TY - JOUR
T1 - Inward electromagnetic wave coupling in hybrid subwavelength structures illuminated with secondary imaging
AU - Hong, Jian Shiung
AU - Chen, Kuan Ren
N1 - Funding Information:
The authors are grateful for support from Ministry of Science and Technology, Taiwan , ROC [grand numbers MOST 104–2112-M-006–004-MY3, 107–2112-M-006–011, 108–2112-M-006–014 ] and computational resources at National Center for High-performance Computing at National Applied Research Laboratories.
Publisher Copyright:
© 2021
PY - 2021/8
Y1 - 2021/8
N2 - Subwavelength structures hybridized with slits and grooves in metallic films exhibit extraordinary optical properties for manipulation of light. A Green method is developed to investigate the wave coupling physics in the hybrid subwavelength structures, while source-image arrangement in bounded spaces is employed to obtain the Green's functions for the hybrid units. We find that secondary imaging is induced at a horizontal boundary to provide an inward wave propagation mechanism to couple the wave scattered by groove back into slit. Sophisticated self-consistent framework derived from our method that involves the wave couplings is then developed to study the physics origin of the extraordinary optical properties. The case of a slit in a metal film with patterned grooves on the output side for beaming and that of a two-layer metal film with indented double slit for beyond-limit focusing are analyzed. Our Green method, which automatically includes the Fourier high-order modes, is concise in formulation and thus yields accurate solutions. Explicit analytical models are rigorously developed to address wave coupling physics problems in subwavelength structure.
AB - Subwavelength structures hybridized with slits and grooves in metallic films exhibit extraordinary optical properties for manipulation of light. A Green method is developed to investigate the wave coupling physics in the hybrid subwavelength structures, while source-image arrangement in bounded spaces is employed to obtain the Green's functions for the hybrid units. We find that secondary imaging is induced at a horizontal boundary to provide an inward wave propagation mechanism to couple the wave scattered by groove back into slit. Sophisticated self-consistent framework derived from our method that involves the wave couplings is then developed to study the physics origin of the extraordinary optical properties. The case of a slit in a metal film with patterned grooves on the output side for beaming and that of a two-layer metal film with indented double slit for beyond-limit focusing are analyzed. Our Green method, which automatically includes the Fourier high-order modes, is concise in formulation and thus yields accurate solutions. Explicit analytical models are rigorously developed to address wave coupling physics problems in subwavelength structure.
UR - https://www.scopus.com/pages/publications/85145821349
UR - https://www.scopus.com/pages/publications/85145821349#tab=citedBy
U2 - 10.1016/j.cjph.2021.01.013
DO - 10.1016/j.cjph.2021.01.013
M3 - Article
AN - SCOPUS:85145821349
SN - 0577-9073
VL - 72
SP - 688
EP - 699
JO - Chinese Journal of Physics
JF - Chinese Journal of Physics
ER -