Title :
Reconfigurable near-infrared optical filter with a micromechanical diffractive Fresnel lens
Author :
Lacolle, Matthieu ; Sagberg, Håkon ; Johansen, Ib-Rune ; Løvhaugen, Odd ; Solgaard, Olav ; Sudbø, Aasmund S.
Author_Institution :
Dept. of Phys., Univ. of Oslo, Norway
Abstract :
We have fabricated and characterized a micromechanical Fresnel lens that serves as a reconfigurable filter for near-infrared spectrometry, for the analysis of gas, liquids, or solids. The lens consists of silicon segments that can be individually actuated. Moving the segments vertically controls the spectrum of the light that is focused on a detector. The holographic pattern on top of the segments permits both focusing of the light and spectral control. We have demonstrated experimentally the desired spectral control of the filter.
Keywords :
Fresnel diffraction; holographic gratings; integrated optics; microactuators; microlenses; optical design techniques; optical filters; optical focusing; optical variables control; silicon; diffractive Fresnel lens; holographic pattern; lens actuation; light focusing; micromechanical lens; near-infrared optical filter; near-infrared spectrometry; reconfigurable optical filter; silicon segments; spectral control; Holography; Lenses; Lighting control; Liquids; Micromechanical devices; Optical diffraction; Optical filters; Silicon; Solids; Spectroscopy; Focusing; gratings; microelectromechanical devices; optical diffraction; optical filters; spectroscopy;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.859186
