HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Highly Angular Tolerant Transmission Filters for Narrow-Band Image Sensors

Abstract : A dielectric transmittance filter composed of subwavelength grating sandwiched between two few-layers distributed Bragg reflectors (DBRs) is proposed with the aim of being compatible with CMOS technology and to be tunable by lithographic means of the grating pattern without the need of thickness changes, in the broad spirit of metamaterials. The DBR mirrors form a Fabry-Perot (FP) cavity whose resonant frequency can be tuned by changing the effective refractive index of the cavity, here, by tailoring the in-plane filling factor of the grating. The structure has been studied and designed by performing numerical simulations using Fourier Modal Method (FMM). This filter proves to have high broad angular tolerance up to ±30˚. This feature is crucial for evaluating the spectral performance of narrow-band filters especially the so-called Ambient light sensors (ALS). By analyzing the transmittance spectral distributions in the band diagram, it is found that the angular tolerance is due to coupling between the FP and the guided mode inside the cavity in analogy to resonances occurring within multimode periodic waveguides in a different context.
Complete list of metadata

https://hal-iogs.archives-ouvertes.fr/hal-03380735
Contributor : Christophe Sauvan Connect in order to contact the contributor
Submitted on : Friday, October 15, 2021 - 5:30:13 PM
Last modification on : Tuesday, January 4, 2022 - 6:04:57 AM
Long-term archiving on: : Sunday, January 16, 2022 - 9:19:54 PM

File

omeis_opj_21.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Fatima Omeis, Mondher Besbes, Christophe Sauvan, H. Benisty. Highly Angular Tolerant Transmission Filters for Narrow-Band Image Sensors. Optics and Photonics Journal, Scientific Research Publishing, 2021, 11 (6), pp.140 - 151. ⟨10.4236/opj.2021.116012⟩. ⟨hal-03380735⟩

Share

Metrics

Record views

12

Files downloads

13