Related Experiment Video
Updated: Jun 4, 2026
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
Coupled photonic crystal micro-cavities with ultra-low threshold power for stimulated Raman scattering
Qiang Liu1, Zhengbiao Ouyang, Sacharia Albin
1Photonics Laboratory, Department of Electrical & Computer Engineering, Old Dominion University, Norfolk, VA 23529, USA.
Abstract:
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 0.03 μm3 (0.3192(λ/n)3). These parameters result in ultra-small threshold lasing power~17.7 nW and 2.58 nW 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.
