Numerical simulation of optical sensing by the far field pattern radiated by periodic grating strips over silica buffer on the silicon wire waveguide

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Numerical simulation of optical sensing by the far field pattern radiated by periodic grating strips over silica buffer on the silicon wire waveguide. / Tsarev, Andrei; Passaro, Vittorio M.N.

In: Sensors (Switzerland), Vol. 20, No. 18, 5306, 16.09.2020, p. 1-8.

Research output: Contribution to journal › Letter › peer-review

BibTeX

@article{ec3457b0f70e4894bea43a66f00cf045,

title = "Numerical simulation of optical sensing by the far field pattern radiated by periodic grating strips over silica buffer on the silicon wire waveguide",

abstract = "This paper presents results of numerical modeling of a modified design of an optical sensor based on segmented periodic silicon oxynitride (SiON) grating evanescently coupled with silicon wire. This segmented grating works as a leaky waveguide, which filters input power from a broadband optical source and radiates it as an outcoming optical beam with both a small wavelength band and a small beam divergence. The radiation angle strongly depends on the refractive index of the grating environment and provides sensor interrogation by measuring the far field pattern in the focal plane of the lens, which is placed near the sensor element. The device concept was verified by direct numerical modeling through the finite difference time domain (FDTD) method and provided moderate intrinsic limit of detection (iLOD) ~ 0.004 RIU with a possible iLOD ~ 0.001 RIU for 10 mm‐long structures.",

keywords = "Far field pattern, Finite difference time domain (FDTD) method, Numerical modeling, Optical sensors, Segmented grating, Silicon oxynitride (SiON), Silicon wire, far field pattern, DESIGN, silicon oxynitride (SiON), silicon wire, optical sensors, COUPLER, MICRORING RESONATOR, PHASE, EFFECTIVE-INDEX METHOD, finite difference time domain (FDTD) method, BIOSENSOR, segmented grating, numerical modeling",

author = "Andrei Tsarev and Passaro, {Vittorio M.N.}",

year = "2020",

month = sep,

day = "16",

doi = "10.3390/s20185306",

language = "English",

volume = "20",

pages = "1--8",

journal = "Sensors",

issn = "1424-3210",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "18",

}

RIS

TY - JOUR

T1 - Numerical simulation of optical sensing by the far field pattern radiated by periodic grating strips over silica buffer on the silicon wire waveguide

AU - Tsarev, Andrei

AU - Passaro, Vittorio M.N.

PY - 2020/9/16

Y1 - 2020/9/16

N2 - This paper presents results of numerical modeling of a modified design of an optical sensor based on segmented periodic silicon oxynitride (SiON) grating evanescently coupled with silicon wire. This segmented grating works as a leaky waveguide, which filters input power from a broadband optical source and radiates it as an outcoming optical beam with both a small wavelength band and a small beam divergence. The radiation angle strongly depends on the refractive index of the grating environment and provides sensor interrogation by measuring the far field pattern in the focal plane of the lens, which is placed near the sensor element. The device concept was verified by direct numerical modeling through the finite difference time domain (FDTD) method and provided moderate intrinsic limit of detection (iLOD) ~ 0.004 RIU with a possible iLOD ~ 0.001 RIU for 10 mm‐long structures.

AB - This paper presents results of numerical modeling of a modified design of an optical sensor based on segmented periodic silicon oxynitride (SiON) grating evanescently coupled with silicon wire. This segmented grating works as a leaky waveguide, which filters input power from a broadband optical source and radiates it as an outcoming optical beam with both a small wavelength band and a small beam divergence. The radiation angle strongly depends on the refractive index of the grating environment and provides sensor interrogation by measuring the far field pattern in the focal plane of the lens, which is placed near the sensor element. The device concept was verified by direct numerical modeling through the finite difference time domain (FDTD) method and provided moderate intrinsic limit of detection (iLOD) ~ 0.004 RIU with a possible iLOD ~ 0.001 RIU for 10 mm‐long structures.

KW - Far field pattern

KW - Finite difference time domain (FDTD) method

KW - Numerical modeling

KW - Optical sensors

KW - Segmented grating

KW - Silicon oxynitride (SiON)

KW - Silicon wire

KW - far field pattern

KW - DESIGN

KW - silicon oxynitride (SiON)

KW - silicon wire

KW - optical sensors

KW - COUPLER

KW - MICRORING RESONATOR

KW - PHASE

KW - EFFECTIVE-INDEX METHOD

KW - finite difference time domain (FDTD) method

KW - BIOSENSOR

KW - segmented grating

KW - numerical modeling

UR - http://www.scopus.com/inward/record.url?scp=85090891002&partnerID=8YFLogxK

U2 - 10.3390/s20185306

DO - 10.3390/s20185306

M3 - Letter

C2 - 32948039

AN - SCOPUS:85090891002

VL - 20

SP - 1

EP - 8

JO - Sensors

JF - Sensors

SN - 1424-3210

IS - 18

M1 - 5306

ER -

ID: 25293109