title: Broadband Gerchberg-Saxton algorithm for freeform diffractive spectral filter design.
abstract: A multi-wavelength expansion of the Gerchberg-Saxton (GS) algorithm is developed to design and optimize a surface relief Diffractive Optical Element (DOE). The DOE simultaneously diffracts distinct wavelength bands into separate target regions. A description of the algorithm is provided, and parameters that affect filter performance are examined. Performance is based on the spectral power collected within specified regions on a receiver plane. The modified GS algorithm is used to design spectrum splitting optics for CdSe and Si photovoltaic (PV) cells. The DOE has average optical efficiency of 87.5% over the spectral bands of interest (400-710 nm and 710-1100 nm). Simulated PV conversion efficiency is 37.7%, which is 29.3% higher than the efficiency of the better performing PV cell without spectrum splitting optics.
authors.forename: Shelby
authors.initials: S
authors.lastname: Vorndran
authors.forename: Juan M
authors.initials: JM
authors.lastname: Russo
authors.forename: Yuechen
authors.initials: Y
authors.lastname: Wu
authors.forename: Silvana Ayala
authors.initials: SA
authors.lastname: Pelaez
authors.forename: Raymond K
authors.initials: RK
authors.lastname: Kostuk