Resolving pm wavelength shifts in optical sensing |
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Authors: | O Schmidt P Kiesel S Mohta NM Johnson |
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Institution: | (1) Palo Alto Research Center Inc., 3333 Coyote Hill Road, Palo Alto, CA 94304, USA |
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Abstract: | The reflection or transmission properties of one and two-dimensional photonic crystals are widely used for optical sensing
applications. A variety of optical sensors exist that change their optical properties upon receiving a stimulus. A compact
wavelength detector capable of resolving very small changes in the spectral output of these sensors is highly desirable. A
photodiode array (PDA) or position sensor device (PSD) in combination with a linear variable band-pass filter constitutes
a very robust and compact device to detect those changes. The filter converts the wavelength information of the incident light
into a spatial intensity distribution that is analyzed by the photodetector. We have investigated the performance of these
wavelength detectors depending on the optical properties of the filter. This includes the gradient with which the transmission
peak shifts across the filter surface and the spectral width of the transmission function. Also, we point out differences
between the PDA and the PSD and analyze the influence of inhomogeneous illumination on the unit.
PACS 42.68.Ay; 42.79.-e; 42.81.Pa |
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Keywords: | |
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