Graphene Oxide Waveguide and Micro‐Ring Resonator Polarizers. Issue 9 (13th August 2019)

• Record Type: Journal Article
• Authors: Wu, Jiayang; Yang, Yunyi; Qu, Yang; Xu, Xingyuan; Liang, Yao; Chu, Sai Tak; Little, Brent E.; Morandotti, Roberto; Jia, Baohua; Moss, David J.
• Is Part Of: Laser & photonics reviews. Volume 13:Issue 9(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-13
• Subjects: 2D materials -- graphene oxide -- integrated photonics -- material anisotropy -- polarization control; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.201900056
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: Integrated waveguide polarizers and polarization‐selective micro‐ring resonators (MRRs) incorporated with graphene oxide (GO) films are experimentally demonstrated. CMOS‐compatible doped silica waveguides and MRRs with both uniformly coated and patterned GO films are fabricated based on a large‐area, transfer‐free, layer‐by‐layer GO coating method that yields precise control of the film thickness. Photolithography and lift‐off processes are used to achieve photolithographic patterning of GO films with precise control of the placement and coating length. Detailed measurements are performed to characterize the performance of the devices versus GO film thickness and coating length as a function of polarization, wavelength and power. A high polarization dependent loss of ≈53.8 dB is achieved for the waveguide coated with 2‐mm‐long patterned GO films. It is found that intrinsic film material loss anisotropy dominates the performance for less than 20 layers whereas polarization‐dependent mode overlap dominates for thicker layers. For the MRRs, the GO coating length is reduced to 50 µm, yielding a ≈8.3 dB polarization extinction ratio between transverse electric (TE) and transverse magnetic (TM) resonances. These results offer interesting physical insights and trends of the layered GO films and demonstrate the effectiveness of introducing GO films into photonic‐integrated devices to realize high‐performance polarization selective components. Abstract : Integrated waveguide polarizers and polarization‐selective micro‐ring resonators incorporated with layered graphene oxide (GO) films are experimentally demonstrated. Precise control of thickness, placement, and coating length of GO films is achieved. The high performance of the devices is characterized. The interesting physical insights and trends of the layered GO films from monolayer to quasi‐ bulk‐like behavior are also analyzed.