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Photonic Nanojet Generation Using Integrated Silicon Photonic Chip with Hemispherical Structures

Photonic Nanojet Generation Using Integrated Silicon Photonic Chip with Hemispherical Structures
Photonic Nanojet Generation Using Integrated Silicon Photonic Chip with Hemispherical Structures
Photonic nanojet (PNJ) is a tightly focused diffractionless travelling beam generated by dielectric microparticles. The location of the PNJ depends on the refractive index of the material and it usually recedes to the interior of the microparticle when the refractive index is higher than 2, making high index materials unsuitable to produce useful PNJs while high index favours narrower PNJs. Here we demonstrate a design of CMOS compatible high index on-chip photonic nanojet based on silicon. The proposed design consists of a silicon hemisphere on a silicon substrate. The PNJs generated can be tuned by changing the radius and sphericity of the hemisphere. Oblate spheroids generate PNJs further away from the refracting surface and the PNJ length exceeds 17λ when the sphericity of the spheroid is 2.25 The proposed device can have potential applications in focal plane arrays, enhanced Raman spectroscopy, and optofluidic chips.
Microlens, Nanojet, Photonic jet, Silicon photonics
2304-6732
Veluthandath, Aneesh V.
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Veluthandath, Aneesh V.
6a183413-e10f-4374-bc64-a33bf7fd9cfa
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b

Veluthandath, Aneesh V. and Murugan, Ganapathy Senthil (2021) Photonic Nanojet Generation Using Integrated Silicon Photonic Chip with Hemispherical Structures. Photonics, 8 (12), [586]. (doi:10.3390/photonics8120586).

Record type: Article

Abstract

Photonic nanojet (PNJ) is a tightly focused diffractionless travelling beam generated by dielectric microparticles. The location of the PNJ depends on the refractive index of the material and it usually recedes to the interior of the microparticle when the refractive index is higher than 2, making high index materials unsuitable to produce useful PNJs while high index favours narrower PNJs. Here we demonstrate a design of CMOS compatible high index on-chip photonic nanojet based on silicon. The proposed design consists of a silicon hemisphere on a silicon substrate. The PNJs generated can be tuned by changing the radius and sphericity of the hemisphere. Oblate spheroids generate PNJs further away from the refracting surface and the PNJ length exceeds 17λ when the sphericity of the spheroid is 2.25 The proposed device can have potential applications in focal plane arrays, enhanced Raman spectroscopy, and optofluidic chips.

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More information

Accepted/In Press date: 15 December 2021
Published date: 17 December 2021
Keywords: Microlens, Nanojet, Photonic jet, Silicon photonics

Identifiers

Local EPrints ID: 453164
URI: http://eprints.soton.ac.uk/id/eprint/453164
ISSN: 2304-6732
PURE UUID: 1da22b16-e4c8-488f-a032-ac172865f948
ORCID for Aneesh V. Veluthandath: ORCID iD orcid.org/0000-0003-4306-6723
ORCID for Ganapathy Senthil Murugan: ORCID iD orcid.org/0000-0002-2733-3273

Catalogue record

Date deposited: 10 Jan 2022 17:50
Last modified: 17 Mar 2024 04:00

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