Ultra-Sensitivity Widefield, Confocal Surface Plasmon Interferometry Using Sequential Coding Topics: Biomedical Optics; Computational Optical Sensing and Imaging; Optical Instrumentation and Signal Processing; Spectroscopy, Imaging and Metrology In Proceedings of the 11th International Conference on Photonics, Optics and Laser Technology PHOTOPTICS - Volume 1, 96-101, 2023 , Lisbon, Portugal