Despite their promising applications, several challenges hinder the widespread use of NLO effects in nanotechnology: - Material Stability: Many NLO materials degrade under high light intensities, limiting their practical use. - Fabrication Complexity: Advanced fabrication techniques are required to create nanostructures with desired nonlinear properties, which can be costly and time-consuming. - Integration: Integrating NLO materials with existing semiconductor technologies remains a significant challenge.