Lineshape study of optical force spectra on resonant structures

Area of Science:

• Optics
• Nanotechnology
• Theoretical Physics

Background:

• Controlling micro- and nano-scale objects with light requires understanding optical force spectra.
• Object spectral resonances significantly impact optical force behavior.

Purpose of the Study:

• To develop a theoretical framework for analyzing optical force spectra.
• To describe lineshape dependencies on resonant scatterers and incident wavefronts.
• To provide a design tool for optical manipulation applications.

Main Methods:

• Utilized temporal coupled-mode theory for analytical description.
• Derived closed-form formulae for force spectra lineshapes.
• Investigated conditions for symmetric (Lorentzian) and asymmetric (Fano) resonances.

Main Results:

• Developed a formalism to analytically describe optical force spectra lineshapes.
• Obtained formulae for predicting spectral dependencies on resonant scatterers.
• Demonstrated the formalism's utility in a conceptual particle size-sorting mechanism.

Conclusions:

• The developed theoretical formalism accurately describes optical force spectra.
• This work provides insights into controlling optical forces for micro- and nano-object manipulation.
• The formalism serves as a valuable tool for designing optical manipulation systems, including those for biomedical applications.