Development of deformation-tunable quadrupolar microcavity
  We have developed a technique for realizing a two-dimensional quadrupolar microcavity with its deformation variable from 0% to 20% continuously. We employed a microjet ejected from a noncircular orifice in order to generate a stationary column with modulated quadrupolar deformation in its cross section. Wavelength red shifts of low-order cavity modes due to shape deformation were measured and were found to be in good agreement with the wave calculation for the same deformation, indicating the observed deformation is quadrupolar in nature. 
Juhee Yang, Songky Moon, Sang-Bum Lee, Sang-Wook Kim, Jeong-Bo Shim,   Hai-Woong Lee, Jai-Hyung Lee, and Kyungwon An