Abstract
This study demonstrates the high sensitivity of high Q polymeric planar waveguide refractive index sensors used on the evanescent field. A Fabry-Perot Bragg gratings cavity was fabricated with a cavity size of 5 mm and 7 mm, respectively. The spectra of light reflected from fabricated Bragg gratings, which were butt-joined, were measured and compared with different indices of surrounding media. It was confirmed the FP Bragg gratings cavity is more sensitive than the single Bragg grating. The sensor developed in this study shows much promise in the application of biomedical diagnostics such as a bio-sensor and/or environmental monitoring systems.
Highlights
Planar optical waveguide gratings have been used in variety of applications for optical components like couplers, beam splitters, modulators, filters, and sensors, etc.[1,2] These devices are used to control lasers, spectrometers, and the measurement of the wavelength of light in a wide variety of fields
Atomic Force Microscopy (AFM) image of Bragg grating was shown with magnification
It was found that the long-length grating caused significant reflection of light from the first Bragg grating and the interference between two gratings could not be made without sufficient light transmission from the first grating
Summary
Planar optical waveguide gratings have been used in variety of applications for optical components like couplers, beam splitters, modulators, filters, and sensors, etc.[1,2] These devices are used to control lasers, spectrometers, and the measurement of the wavelength of light in a wide variety of fields. Since the 1990s, optical waveguide Bragg gratings have been employed in optical sensors to measure both the mechanical and electrical conditions. This allows for the smaller footprint, lower weight, and simplification of measurement systems, in particular, because the resultant measurements can be encoded by Bragg resonance wavelength. We typically etch our sensor down to a diameter of 5 μm and can detect a wavelength change of 1 pm or less in the center frequency of our Bragg grating sensor We have used this sensor to detect monolayer deposition of small molecules of mass of order 250 Da. In particular, we have studied the real-time attachment of one monolayer of 3-Aminopropyltriethoxysilane (APTES) and 3-aminopropyl-methyl diethoxysilane (APMDS) on the sensor and have demonstrated the formation of a water layer on the sensor.
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