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High-performance asymmetric optical transmission based on coupled complementary subwavelength gratings
Shuang Li1, Li-Rong Huang2, Yong-Hong Ling1
1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Rd, Wuhan, 430074, China.
Scientific Reports
|November 21, 2019
Summary
This study introduces a novel asymmetric transmission (AT) device using coupled gratings and an asymmetric dielectric environment. It achieves high forward transmittance and broad bandwidth for optical computing applications.
Area of Science:
- Optics
- Plasmonics
- Nanophotonics
Background:
- Asymmetric transmission (AT) devices are crucial for optical computing and information processing.
- Existing AT devices often face limitations in performance and bandwidth.
Purpose of the Study:
- To propose and investigate a novel AT device based on coupled complementary subwavelength gratings.
- To enhance AT performance by exploiting near-field coupling and asymmetric dielectric environments.
Main Methods:
- Design of an AT device with coupled complementary subwavelength gratings.
- Employing an asymmetric dielectric environment for unidirectional surface plasmon polariton (SPP) excitation.
- Investigating near-field coupling effects, dielectric asymmetry, and dipole moment interactions.
Main Results:
- Achieved high forward transmittance of 0.96.
- Demonstrated a broad operational bandwidth of 174 nm at a wavelength of 1250 nm.
- Uncovered the mechanism behind AT performance enhancement through near-field coupling.
Conclusions:
- The proposed device offers a new pathway to high-performance AT devices.
- The study deepens the understanding of near-field coupling in complementary structures.
- Expanded applications for AT devices in optical information processing.
