Abstract
A miniature optical spectrometer with a thin-film planar waveguide grating coupler in combination with a miniature plano-convex focusing lens has been investigated. With optical part of the spectrometer as small as 0.2 cubic cm, the spectral resolution varies from 0.3 nm to 4.6 nm within the wavelength range 488.0 nm - 632.8 nm.
Highlights
Light-weight, rigid miniature spectrometers with no moving parts are needed for a wide variety of applications including bio-sensors and space applications where every inch of payload counts
In Ref. [14], we have introduced the concept of a microspectrometer based on a diffractive optical element (DOE) integrated with a planar waveguide
The sub-nm resolution for a device of about 1 cm in size of single dimension appears to be at least an order of magnitude better than the resolution of microspectrometers described in literature so far
Summary
Light-weight, rigid miniature spectrometers with no moving parts are needed for a wide variety of applications including bio-sensors and space applications where every inch of payload counts. Two other grating-based visible and infrared microspectrometers of sizes of single dimension only a few millimeters have been demonstrated to give a FWHM of ~ 60nm at 600 nm and ~500 nm at 5 μm respectively [7]. The sub-nm resolution for a device of about 1 cm in size of single dimension appears to be at least an order of magnitude better than the resolution of microspectrometers described in literature so far. This motivates to study the device operation further i.e., at other wavelengths and in a wide spectral range. We experimentally determine the resolution of the miniature spectrometer in three different configurations each employing a lens of different focal length
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