Open AccessTunable hyperchromatic lens system for confocal hyperspectral sensing
Author(s) -
Phuong-Ha Cu-Nguyen,
Adrian Grewe,
Matthias Hillenbrand,
Stefan Sinzinger,
Andreas Seifert,
Hans Zappe
Publication year - 2013
Publication title -
optics express
Language(s) - Danish
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.027611
Subject(s) - optics , hyperspectral imaging , lens (geology) , materials science , chromatic aberration , achromatic lens , confocal , optoelectronics , chromatic scale , physics , computer science , artificial intelligence
A new approach for confocal hyperspectral sensing based on the combination of a diffractive optical element and a tunable membrane fluidic lens is demonstrated. This highly compact lens system is designed to maximize the longitudinal chromatic aberration and select a narrow spectral band by spatial filtering. Changing the curvature of the fluidic lens allows the selected band to be scanned over the whole given spectrum. A hybrid prototype with an integrated electro-magnetic micro-actuator has been realized to demonstrate the functionality of the system. Experimental results show that the spectrum transmitted by the system can be tuned over the entire visible wavelength range, from 450 to 900 nm with a narrow and almost constant linewidth of less than 15 nm. Typical response time for scanning the spectrum by 310 nm is less than 40 ms and the lens system shows a highly linear relationship with the driving current.