Multifocal diffractive lens generating several fixed foci at different design wavelengths.

Area of Science:

• Optics
• Optical Engineering
• Materials Science

Background:

• Multifocal diffractive lenses are crucial for vision correction.
• Chromatic aberrations limit the performance of current multifocal lens designs.
• Precisely controlling focal points at multiple wavelengths remains a challenge.

Purpose of the Study:

• To propose and validate a novel method for designing multifocal diffractive lenses.
• To achieve fixed focal positions for multiple wavelengths simultaneously.
• To reduce chromatic effects in multifocal lens applications.

Main Methods:

• Minimizing the difference between complex amplitudes of generated beams and calculated multifocal lens transmissions.
• Utilizing a design approach based on complex amplitude matching at specific wavelengths.
• Fabricating and experimentally investigating a proof-of-concept zone plate lens.

Main Results:

• Successfully designed a zone plate lens generating three fixed foci at three distinct wavelengths.
• Experimental validation confirmed the formation of foci at the designed fixed positions for each wavelength.
• The method demonstrated the capability to control focal points across multiple wavelengths.

Conclusions:

• The proposed method offers a viable approach for designing multifocal diffractive lenses with fixed focal points.
• This technique has potential applications in developing next-generation multifocal contact lenses and intraocular lenses.
• The results pave the way for multifocal optics with significantly reduced chromatic aberration.