Hong, R.-C.R.-C.HongLin, C.-Y.C.-Y.LinChuang, Y.-L.Y.-L.ChuangWu, C.-M.C.-M.WuSu, Y.Y.SuLee, J.Y.I.J.Y.I.LeeJeng, C.-C.C.-C.JengMING-FENG SHIHLee, R.-K.R.-K.Lee2019-12-272019-12-27201801469592https://scholars.lib.ntu.edu.tw/handle/123456789/443276https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049856280&doi=10.1364%2fOL.43.003329&partnerID=40&md5=f540f50fe7bfcbe826d5d2b6413a4e19To explore resonance phenomena in the nonlinear region, we show by experimental measurements and theoretical analyses that resonance happens in modulation instability from non-instantaneous nonlinearities in photorefractive crystals. With a temporally periodic modulation in the external bias voltage, corresponding to a modulation in the nonlinear strength, an enhancement in the visibility of MI at resonant frequency is reported through spontaneous optical pattern formations. Theoretical curves obtained from a nonlinear non-instantaneous Schrödinger equation give good agreement to experimental data. © 2018 Optical Society of America.Modulation; Natural frequencies; Nonlinear equations; Photorefractive crystals; Dinger equation; Modulation instabilities; Non-linear strength; Nonlinear regions; Optical pattern formation; Periodic modulation; Resonance phenomena; Nonlinear optics; article; body patterning; external bias; nonlinear system; theoretical study; visibilityjournal article10.1364/OL.43.003329300044982-s2.0-85049856280WOS:000438867400034https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049856280&doi=10.1364%2fOL.43.003329&partnerID=40&md5=f540f50fe7bfcbe826d5d2b6413a4e19