Optical performance of circular Fresnel spectrometer

Yeonjoon Park; Hyunjung Kim; Glen King; Uhn Lee; Sang H. Choi

doi:10.1117/12.880501

15 April 2011 Optical performance of circular Fresnel spectrometer

Yeonjoon Park, Hyunjung Kim, Glen King, Uhn Lee, Sang H. Choi

Proceedings Volume 7980, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2011; 798005 (2011) https://doi.org/10.1117/12.880501
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

Most of today's spectrometers are based on Fraunhofer diffraction with a periodic regular line grating. We demonstrate a new type of a spectrometer which is based on Fresnel diffraction that can be miniaturized smaller than Fraunhofer diffraction limit, a²/λ where a is the aperture size, and λ is the wavelength of the light. The theory, fabrication, and optical performance of the miniaturized Fresnel spectrometer with a circular Fresnel grating, i.e. zone-plate will be presented. The theoretical calculation shows that the spectral resolution of Fresnel spectrometer is not fundamentally determined by the size of the grating but it is determined by the total number of rings. The miniaturized Fresnel spectrometer has a circular grating of 750 micrometer diameter and the volume of the optical path between the grating and the aperture slit is only 1mm³. In spite of this small dimension, it achieved a spectral resolution of 22nm which is similar to the typical value of a color filter.

Citation Download Citation

Yeonjoon Park, Hyunjung Kim, Glen King, Uhn Lee, and Sang H. Choi "Optical performance of circular Fresnel spectrometer", Proc. SPIE 7980, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2011, 798005 (15 April 2011); https://doi.org/10.1117/12.880501

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KEYWORDS

Spectroscopy

Photons

Spectral resolution

Diffraction gratings

Far-field diffraction

Near field diffraction

Zone plates

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