind the photonic crystal.

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Fig. 4.
Fig. 4. Spectral diversity map of the opal structure. The standard deviation of transmission curves (Fig. 3) was used as a metric of spectral diversity for each point of the photonic crystal. Regions 1,2, and 3 in the plot exhibit strong spectral diversities, and those regions were chosen in our spectral estimation algorithm.

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Fig. 5.
Fig. 5. (800 KB movie) A series of images at different illumination wavelength. Click here to start the movie. One can see that there are three regions with strong pattern variations corresponding to those in Fig. 4.

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Fig. 6.
Fig. 6. Spectra reconstruction. (A) Liquid crystal display (LCD) spectrum reconstruction. (B) Neon lamp spectrum reconstruction. In both (A) and (B), the red lines are true spectra taken by Ocean Optics USB2000 optic fiber spectrometer; the cyan bar plots are numerically reconstructed spectra using the photonic crystal spectrometer.

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