Rotation-Symmetric Multispot Focusing Phase-Shifted Grating Coupler for Integrated Semiconductor Laser

Uenishi, Kengo; Uemukai, Masahiro; Suhara, Toshiaki

doi:10.1143/jjap.51.058001

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Designing and manufacturing 3D polymerized structures for beam modulation is more challenging in an integrated optics framework. In most research reports, including distributed Bragg reflector (DBR) laser-based optics where the periodicity of grating elements is parallel to the beam propagation [4], and cases where the periodicity is perpendicular to the beam propagation [5], binary elements are manufactured. This is because the short integration distance often demands short period grating elements, and achieving multiple levels within that short period is challenging.…”

Section: Of 14mentioning

confidence: 99%

Fraxicon for Optical Applications with Aperture ∼1 mm

Mu,

Smith,

et al. 2023

Preprint

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Emerging applications of optical technologies are driving the development of miniaturised light sources, which in turn require the fabrication of matching micro-optical elements with sub-1 mm cross sections and high optical quality. This is particularly challenging for spatially-constrained biomedical applications where reduced dimensionality is required, such as endoscopy, optogenetics, or optical implants. Planarisation of a lens by the Fresnel lens approach was adapted for a conical lens (axicon) and was made by direct femtosecond 780 nm/100 fs laser writing in SZ2080™polymer with photo-initiator. Optical characterisation of the positive and negative fraxicons is presented. Numerical modeling of fraxicon optical performance under illumination by incoherent and spatially extended light sources is compared with the ideal case of plane wave illumination. Considering the potential for rapid replication in soft polymers and resists, this approach holds great promise for the most demanding technological applications.

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Section: Of 14mentioning

confidence: 99%

Fraxicon for Optical Applications with Aperture ∼1 mm

Mu,

Smith,

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Designing and manufacturing 3D polymerised structures for beam modulation is more challenging in an integrated optics framework. In most research reports, including distributed Bragg reflector (DBR) laser-based optics, where the periodicity of grating elements is parallel to the beam propagation [52], and cases where the periodicity is perpendicular to the beam propagation [53], binary elements are manufactured. This is because the short integration distance often demands short-period grating elements, and achieving multiple levels within that short period is challenging.…”

Section: Introductionmentioning

confidence: 99%

Fraxicon for Optical Applications with Aperture ∼1 mm: Characterisation Study

Mu,

Smith,

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Emerging applications of optical technologies are driving the development of miniaturised light sources, which in turn require the fabrication of matching micro-optical elements with sub-1 mm cross-sections and high optical quality. This is particularly challenging for spatially constrained biomedical applications where reduced dimensionality is required, such as endoscopy, optogenetics, or optical implants. Planarisation of a lens by the Fresnel lens approach was adapted for a conical lens (axicon) and was made by direct femtosecond 780 nm/100 fs laser writing in the SZ2080™ polymer with a photo-initiator. Optical characterisation of the positive and negative fraxicons is presented. Numerical modelling of fraxicon optical performance under illumination by incoherent and spatially extended light sources is compared with the ideal case of plane-wave illumination. Considering the potential for rapid replication in soft polymers and resists, this approach holds great promise for the most demanding technological applications.

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Rotation-Symmetric Multispot Focusing Phase-Shifted Grating Coupler for Integrated Semiconductor Laser

Abstract: Rotation-symmetric multispot focusing grating couplers with periodic binary phase modulation are designed and fabricated. The functions of 60 and 45° rotation-symmetric multispot focusing with the same spot intensities were demonstrated.

Cited by 2 publications

References 6 publications

Fraxicon for Optical Applications with Aperture ∼1 mm

Fraxicon for Optical Applications with Aperture ∼1 mm

Fraxicon for Optical Applications with Aperture ∼1 mm: Characterisation Study

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