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High contrast grating VCSELs for sensing applications
- Source :
- SPIE Proceedings.
- Publication Year :
- 2017
- Publisher :
- SPIE, 2017.
-
Abstract
- High Contrast Gratings (HCGs) become an attractive alternative for Distributed Bragg Reflectors (DBRs) used as high reflecting mirrors for VCSELs. In this paper we propose to implement HCG or monolithic HCG as a top mirror of the 1650nm InP-based VCSEL intended for use as a methane sensing device. Its unique feature is related to the fact that light taking part in the resonance can be accessed without opening the laser cavity due to the slow light phenomenon which occurs in HCG. Particular designs of HCGs allow to concentrate significant part of the mode between the HCG stripes. In such constructions the presence of the substance in the vicinity of the HCG which interacts with light resonating in the laser will change its emission properties. This enables sensing absorption or change to the refractive index in proximity of the laser based on the emission parameters of the laser. We present a numerical analysis of 1650nm MHCG and HCG mirrors based on fully vectorial optical model. We found optimal parameters of HCGs and MHCGs to detect absorption and refractive index variations in the vicinity of the gratings, based on changes in power reflectance of analysed mirrors. Additionally we consider HCG and MHCG constructions which allow for broad wavelength tuning by the change of the refractive index of substance surrounding mirror.
- Subjects :
- Materials science
02 engineering and technology
Grating
sensors
Slow light
WAVELENGTH
01 natural sciences
Subwavelength gratings
law.invention
Vertical-cavity surface-emitting laser
010309 optics
020210 optoelectronics & photonics
Optics
law
0103 physical sciences
0202 electrical engineering, electronic engineering, information engineering
Electrical and Electronic Engineering
Absorption (electromagnetic radiation)
business.industry
Applied Mathematics
Condensed Matter Physics
Laser
MIRROR
Electronic, Optical and Magnetic Materials
Computer Science Applications
Wavelength
Optical cavity
Optoelectronics
REFRACTIVE-INDEX
business
vertical-cavity surface-emitting lasers
Refractive index
Subjects
Details
- ISSN :
- 0277786X
- Database :
- OpenAIRE
- Journal :
- SPIE Proceedings
- Accession number :
- edsair.doi.dedup.....9d4db69f352a3c170b6bc8a6ac316d70