Design of compact dual‐core terahertz polarization beam splitter with broad bandwidth

Abstract

A novel dual-core structure based on cyclic olefin copolymer (COC) photonic crystal fiber (PCF) is proposed for realizing Terahertz (THz) polarization beam splitting. The dependence of coupling length and structural parameters of the THz polarization beam splitter (TPBS) is analyzed. The confinement loss, effective material loss, and extinction ratio (ER) are examined. The numerical simulation results show, two orthogonal polarization modes are separated completely within a device length of only 45.16 mm owing to the different coupling length in x-and y-polarization directions. The maximum polarization ER of 107.7 dB is obtained at 0.54 THz. The bandwidth with ER greater than 20 dB reaches 0.02 THz. The proposed compact dual-core TPBS will find extensive applications in THz photonic systems.

Deep‐subwavelength characteristics of focused vector double‐petal linear edge dislocation beams

“…24 Based on the shape of the incision, the edge wavefront dislocations singularities are categorized into linear and circular edge dislocations. 25 Singular beams have highly significant applications in optical tweezers, 26,27 optical communications, 28,29 information storage, 30 optical detection and sensing, [31][32][33][34] and many other fields due to their special phase distributions. 35,36 In this work, we focus on the investigation of the double-petal linear edge dislocation (DPLED) beams, which can be obtained by superposing two vortex beams with opposite topological charges.…”

“…Based on the shape of the incision, the edge wavefront dislocations singularities are categorized into linear and circular edge dislocations 25 . Singular beams have highly significant applications in optical tweezers, 26,27 optical communications, 28,29 information storage, 30 optical detection and sensing, 31–34 and many other fields due to their special phase distributions 35,36 …”

Design of a photonic crystal fiber polarization beam splitter with simple structure and ultra-wide bandwidth

“…[1][2][3][4][5] It is mainly used to separate the light beams in the orthogonal polarization directions. [6][7][8][9] Over the past two decades, photonic crystal fiber (PCFs) have received great attention due to their unique optical characteristics. [10][11][12][13][14] In recent years, some researches have concentrated on the PBSs based on the dual-core PCFs (DC-PCFs).…”