We design an ultracompact optical isolator with normal incident geometry that operates with a bandwidth that is substantial for a device of this size. For operation in a telecommunication wavelength of 1:55 μm, the thickness of the device is less than 1μm and the device supports an operating bandwidth of 400GHz over which the minimum contrast ratio exceeds 25 dB. Our design utilizes guided resonance in a photonic crystal slab to enhance magneto-optical effects, and exploits interference effects among multiple resonances to create desired transmission spectral line shapes.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics