Abstract
A broadband and compact TE-pass/TM-stop polarizer is presented based on hybrid plasmonic grating (HPG) on an x-cut Lithium-Niobate-on-isolator (LNOI) platform. By comprehensively analyzing the effects of metal width on mode effective index, mode similarity, and mode conversion, we demonstrate the structure with a narrow metal layer. The simulation results indicate that the polarizer with a compact length of 9 μm achieves an extinction ratio over 20 dB within the wavelength range from 1470 nm to 1700 nm. The insertion loss is below 2.3 dB in C-band. Furthermore, the polarizer exhibits large fabrication tolerance to current fabrication technology.
Highlights
Lithium-Niobate-on-isolator (LNOI) is a promising platform because of remarkable electrooptic property, acousto-optic and nonlinear optical properties for integrated photonics as conventional bulk LiNbO3, and owing to its potential broad application in integrated optics with high index contrast, small footprint compared to bulk LiNbO3 and compatibility with available complementary metal-oxide-semiconductor (CMOS) fabrication process [1]–[3]
By comprehensively analyzing the effects of metal width on mode effective index, mode similarity, and mode conversion, we demonstrate the structure with a narrow metal layer
TM0 mode is predominant in the output when the wavelength is shorter than 1500 nm, while TE1 is leading when the wavelength is larger than 1600 nm, and the output is a superposition of two modes within (1500, 1600) nm
Summary
Lithium-Niobate-on-isolator (LNOI) is a promising platform because of remarkable electrooptic property, acousto-optic and nonlinear optical properties for integrated photonics as conventional bulk LiNbO3, and owing to its potential broad application in integrated optics with high index contrast, small footprint compared to bulk LiNbO3 and compatibility with available complementary metal-oxide-semiconductor (CMOS) fabrication process [1]–[3]. The dielectric-based polarizer has been developed to achieve high extinction ratio (ER) and low insertion loss (IL) [4]–[8]. These polarizers usually utilize shallow-etched waveguide or subwavelength grating waveguide to accomplish large leakage loss. Such polarizers always suffer a large size, complicated structure, and high sensitivity to fabrication. Hybrid plasmonic grating (HPG) is a more practical solution to realize high-performance polarizers with interactions of reflection and mode mismatch [18]–[22].
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