Monitoring of overmodulation effect in high efficient transmission gratings produced in photopolymers

Vojtíšek, Petr; Květoň, Milan

doi:10.1117/12.2070330

Cited by 1 publication

(3 citation statements)

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“…Nevertheless, if the grating is recorded, it is possible to check whether the grating is overmodulated or not for the desired reconstruction parameters. This overmodulation is indicated by an increase of the transmittance in the main peak under the Bragg condition and by the decrease of the transmittance of the side lobes [17,27]. For the grating presented in Figure 5, the region of the overmodulation is for wavelengths shorter than 814 nm and corresponding angles.…”

Section: Results Of Simulationsmentioning

confidence: 92%

“…It is possible to find a zero transmittance in the AS map along the Bragg condition (optimal reconstruction) and the transmittance for a different Bragg condition than this optimal reconstruction is increasing on both sides from this optimal reconstruction. More precisely, as the wavelength gets shorter the transmittance gains a value of one and then drops to values near zero again (effect of overmodulation [17,27]). …”

Section: Results Of Simulationsmentioning

confidence: 99%

“…Moreover, the AS maps indicate even overmodulation [27] of the gratings, or more precisely, the reconstruction parameters for which the grating will behave as overmodulated. This property is connected not only to the reconstruction parameters, but to the material and the recording parameters as well.…”

Section: Results Of Simulationsmentioning

confidence: 99%

See 2 more Smart Citations

Complex method for angular-spectral analysis of volume phase diffraction gratings recorded in photopolymers

Vojtíšek

Květoň

Richter

2016

J. Eur. Opt. Soc.-Rapid Publ.

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Photopolymer recording materials are nowadays widely used for recording of diffraction gratings and other diffraction elements. For obtaining the best performance of these diffraction gratings for desired applications, it is important to assess these gratings from many different perspectives. In this contribution, we present an experimental and characterization approach to an analysis of diffraction gratings recorded into photopolymer materials. This approach is able to provide a complex and very illustrative description of these gratings response and, with accordance to the theory, information about some important grating parameters, such as a spatial period, slant angle, etc., as well. This approach is based on the measurement of a grating response for a wide range of angles and wavelengths and then on the construction and subsequent analysis of maps in the angular-spectral plane. It is shown that the measurements are in a good agreement with the theoretical predictions based on either approximate (Kogelnik's coupled wave theory) or rigorous (RCWA) techniques and that this approach provides complex and detailed characterization of the grating response which can be used for additional optimization or decision of applicability of measured sample gratings.

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Section: Results Of Simulationsmentioning

confidence: 92%

Section: Results Of Simulationsmentioning

confidence: 99%