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SUB 1-Millimeter Size Fresnel Micro SpectrometerAn ultra-small micro spectrometer with less than 1mm diameter was constructed using Fresnel diffraction. The fabricated spectrometer has a diameter of 750 nmicrometers and a focal length of 2.4 mm at 533nm wavelength. The micro spectrometer was built with a simple negative zone plate that has an opaque center with an ecliptic shadow to remove the zero-order direct beam to the aperture slit. Unlike conventional approaches, the detailed optical calculation indicates that the ideal spectral resolution and resolving power do not depend on the miniaturized size but only on the total number of rings. We calculated 2D and 3D photon distribution around the aperture slit and confirmed that improved micro-spectrometers below 1mm size can be built with Fresnel diffraction. The comparison between mathematical simulation and measured data demonstrates the theoretical resolution, measured performance, misalignment effect, and improvement for the sub-1mm Fresnel micro-spectrometer. We suggest the utilization of an array of micro spectrometers for tunable multi-spectral imaging in the ultra violet range.
Document ID
20100033750
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Park, Yeonjoon (National Inst. of Aerospace Hampton, VA, United States)
Koch, Laura (Norfolk State Univ. VA, United States)
Song, Kyo D. (Norfolk State Univ. VA, United States)
Park, Sangloon (Kyungwon Univ. Sungnam, Korea, Republic of)
King, Glen (NASA Langley Research Center Hampton, VA, United States)
Choi, Sang (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2010
Subject Category
Engineering (General)
Report/Patent Number
LF99-6289
Funding Number(s)
CONTRACT_GRANT: SAA-15546
WBS: WBS 492505.01.07.89H7.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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