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All-optical computing has recently emerged as a vibrant research field inresponse to the energy crisis and the growing demand for informationprocessing. However, the efficiency of subwavelength-scale all-optical devicesremains relatively low due to challenges such as back-scattering reflectionsand strict surface roughness. Furthermore, achieving multifunctionality throughthe reassembly of all-optical structures has thus far been rarely accomplished.One promising approach to address these issues is the utilization of one-wayedge modes. In this study, we propose four types of deep-subwavelength ($\sim10^{-2} \lambda_0$, where $\lambda_0$ is the wavelength in vacuum) all-opticalfunctional devices: a phase modulator, a filter, a splitter, and logic gates.These devices are based on robust one-way modes but do not require an externalmagnetic field, which can allow for flexible assembly. In particular, weinvestigate a phase modulation range spanning from $-\pi$ to $\pi$, a perfectfilter that divides the input port's one-way region into two output one-wayregions with equal bandwidth, a multi-frequency splitter with an equalsplitting ratio (e.g., 50/50), and self-consistent logic gates. We validatethese theoretical findings through comprehensive full-wave numericalsimulations. Our findings may find applications in minimal optical calculationsand integrated optical circuits.

Realization of the all-optical phase modulator, filter, splitter, and  self-consistent logic gates based on assembled magneto-optical  heterostructures