Opto-Electronics


MOEMS-based mini spectrometer

27 May 2009 Opto-Electronics

Hamamatsu Photonics recently introduced the C10988MA, a unique, ultra-compact spectrometer built using MOEMS (micro opto-electromechanical systems) technology. The C10988MA is a thumb-sized device, measuring only 27,6 x 13 x 16,8 mm, developed for use in portable and handheld devices, where a standard mini-spectrometer would be too large and consume too much power. Not only small, the device is also light, weighing only 9 grams.

To achieve such a small size required the combination of Hamamatsu’s MEMS and image sensor technologies. The new device uses an aberration-corrected concave grating with a very short focal length, and a blazed grating profile for high diffraction efficiency. The grating is replicated onto the top of a convex glass lens using nanoprint technology. Directly opposite the grating is placed a dedicated CMOS silicon image sensor with an on-chip slit. This 75 μm x 750 μm slit is formed into the CMOS chip using MEMS technology. The distance between the sensor and slit is only 1 mm, whilst the grating to image sensor distance is 8,5 mm.

Through the use of these novel techniques, the C10988MA can offer a spectral resolution of 12 nm in the wavelength range of 340 nm to 750 nm, making it suitable for a range of ­visible light applications requiring a miniaturised spectrometer head.



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