3 Characterization Methods for Nonlinear Absorption and Refraction Coefficients 3.1 Introduction 3.2 Theory and Setup ofBasic Z-scan Method 3.2.1 Description ofBasic Principle 3.2.2 DataAnalysis for Z-scan Curves 3.3 Generation and Elimination of Pseudo-nonlinearity in z-scan Measurement 3.3.1 IncidentAngle as a Function ofZ-scan Position 3.3.2 Dependence of Transmittance on Incident and Polarization Azimuth Angles 3.3.3 Incident Angle Change-Induced Pseudo-nonlinear Absorption 3.3.4 Calculated Pseudo-nonlinear Absorption Curves 3.3.5 Reduction or Elimination of Pseudo-nonlinear Absorption 3.4 Eliminating the Influence from Reflection Loss on z-scan Measurement 3.4.1 Fresnel Reflection Loss in the z-scan Measurement 3.4.2 The Case of Thin Samples 3.4.3 The Case of Nanofilm Samples 3.5 Influence of Feedback Light on z-scan Measurement 3.5.1 Influence of Feedback Light on Semiconductor Laser Devices 3.5.2 Elimination of Feedback Light Influence on z-scan Measurement References
4 Optical Nonlinear Absorption and Refraction of Semiconductor Thin Films 4.1 Introduction 4.2 Theoretical Basis 4.2.1 Two-Band Model for Free-Carriers-Induced Nonlinear Effects 4.2.2 Three-Band Model for Nonlinear Absorption and Refraction 4.2.3 Thermally Induced Nonlinear Absorption and Refraction 4.3 Nonlinear Absorption and Refraction of Semiconductor Thin Films. 4.3.1 Nonlinear Saturation Absorption of c-Sb-Based Phase-Change Thin Films 4.3.2 Nonlinear Reverse Saturation Absorption and Refraction ofc-InSb Thin Films 4.3.3 Nonlinear Reverse Saturation Absorption of AglnSbTe Thin Films 4.3.4 Nonlinear Absorption Reversal of c-Ge2Sb2Te5 Thin Films 4.3.5 Nonlinear Saturation Absorption and Refraction of Ag-doped Si Thin Films. 4.4 Summary References
5 Nanoscale Spot Formation Through Nonlinear Refraction Effect 5.1 Introduction 5.2 Interference Manipulation-Induced Nanoscale Spot 5.2.1 Nonlinear Fabry-Perot Cavity Structure Model 5.3 Self-focusing Effect-Induced Nanoscale Spot Through “Thick”Samples 5.3.1 MultilayerThin Lens Self-focusing Model 5.3.2 Light Traveling Inside Positive Nonlinear Refraction Samples 5.3.3 Comparison with Equivalent Converging Lens Model 5.3.4 Application Schematic Design 5.4 Summary References
6 Optical Super-Resolution Effect Through Nonlinear Saturation Absorption 6.1 Basic Description of Nonlinear Saturation Absorption-Induced Super-Resolution Effect 6.2 Becr-Lambert Model for Thin（or Weak）Nonlinear Saturation Absorption Sample 6.2.1 Beer-Lambert Analytical Model 6.2.2 Experimental Observation of Super-Resolution Spot 6.3 Multi-layer Model for Thick（or Strong）Nonlinear Saturation Absorption Samples 6.3.1 Multi-layer Analytical Model for Formation of Pinhole Channel 6.3.2 Super-Resolution Effect Analysis Using Multi-layer Model 6.4 Summary References
7 Resolving Improvement by Combination of Pupil Filters and Nonlinear Thin Films 7.1 Introduction 7.2 Super-Resolution with Pupil Filters 7.2.1 Binary Optical Elements as Pupil Filters：Linearly Polarized Light Illumination 7.2.2 Temary optical Elements as Pupil Filters：Radially or CircularlyPolarizedLight Illumination 7.3 Combination of Pupil Filters with Nonlinear Absorption Thin Films 7.3.1 Combination of Nonlinear Saturation Absorption Thin Films with Three-Zone Annular Binary Phase Filters：Linearly Polarized Light Illumination 7.3.2 Combination of Nonlinear Reverse Saturation Absorption Thin Films with Five-Zone Binary Pupil Filter： Circularly Polarized Light Illumination 7.4 Nonlinear Thin Films as Pupil Filters 7.4.1 ScalarTheoretical Basis 7.4.2 Super-Resolution Spot Analysis References
8 Applications of Nonlinear Super.Resolution Thin Films in Nano.optical Data Storage 8.1 Development Trend for Optical Information Storage 8.2 Saturation Absorption-Induced High-Density Optical Data Storage 8.2.1 Read-Only Super-Resolution Optical Disk Storage 8.2.2 Recordable Super-Resolution Nano-optical Storage 8.3 Reverse-Saturation Absorption-Induced Super-Resolution Optical Storage 8.3.1 Recordable Super-Resolution Optical Disks with Nonlinear Reverse-Saturation Absorption 8.3.2 Read-Only Optical Disk with Reverse-Saturation Absorption Effect 8.4 Read-Only Super-Resolution Optical Disks with Thermally Induced Reflectance Change Effect References
9 Applications of Nonlinear Super.Resolution Effects in Nanolithography and High.Resolution Light Imaging 9.1 Introduction 9.2 Thermal Threshold Lithography 9.2.1 CryStallization Threshold Lithography 9.2.2 Thermal Decomposition Threshold Lithography 9.2.3 MoltenAblationThresholdLithography 9.2.4 Pattern Application：Grayscale Lithography 9.3 Nanolithography by Combination of Saturation Absorption and Thermal Threshold Efiects 9.3.1 Basic Principle 9.3.2 Nanoscale Lithography Induced by Si Thin Film with 405-nm Laser wavelength 9.4 Nanolithography by Combination of Reverse Saturation Absorptionand Thermal Diffusion Manipulation 9.4.1 Formation of Below-Diffraction-Limited Energy Absorption Spot 9.4.2 Thermal Diffusion Manipulation by Thermal Conductive Layer 9.4.3 Experimental Nanolithography Marks 9.5 Nonlinearity-Induced Super-Resolution Optical Imaging 9.5.1 Basic Principle Schematics 9.5.2 Theoretical Description 9.5.3 Experimental Testing 9.6 Summary References Remarkings
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