Modulated photonic-crystal surface-emitting laser with elliptical lattice points for two-dimensional coupling enhancement

Yoshinori Tanaka,Kyoko Kitamura,John Gelleta,Susumu Noda,Atsuki Nishigo

doi:10.1063/1.5084287

Yoshinori Tanaka, Kyoko Kitamura + Show 3 more

Open Access

https://doi.org/10.1063/1.5084287

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Journal: AIP Advances	Publication Date: Nov 1, 2019
Citations: 8	License type: cc-by

Affiliation: Kyoto University, Kyoto Institute of Technology

Abstract

Modulated photonic-crystal surface-emitting lasers (M-PCSELs) are new semiconductor lasers that can emit a laser beam in arbitrary directions. Therefore, they can be regarded as a next-generation light source for light detection and ranging. In this manuscript, we numerically investigate the characteristics of M-PCSELs, including one- and two-dimensional optical coupling constants and radiation constants, by using three-dimensional coupled wave theory. We also carry out lattice point designs and show that the two-dimensional optical coupling can be enhanced by more than four times over our previous M-PCSEL devices by employing elliptical lattice points. Moreover, we find that two-dimensional optical coupling can be maintained even when large lattice point position modulations are introduced for large radiation constants. These results indicate that more stable two-dimensional oscillation and a higher slope efficiency are expected in M-PCSELs with elliptical lattice points.

Highlights

Light detection and ranging (LiDAR)1–3 is attracting considerable attention as it is required for various applications including self-driving cars,4–6 autonomous mobile robots,7,8 and security sensing
It appears that the photonic crystals do not have any periodicity, but in actuality, the air hole positions are modulated by shifting them by a distance (d) and at an angle (ψ) from the original lattice position (r); this modulation allows the laser beam to be emitted in arbitrary directions
We investigate the effect of the lattice position modulation on radiation constants and optical coupling constants in M-PCSELs

Summary

Introduction

Light detection and ranging (LiDAR)1–3 is attracting considerable attention as it is required for various applications including self-driving cars,4–6 autonomous mobile robots,7,8 and security sensing.

Results

Conclusion