Kinoform design with an optimal-rotation-angle method

Bengtsson, Jörgen

doi:10.1364/ao.33.006879

Cited by 110 publications

(36 citation statements)

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“…However, considering long processing times of conventional 2PP systems, we believe that our multi-focus approach using LCOS-SLM is acceptable when the smoothness and fineness of the structures are not necessarily required. Introducing additional algorithms such as corrections to the optimal-rotationangle method would improve the uniformity of the spots 14,15 , and the spatial configuration of the focus spots could also be optimized (e.g., by using the method reported by Bengtsson et al 16 ). The poor quality of the structures might also be due to the high repetition rate of the femtosecond laser, i.e., the high energy of single pulses, which possibly causes boiling or destroying of the resin.…”

Section: Resultsmentioning

confidence: 99%

Functionalized 2PP structures for the BioPhotonics Workstation

et al. 2011

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In its standard version, our BioPhotonics Workstation (BWS) can generate multiple controllable counter-propagating beams to create real-time user-programmable optical traps for stable three-dimensional control and manipulation of a plurality of particles. The combination of the platform with microstructures fabricated by two-photon polymerization (2PP) can lead to completely new methods to communicate with micro-and nano-sized objects in 3D and potentially open enormous possibilities in nano-biophotonics applications. In this work, we demonstrate that the structures can be used as microsensors on the BWS platform by functionalizing them with silica-based sol-gel materials inside which dyes can be entrapped.

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Section: Resultsmentioning

confidence: 99%

Functionalized 2PP structures for the BioPhotonics Workstation

et al. 2011

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“…The maximum frequency of the CGH is ν max = N/(2W ). The CGH is designed with the optimum rotation angle (ORA) method [45], with compensation for the spatial frequency response of the LCSLM [20,37]. The CGH is imaged at the OL's pupil plane with magnification M = F 2 /F 1 , as shown in Fig.…”

Section: Mathematical Description Of the Optical Systemmentioning

confidence: 99%

“…The CGH was optimized by the ORA method [45]. The CGH was a Fourier hologram, and thus, the reconstruction calculation was performed with the fast Fourier transformation (FFT).…”

Section: Appendixmentioning

confidence: 99%

Experimental investigation of the closest parallel pulses in holographic femtosecond laser processing

et al. 2012

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In holographic femtosecond laser processing, diffractive parallel pulses are distorted by phase discontinuities and mutual interference between the neighborhoods in the reconstructed image of a Fourier computer-generated hologram when the interval is smaller than the beam diameter. We investigated holographic fabrication on a glass surface using parallel pulses with different intervals. We found the closest parallel pulses with sufficient separation to avoid mutual interference in holographic femtosecond laser processing. The minimum interval was 2.8 times larger than the diffracted beam diameter. The experimental results were also supported by a computer simulation. Our findings will be very useful in the design of holographic laser processing systems.

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“…One such algorithm is the so called over-compensation technique [2,3]. This technique first employs the traditional IFTA to provide a stable solution (a sufficient number of iterations are performed such that the solution converges).…”

Section: Ifta With Over-compensationmentioning

confidence: 99%

Diffractive Optics in the Infrared (DiOptIR) LDRD 67109 final report.

Alford¹,

Vawter²,

Wendt³

et al. 2005

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This diffractive optical element (DOE) LDRD is divided into two tasks. In Task 1, we develop two new DOE technologies: 1) a broad wavelength band effective anti-reflection (AR) structure and 2) a design tool to encode dispersion and polarization information into a unique diffraction pattern. In Task 2, we model, design, and fabricate a subwavelength polarization splitter.The first technology is an anti-reflective (AR) layer that may be etched into the DOE surface. For many wavelengths of interest, transmissive silicon DOEs are ideal. However, a significant portion of light (30% from each surface) is lost due to Fresnel reflection. To address this issue, we investigate a subwavelength, surface relief structure that acts as an effective AR coating.The second DOE component technology in Task 1 is a design tool to determine the optimal DOE surface relief structure that can encode the light's degree of dispersion and polarization into a unique spatial pattern. Many signals of interest have unique spatial, temporal, spectral, and polarization signatures. The ability to disperse the signal into a unique diffraction pattern would result in improved signal detection sensitivity with a simultaneous reduction in false alarm.Task 2 of this LDRD project is to investigate the modeling, design, and fabrication of subwavelength birefringent devices for polarimetric spectral sensing and imaging applications. Polarimetric spectral sensing measures the spectrum of the light and polarization state of light at each wavelength simultaneously. The capability to obtain both polarization and spectral information can help develop target/object signature and identify the target/object for several applications in NP&MC and national security.

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Kinoform design with an optimal-rotation-angle method

Cited by 110 publications

References 1 publication

Functionalized 2PP structures for the BioPhotonics Workstation

Functionalized 2PP structures for the BioPhotonics Workstation

Experimental investigation of the closest parallel pulses in holographic femtosecond laser processing

Diffractive Optics in the Infrared (DiOptIR) LDRD 67109 final report.

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