Polarization independent grating

Details Polarization independent grating Polarization independent grating

2006-08-14

2009-06-30

Chang, Audrey Y (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S569000

Reexamination Certificate

active

07554734

ABSTRACT:
A grating has a high diffraction efficiency into the minus first diffracted order in transmission, for both TE and TM polarizations. The incident angle may optionally be chosen so that the minus first diffracted order in reflection would be retroreflected back to the incident beam. The grating may be formed from various materials and/or layers, where the thicknesses of the individual layers may be determined by an optimization or simulation process. In one aspect, the grating may have four or more layers, formed with three or more materials. In another aspect, the grating may have a longitudinal refractive index profile that contains at least two local extrema, such as a maximum and/or minimum. Such a grating may be formed from three or more materials, two materials, or a single material that has a continuously varying refractive index. Any or all of the materials may have a continuously varying refractive index profile, as well. In another aspect, the grating may include a material that has a continuously varying refractive index profile.

REFERENCES:
patent: 4313648 (1982-02-01), Yano et al.
patent: 5982545 (1999-11-01), Su
patent: 6747799 (2004-06-01), Fabiny et al.
patent: 6754006 (2004-06-01), Barton et al.
patent: 6762880 (2004-07-01), Holm et al.
patent: 6900939 (2005-05-01), Hoshi et al.
patent: 6978062 (2005-12-01), Rose et al.
patent: 7142363 (2006-11-01), Sato et al.
patent: 7184214 (2007-02-01), Shiozaki et al.
patent: 2004/0201892 (2004-10-01), Shiozaki et al.
patent: 2005/0152037 (2005-07-01), Shiozaki et al.
patent: 2005/0200957 (2005-09-01), Hikichi et al.
patent: 2006/0018020 (2006-01-01), Hikichi et al.
patent: 2007101926 (2007-04-01), None
Shiozaki, Manabu, et al., “Novel Design of Polarization Independent Multi-layer Diffraction Grating with High Angular Dispersion”,SEI Technical Review, No. 59, Jan. 2005, pp. 27-31.
Tyan, Rong-Chung, et al., “Polarizing beam splitters constructed of form-birefringent multilayer gratings”, Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla, CA, Undated, 10 pages.
U.S. Appl. No. 11/414,783 for Johan Christer Holm, et al. entitled “Polarization Independent Grating,” filed Apr. 28, 2006.

Affiliated with

Also associated with

Rating

Polarization independent grating does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polarization independent grating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarization independent grating will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4145027