Optical Design and Engineering

Influence of grating thickness in low-contrast subwavelength grating concentrating lenses

[+] Author Affiliations
Mao Ye

University of Michigan, Integrated Nano Optoelectronics Laboratory, 4901 Evergreen Road, Dearborn, Michigan 48128, United States

Ya Sha Yi

University of Michigan, Integrated Nano Optoelectronics Laboratory, 4901 Evergreen Road, Dearborn, Michigan 48128, United States

University of Michigan, Energy Institute, 2301 Bonisteel Boulevard, Ann Arbor, Michigan 48109, United States

Opt. Eng. 55(7), 075102 (Jul 01, 2016). doi:10.1117/1.OE.55.7.075102
History: Received April 1, 2016; Accepted June 15, 2016
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Abstract.  Conventional subwavelength grating concentrating lenses are designed based on calculated phase overlap, wherein the phase change is fixed by the grating thickness, bar-width, and airgap, and therefore the focus. We found that certain concentration effects can still be maintained by changing the grating thickness with the same bar-widths and airgap dimensions. Following that, we discovered the existence of the grating thickness threshold; light concentration intensity spikes upon exceeding this limit. However, the light concentration property does not change continuously with respect to a steady increase in grating thickness. This observation indicates that there exists a concentration mode self-interference effect along the light propagation direction inside the gratings. Our results may provide guidance in designing and fabricating microlenses in a potentially more easy and controllable manner. Such approaches can be utilized in various integrated nanophotonics applications ranging from optical cavities and read/write heads to concentrating photovoltaics.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Topics

Lenses ; Simulations

Citation

Mao Ye and Ya Sha Yi
"Influence of grating thickness in low-contrast subwavelength grating concentrating lenses", Opt. Eng. 55(7), 075102 (Jul 01, 2016). ; http://dx.doi.org/10.1117/1.OE.55.7.075102


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