Nonlinear refraction and absorption measurements of thin films by the dual-arm Z-scan method.

We extend the recently developed dual-arm Z-scan to increase the signal-to-noise ratio (SNR) for measuring the nonlinear refraction (NLR) of thin films on thick substrates. Similar to the case of solutes in solution, the phase shift due to NLR in a thin film can often be dominated by the phase shift due to NLR in the much thicker substrate. SNR enhancement is accomplished by simultaneously scanning a bare substrate and the film plus substrate in two separate but identical Z-scan arms. The subtraction of these signals taken simultaneously effectively cancels the nonlinear signal from the substrate, leaving only the signal from the film. More importantly, the SNR is increased since the correlated noise from effects such as beam-pointing instabilities cancels. To show the versatility of the dual-arm Z-scan method, we perform measurements on semiconductor and organic thin films, some less than 100 nm thick and with thicknesses up to 4 orders of magnitude less than the substrate.

[1]  E. W. Stryland,et al.  Temporal and Polarization Dependence of the Nonlinear Optical Response of Solvents , 2018 .

[2]  E. V. Van Stryland,et al.  Enhancement Mechanism of Nonlinear Optical Response of Transparent Conductive Oxides at Epsilon-Near-Zero , 2018, 2018 Conference on Lasers and Electro-Optics (CLEO).

[3]  A. Kildishev,et al.  Engineered nonlinear materials using gold nanoantenna array , 2018, Scientific Reports.

[4]  David J. Hagan,et al.  Cross-propagating beam-deflection measurements of third-order nonlinear optical susceptibility , 2017, LASE.

[5]  E. V. Van Stryland,et al.  Dispersion of nondegenerate nonlinear refraction in semiconductors. , 2016, Optics express.

[6]  David J. Hagan,et al.  Temporal, Spectral, and Polarization Dependence of the Nonlinear Optical Response of Carbon Disulfide , 2014 .

[7]  Matthew Reichert,et al.  Beam deflection measurement of time and polarization resolved ultrafast nonlinear refraction. , 2013, Optics letters.

[8]  Alfred R. Ernst,et al.  Nonlinear Refraction Measurements of Thin Films by the Dual-arm Z-scan Method , 2013 .

[9]  David J. Hagan,et al.  Dual-arm Z-scan technique to extract dilute solute nonlinearities from solution measurements , 2012 .

[10]  J. Perry,et al.  Materials for Loss-Based Switching in Silicon-Organic Hybrid Devices , 2012 .

[11]  J. Perry,et al.  Four Wave Mixing in Silicon-Organic Hybrid Waveguides , 2012 .

[12]  F. Wise,et al.  Ultrafast and octave-spanning optical nonlinearities from strongly phase-mismatched quadratic interactions. , 2011, Physical review letters.

[13]  Stephen Barlow,et al.  Design of Polymethine Dyes with Large Third-Order Optical Nonlinearities and Loss Figures of Merit , 2010, Science.

[14]  F. Charpentier,et al.  Photoinduced effects in thin films of Te20As30Se50 glass with nonlinear characterization , 2009 .

[15]  David R. Clarke,et al.  On the optical band gap of zinc oxide , 1998 .

[16]  D. Milam.  Review and assessment of measured values of the nonlinear refractive-index coefficient of fused silica. , 1998, Applied optics.

[17]  Mansoor Sheik-Bahae,et al.  Infrared to ultraviolet measurements of two-photon absorption and n/sub 2/ in wide bandgap solids , 1996 .

[18]  David J. Hagan,et al.  All‐optical modulation via nonlinear cascading in type II second‐harmonic generation , 1995 .

[19]  Stegeman,et al.  Observation of two-dimensional spatial solitary waves in a quadratic medium. , 1995, Physical review letters.

[20]  Mansoor Sheik-Bahae,et al.  Determination of bound-electronic and free-carrier nonlinearities in ZnSe, GaAs, CdTe, and ZnTe , 1992 .

[21]  A. Gomes,et al.  Measurements of nondegenerate optical nonlinearity using a two-color single beam method , 1991 .

[22]  Mansoor Sheik-Bahae,et al.  Dispersion of bound electron nonlinear refraction in solids , 1991 .

[23]  Hagan,et al.  Dispersion and band-gap scaling of the electronic Kerr effect in solids associated with two-photon absorption. , 1990, Physical review letters.

[24]  E. W. Stryland,et al.  Sensitive Measurement of Optical Nonlinearities Using a Single Beam Special 30th Anniversary Feature , 1990 .

[25]  G I Stegeman,et al.  Two-photon absorption as a limitation to all-optical switching. , 1989, Optics letters.

[26]  Nastaran Mansour,et al.  Laser-Induced Damage And The Role Of Self-Focusing , 1989 .

[27]  E. W. Stryland,et al.  High-sensitivity, single-beam n(2) measurements. , 1989, Optics letters.

[28]  George I. Stegeman,et al.  Waveguides and Fibers for Nonlinear Optics , 1989, Nonlinear Optical Properties of Materials.

[29]  M. J. Soileau,et al.  Verification of the scaling rule for two-photon absorption in semiconductors , 1986 .

[30]  E. W. Stryland,et al.  Energy band-gap dependence of two-photon absorption. , 1985, Optics letters.

[31]  S. Guha,et al.  Self-defocusing in CdSe induced by charge carriers created by two-photon absorption. , 1985, Optics letters.

[32]  E. Sharp,et al.  Studies of the Nonlinear Switching Properties of Liquid Crystals with Picosecond Pulses , 1985 .

[33]  Brian S. Wherrett,et al.  Scaling rules for multiphoton interband absorption in semiconductors , 1984 .

[34]  David J. Hagan,et al.  Cascaded second-order effects in N-(4-nitrophenyl)-L-prolinol, in a molecular single crystal , 1997 .

[35]  G. Stegeman,et al.  Self-focusing and self-defocusing by cascaded second-order effects in KTP. , 1992, Optics letters.

[36]  David J. Hagan,et al.  Direct measurements of nonlinear absorption and refraction in solutions of phthalocyanines , 1992 .

[37]  D. J. Hagan,et al.  Kramers-Krönig relations in nonlinear optics , 1992 .