Defocusing 4 Detection scheme 4 Surface curvatures 4 Thermal expansion 4 Axial resolutions 2 Curve fitting 2 Cutoff frequency 2 Detection device 2 Detection methods 2 Experimental investigations 2 Four-quadrant 2 Fundamental physics 2 Lateral resolution 2 Light 2 Localized surface plasmon resonance 2 Metal Nanoparticles 2 Metallic nanoparticles 2 Micro-structural characterization 2 Microscopic levels 2 Nano scale 2 Nanoparticles 2 Nanostructured materials 2 Nanotechnology 2 Nonlinear curve fitting 2 Numerical methods 2 Optical Devices 2 Optical detection schemes 2 Optical properties 2 Plasmons 2 Probe laser 2