An integrable all-silicon slotted photonic crystal Raman laser

Abstract

The design of an integrable all-silicon Raman laser of a foot print of ∼7 μm is proposed based on a slotted photonic crystal nanocavity. The slot has been considered to be made of a silicon nanocrystal to encash its giant Raman gain coefficient, along with the tight spatial and temporal confinement of light in the slot, exhibiting a lasing efficiency of ∼17.8% at a wavelength of 1552 nm. Simulations depict that the device requires a very small optical threshold power of the order of 0.5 μW. Tolerances to the fabrication imperfections have also been evaluated, which explores that the device performance is tolerant up to a 6% random deviation in structural parameters like radius and in-plane positions of the holes. It has also been seen through simulations that the submicrowatt threshold is maintained even for a large deterioration of over 30% in the Q-factors and modal volumes, which reassures the realization feasibility of the device.

Thermally Tuned High-Performance III-V/Si3N4 External Cavity Laser

“…However, due to the indirect bandgap material property of silicon, efficient lasers cannot be made directly on silicon. Although some efforts have been made by resorting to nanostructures [8][9][10], erbium doping [11][12][13], and Raman effects [14,15], there is still a long way for real-world applications. A viable method for silicon light sources is the integration of external III-V materials with silicon photonics.…”

Integrated Raman Laser: A Review of the Last Two Decades

“…In reference [113], Pradhan et al reported the design of an integrable all-silicon Raman laser of a foot print of 7µm, based on a slotted photonic crystal nanocavity, which takes advantage the giant Raman gain coefficient of a silicon nanocrystal [56]. The device exhibits a lasing efficiency of 18% at a wavelength of 1552 nm, with an optical threshold power of the order of 0.5 µW.…”

All‐optical logic inverter for large‐scale integration in silicon photonic circuits

“…Nevertheless, these limitations can be removed by further intensifying the SRS interaction using the slow‐light phenomenon inside a silicon nanocrystal embedded slotted photonic crystal waveguide (SPCW), which has been demonstrated by the authors in [17, 18]. SPCWs are potential waveguide geometries which offer ultra‐high optical confinement [19] and, thereby, explore myriad of electro‐optical and all‐optical functionalities reported recently [20–24]. Silicon nanocrystal embedded in silica host (), on the other hand, is a promising material in the silicon photonics platform, which offers substantial enrichment of the optical non‐linearities, especially the SRS gain coefficient, which is enhanced by four orders of magnitude in the near‐ to mid‐infrared spectral region [25–29].…”