2018年第65回応用物理学会春季学術講演会

講演情報

一般セッション(ポスター講演)

3 光・フォトニクス » 3.16 Optics and Photonics English Session

[18p-P10-1~4] 3.16 Optics and Photonics English Session

2018年3月18日(日) 16:00 〜 18:00 P10 (ベルサール高田馬場)

16:00 〜 18:00

[18p-P10-2] Characterization of two-photon exposure patterns in photoresist using photoluminescence quenching

〇(M1)SUBHASHRI CHATTERJEE1、EDY YULIANTO1、IHAR FANIAYEU1、VYGANTAS MIZEIKIS1 (1.Shizuoka University)

キーワード:NANOPHOTONICS, METAMATERIALS

Recently, bi-anisotropic electromagnetic (EM) metamaterials based on 3D helical inclusions were proposed and realized experimentally for infra-red (IR) spectral ranges using Direct Laser Write (DLW) technique[1]. Helix-based perfect absorber (PA) metamaterials are fabricated using DLW in a dielectric photoresist, and the dielectric templates are subsequently metallized using sputtering by gold (Au). PA structures consisting of single micrometer-scale dielectric helices sputtered by about 30-50 nm thick Au film exhibit peak absorbance of 0.7-0.9 at IR wavelengths of 6-9µm. While absorbance bands can be tuned spectrally via templates choice of structural parameters of the dielectric, spectral tuning can be also achieved after the DLW fabrication via gradual increase of the coating thickness. Here we applicability and advantages of this approach. Figure 1 compares experimental absorbance spectra of a helical PA structure before and after the deposition of an additional ≈50 nm thick gold film. As can be seen, augmenting the Au thickness leads to a blue-shift of the absorbance peak wavelength by about 1.5µm. Physical origin and practical exploitation of this spectral shift for versatile post-DLW spectral tuning of PA structures will be discussed.