| Title: | Optimization of sawtooth surface-relief gratings: effects of substrate refractive index and polarization |
| Author: | Wu, Shun-Der ; Gaylord, Thomas K. ; Glytsis, Elias N. |
| Abstract: | The effect of the refractive index of the substrate together with the incident polarization on the optimization of sawtooth surface-relief gratings (SRGs) is investigated. The global optimum diffraction efficiencies of the −1st forward-diffracted order of sawtooth SRGs are 63 .3% occurring at n ₂ =1.47 for TE polarization and 73.8% occurring at n ₂ =2.88 for TM polarization. Incident TE polarization has higher optimum diffraction efficiency than TM polarization for all n ₂ <1.85 . In contrast, TM polarization has higher optimum diffraction efficiency than TE polarization for all n ₂ >1.85 . A polymer (n ₂ =1.5) optimum sawtooth SRG exhibits 62.6% efficiency for TE polarization. A silicon (n ₂ =3.475) optimum sawtooth SRG exhibits 68.6% efficiency for TM polarization. These sawtooth SRGs are compared to right-angle-face trapezoidal SRGs. It is found that the optimum profiles of right-angle-face trapezoidal SRGs have only very slightly increased efficiencies over sawtooth SRGs (0.04% for TE and 0.55% for TM). |
| Description: |
© 2006 Optical Society of America. The definitive version of this paper is available at: http://dx.doi.org/10.1364/AO.45.003420 DOI: 10.1364/AO.45.003420 |
| Type: | Article |
| URI: | http://hdl.handle.net/1853/45418 |
| ISSN: | 0003-6935 |
| Citation: | Wu, SD and Gaylord, Thomas K. and Glytsis, EN, "Optimization of sawtooth surface-relief gratings: effects of substrate refractive index and polarization," Applied Optics, 45, 15, 3420-3424 (May 20 2006) |
| Date: | 2006-05 |
| Contributor: |
Georgia Institute of Technology. Center for Organic Photonics and Electronics
Georgia Institute of Technology. School of Electrical and Computer Engineering Georgia Institute of Technology. Microelectronics Research Center |
| Publisher: |
Georgia Institute of Technology
Optical Society of America |
| Subject: |
Diffraction gratings
Optical devices Physical optics Polarization |
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