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Rectangular Luneburg-type lenses for integrated optics.

V E Wood, J R Busch, D T Moore

|August 29, 2009

Summary

This summary is machine-generated.

Researchers created compact Luneburg lenses on lithium niobate waveguides using As2S3 glass. These lenses achieve f/5.5 speeds and maintain a wide 25-degree field of view, advancing integrated optics.

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Area of Science:

Integrated Optics
Materials Science
Waveguide Optics

Background:

Lithium niobate (LiNbO3) on insulator (LNOI) platforms are crucial for integrated photonics.
Efficient on-chip optical components are needed to manipulate light within waveguides.

Purpose of the Study:

To fabricate compact Luneburg-type lenses with rectangular outlines on single-mode waveguides.
To evaluate the optical performance, including speed and focal spot size, of these fabricated lenses.

Main Methods:

Thermal evaporation of arsenic sulfide (As2S3) glass onto single-mode LiNbO3:Ti waveguides.
Utilized shaped masks during evaporation for precise lens geometry.
Patterned the deposited glass using ultraviolet (UV) light exposure.

Main Results:

Successfully fabricated compact Luneburg lenses with rectangular profiles.
Achieved lens speeds of f/5.5 at a 10 mm aperture.
Observed focal spots approximately 1.2 times the diffraction-limited size at reduced apertures.
Demonstrated a field of view of at least 25 degrees within the waveguide.

Conclusions:

Compact Luneburg lenses can be effectively fabricated on LiNbO3:Ti waveguides using As2S3 glass.
The fabricated lenses exhibit promising optical performance suitable for integrated photonic applications.
These lenses offer a wide field of view, enhancing their utility in on-chip optical systems.