We propose coupled cavities to realize a strong enhancement of the Raman scattering. Five sub cavities are embedded in the photonic crystals. Simulations through finite-difference time-domain (FDTD) method demonstrate that one cavity, which is used to propagate the pump beam at the optical-communication wavelength, has a Q factor as high as 1.254 × 108 and modal volume as small as 0.03μm3 (0.3192(λ/n)3). These parameters result in ultra-small threshold lasing power ~17.7nW and 2.58nW for Stokes and anti-Stokes respectively. The cavities are designed to support the required Stokes and anti-Stokes modal spacing in silicon. The proposed structure has the potential for sensor devices, especially for biological and medical diagnoses.
Original Publication Citation
Liu, Q., Ouyang, Z., & Albin, S. (2011). Coupled photonic crystal micro-cavities with ultra-low threshold power for stimulated raman scattering. Optics Express, 19(5), 4795-4804. doi:10.1364/OE.19.004795
Liu, Qiang; Ouyang, Zhengbiao; and Albin, Sacharia, "Coupled Photonic Crystal Micro-Cavities With Ultra-Low Threshold Power For Stiumulated Raman Scattering" (2011). Electrical & Computer Engineering Faculty Publications. 173.