In:
Optics Letters, Optica Publishing Group, Vol. 47, No. 3 ( 2022-02-01), p. 561-
Abstract:
We demonstrate a Si/SiO/SiO 2 -based period-chirped guided
mode resonance (GMR) filter to discriminate telecom o-band wavelengths by spatially resolved horizontal movement. Continuously period-chirped
silicon gratings were fabricated by using a Lloyd’s laser interferometer with a convex mirror. Due to the large waveguide
effective index, the GMR filter can be realized with a short grating period, thus enabling a slow grating period transition along the
sample position and high optical resolution in wavelength discrimination. Depositing a SiO/SiO 2 stack on top of
silicon gratings enables a narrowband GMR filter with a linewidth of 1–1.5 nm over a wavelength range of 1260–1360 nm. By using the chirped
GMR filter as a dispersive device, the optical spectra of a near-infrared broadband light source are reconstructed. An optimized
aspheric mirror is proposed to further improve the linearity of chirped gratings. Such a period-chirped GMR filter is promising for
compact on-chip spectroscopy and sensing applications.
Type of Medium:
Online Resource
ISSN:
0146-9592
,
1539-4794
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2022
detail.hit.zdb_id:
243290-0
