Holographic fabrication of graded photonic super-crystals using an integrated spatial light modulator and reflective optical element laser projection system

Lowell, David; Hassan, Safaa; Adewole, Murthada; Philipose, Usha; Chen, Banglin; Lin, Yuankun

doi:10.1364/ao.56.009888

Cited by 26 publications

(28 citation statements)

References 17 publications

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“…A gold film was then deposited, and the positive resist was lifted off. The gold film initiated silicon growth for 200 nm (filling the groove of the pattern) [27]. Gold was again deposited over the entire flat surface to initiate the silicon film growth to a thickness of 300 nm.…”

Section: Description Of Graded Photonic Super-crystals and Simulationmentioning

confidence: 99%

“…When the lattice constant is above 500 nm, eight-beam interference lithography (four inner beams with an interference angle of α and four outer beams with an interference angle of β) can be used to fabricate the pattern [26,27]. A GPSC with a unit super-cell size of 26a × 26a (with a = 1100 nm) has been fabricated using eight-beam interference [27]. The unit super-cell size can be controlled by the selection of angles α and β [27].…”

Section: Description Of Graded Photonic Super-crystals and Simulationmentioning

confidence: 99%

“…A GPSC with a unit super-cell size of 26a × 26a (with a = 1100 nm) has been fabricated using eight-beam interference [27]. The unit super-cell size can be controlled by the selection of angles α and β [27]. It is easier to fabricate a GPSC with a large unit super-cell than one with a small unit super-cell.…”

Section: Description Of Graded Photonic Super-crystals and Simulationmentioning

confidence: 99%

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Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals

et al. 2017

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Light-trapping enhancement in newly discovered graded photonic super-crystals (GPSCs) with dual periodicity and dual basis is herein explored for the first time. Broadband, wide-incident-angle, and polarization-independent light-trapping enhancement was achieved in silicon solar cells patterned with these GPSCs. These super-crystals were designed by multi-beam interference, rendering them flexible and efficient. The optical response of the patterned silicon solar cell retained Bloch-mode resonance; however, light absorption was greatly enhanced in broadband wavelengths due to the graded, complex unit super-cell nanostructures, leading to the overlap of Bloch-mode resonances. The broadband, wide-angle light coupling and trapping enhancement mechanism are understood to be due to the spatial variance of the index of refraction, and this spatial variance is due to the varying filling fraction, the dual basis, and the varying lattice constants in different directions.

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Section: Description Of Graded Photonic Super-crystals and Simulationmentioning

confidence: 99%

Section: Description Of Graded Photonic Super-crystals and Simulationmentioning

confidence: 99%

Section: Description Of Graded Photonic Super-crystals and Simulationmentioning

confidence: 99%

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Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals

et al. 2017

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“…Very recently, graded photonic super-crystals (GPSCs) have been fabricated through the interference lithography by two sets of multiple beams arranged in a cone geometry [12][13][14]. The GPSC has two sets of lattices: the rod size (or hole size) increases gradually along one direction in one set of lattices while the other set decreases their sizes gradually.…”

Section: Introductionmentioning

confidence: 99%

“…The GPSC has two sets of lattices: the rod size (or hole size) increases gradually along one direction in one set of lattices while the other set decreases their sizes gradually. GPSC has dual period and even dual symmetry: The square lattices in GPSC have a small period while graded regions have their own symmetry and period [12][13][14]. GPSCs can be used to enhance the broadband light trapping in an Si solar cell, broadband light extraction from organic light emitting diode, and to form a resonance cavity at the boundary of graded and less-graded regions [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Generation of over 1000 Diffraction Spots from 2D Graded Photonic Super-Crystals

et al. 2020

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For the first time, we are able to generate over 1000 diffraction spots from a graded photonic super-crystal with a unit super-cell size of 12a × 12a where a is the lattice constant and hole radii are gradually changed in dual directions. The diffraction pattern from the graded photonic super-crystal reveals unique diffraction properties. The first order diffractions of (±1,0) or (0,±1) disappear. Fractional diffraction orders are observed in the diffraction pattern inside a square with vertices of (1,1), (1,−1), (−1,−1) and (−1,−1). The fractional diffraction can be understood from lattices with a period of a. However, a dual-lattice model is considered in order to explain higher-order diffractions. E-field intensity simulations show a coupling and re-distribution among fractional orders of Bloch waves. There are a total of 12 × 12 spots in E-field intensity in the unit supercell corresponding to 12 × 12 fractional diffraction orders in the diffraction pattern and 12 × 12 fractional orders of momentum in the first Brillouin zone in k-space.

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Design and simulation of a compact all-optical 2-to-1 digital multiplexer based on photonic crystal resonant cavity

Maleki

Soroosh

2022

Opt Quant Electron

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Holographic fabrication of graded photonic super-crystals using an integrated spatial light modulator and reflective optical element laser projection system

Cited by 26 publications

References 17 publications

Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals

Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals

Generation of over 1000 Diffraction Spots from 2D Graded Photonic Super-Crystals

Design and simulation of a compact all-optical 2-to-1 digital multiplexer based on photonic crystal resonant cavity

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