Numerical analysis of artificial optical activities of planar chiral nano-gratings

Yasuo Ohtera

doi:10.1587/transele.E97.C.33

Numerical analysis of artificial optical activities of planar chiral nano-gratings

Yasuo Ohtera

ENG - Communications Engineering

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

2 Citations (Scopus)

Abstract

We analyzed polarization characteristics of gammadionshaped planar chiral nano-gratings (PCNGs), using Jonesmatrix and FDTD simulation. Optical activity (OA) was found to take place at wavelengths where long-lifetime modes appeared in the chiral layer. Among two kinds of resonance phenomena that concern the extension of the lifetime, guidedmode resonance and Fabry-Perot resonance, the latter was found to be a key to generate practically-important, broad peaks in the OA spectrum. Through the calculation of dispersion relations of Bloch modes in the chiral layer, we showed that the interference of multiple modes with group velocity dispersion played a critical role in the generation of such long-lifetime modes.

Original language	English
Pages (from-to)	33-39
Number of pages	7
Journal	IEICE Transactions on Electronics
Volume	E97-C
Issue number	1
DOIs	https://doi.org/10.1587/transele.E97.C.33
Publication status	Published - 2014 Jan

Keywords

Chiral grating
Guided mode resonance
Optical activity
Photonic band structure
Sub-wavelength grating

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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abstract = "We analyzed polarization characteristics of gammadionshaped planar chiral nano-gratings (PCNGs), using Jonesmatrix and FDTD simulation. Optical activity (OA) was found to take place at wavelengths where long-lifetime modes appeared in the chiral layer. Among two kinds of resonance phenomena that concern the extension of the lifetime, guidedmode resonance and Fabry-Perot resonance, the latter was found to be a key to generate practically-important, broad peaks in the OA spectrum. Through the calculation of dispersion relations of Bloch modes in the chiral layer, we showed that the interference of multiple modes with group velocity dispersion played a critical role in the generation of such long-lifetime modes.",

keywords = "Chiral grating, Guided mode resonance, Optical activity, Photonic band structure, Sub-wavelength grating",

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AU - Ohtera, Yasuo

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N2 - We analyzed polarization characteristics of gammadionshaped planar chiral nano-gratings (PCNGs), using Jonesmatrix and FDTD simulation. Optical activity (OA) was found to take place at wavelengths where long-lifetime modes appeared in the chiral layer. Among two kinds of resonance phenomena that concern the extension of the lifetime, guidedmode resonance and Fabry-Perot resonance, the latter was found to be a key to generate practically-important, broad peaks in the OA spectrum. Through the calculation of dispersion relations of Bloch modes in the chiral layer, we showed that the interference of multiple modes with group velocity dispersion played a critical role in the generation of such long-lifetime modes.

AB - We analyzed polarization characteristics of gammadionshaped planar chiral nano-gratings (PCNGs), using Jonesmatrix and FDTD simulation. Optical activity (OA) was found to take place at wavelengths where long-lifetime modes appeared in the chiral layer. Among two kinds of resonance phenomena that concern the extension of the lifetime, guidedmode resonance and Fabry-Perot resonance, the latter was found to be a key to generate practically-important, broad peaks in the OA spectrum. Through the calculation of dispersion relations of Bloch modes in the chiral layer, we showed that the interference of multiple modes with group velocity dispersion played a critical role in the generation of such long-lifetime modes.

KW - Chiral grating

KW - Guided mode resonance

KW - Optical activity

KW - Photonic band structure

KW - Sub-wavelength grating

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