Title :
Tunable Infrared Microspectrometer Based on Bragg Grating
Author :
Chitteboyina, Murali M. ; Butler, Donald P.
Author_Institution :
Univ. of Texas, Arlington
Abstract :
This paper presents a tunable, microspectrometer, based upon a Bragg diffraction grating structure, capable of operating in the infrared region of the optical spectrum, nominally 1-10 mum. A 10% tunability and 45% absorptivity is reported for a 2.75-mum free space wavelength microspectrometer. It is shown that by changing the position of a reflecting plane below the Bragg grating, there is a change in the absorption wavelength and absorptivity, thereby realizing a tunable spectrometer. The power absorbed is investigated as a function of reflector position using the finite difference time domain method.
Keywords :
Bragg gratings; finite difference time-domain analysis; infrared spectrometers; light diffraction; micro-optomechanical devices; Bragg diffraction; Bragg grating; finite difference time domain method; free space wavelength microspectrometer; infrared microspectrometer; infrared spectrum; tunable microspectrometer; wavelength 1 mum to 10 mum; Bragg gratings; Diffraction gratings; Distributed feedback devices; Infrared spectra; Optical diffraction; Optical filters; Optical interferometry; Optical waveguides; Spectroscopy; Tunable circuits and devices; Bragg grating; micro spectrometer; microelectromechanical;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2007.910703
