Interferenceless polarization splitting through nanoscale van der Waals heterostructures

• Main Authors: Shah, Shahnawaz, Lin, Xiao, Shen, Lian, Renuka, Maturi, Zhang, Baile, Chen, Hongsheng
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2018
• Subjects: Polarization Splitting; Van der Waals Heterostructures; DRNTU::Science::Physics
• Online Access: https://hdl.handle.net/10356/89693; http://hdl.handle.net/10220/46329
• Institution: Nanyang Technological University

The ability to control the polarization of light at the extreme nanoscale has long been a major scientific and technological goal for photonics. Here we predict the phenomenon of polarization splitting through van der Waals heterostructures of nanoscale thickness, such as graphene-hexagonal boron nitride heterostructures, at infrared frequencies (near 25.35 THz). The underlying mechanism is that the designed heterostructures possess an effective relative permittivity with its in-plane (out-of-plane) component being unity (zero); such heterostructures are transparent to transverse-electric (TE) waves while opaque to transverse-magnetic (TM) waves, without resorting to the interference effect. Moreover, the predicted phenomenon is insensitive to incident angles. Our work thus indicates that van der Waals heterostructures are a promising nanoscale platform for the manipulation of light, such as the design of polarization beam nanosplitters and ε-near-zero materials, and the exploration of superscattering for TM waves and zero scattering for TE waves from deep-subwavelength nanostructures.