The efficiency of relief-phase diffractive elements at a small number of Fresnel zones

Greĭsukh, G. I.; Ezhov, E. G.; Kalashnikov, A. V.; Levin, I. A.; Степанов, С. А.

doi:10.1134/s0030400x12100037

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…The typical MLDOE is a double-layer DOE which consists of two harmonic diffractive elements (HDEs) [9] with different 2040-8978/14/035707+07$33.00 dispersive materials. The two HDEs are aligned together with the same pitch periods and different correlated relief heights [10]. As the ambient temperature changes, the correlated relief heights of the two HDEs expand or contract, and the refractive indices also change.…”

Section: Relationship Between the Diffraction Efficiency For Mldoes A...mentioning

confidence: 99%

“…When the environmental temperature deviates from the design temperature, T 0 = 20 • C, the relationship among diffraction efficiency, wavelength and temperature is shown in figure 2. The minimum diffraction efficiency and PIDE calculated by (10) and (11) are listed in table 2. If the environmental temperature decreases from 20 to −62 • C, the minimum diffraction efficiency increases from 94.8750% to 95.5079% (an increase of 0.6329%), however the PIDE reduces from 99.2523% to 98.1477% (a reduction of 1.1046%).…”

Section: Visible Applicationmentioning

confidence: 99%

“…When the above MLDOE is applied in the LWIR 8-12 µm, the relation among the diffraction efficiency, wavelength and temperature is shown in figure 4. The diffraction efficiency and PIDE calculated by (10) and (11) are listed in table 4.…”

Section: Infrared Applicationmentioning

confidence: 99%

See 2 more Smart Citations

Diffraction efficiency change of multilayer diffractive optics with environmental temperature

Piao¹,

Cui²,

Zhu³

et al. 2014

J. Opt.

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In this paper, the effect of an environmental temperature change on multilayer diffractive optical elements (MLDOEs) is studied in terms of the diffraction efficiency and the polychromatic integral diffraction efficiency (PIDE). The relation between the diffraction efficiency of MLDOEs and environmental temperature is analyzed theoretically, and examples of different MLDOEs are discussed in the visible and infrared wavebands. The result shows that the diffraction efficiency reduction is no more than 5% and the PIDE reduction is less than 1.5% for optical plastic MLDOEs in the visible waveband when the environmental temperature ranges from −62 to 71 • C, and that the decrease of both the diffraction efficiency and PIDE for MLDOEs is more significant in the mid-wave infrared than in the long-wave infrared. The analysis result can be considered during optical engineering design with MLDOEs.

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Section: Relationship Between the Diffraction Efficiency For Mldoes A...mentioning

confidence: 99%

Section: Visible Applicationmentioning

confidence: 99%

See 1 more Smart Citation

Diffraction efficiency change of multilayer diffractive optics with environmental temperature

Piao¹,

Cui²,

Zhu³

et al. 2014

J. Opt.

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show abstract

“…A Fresnel antenna incorporates a set of concentric annular zones called Fresnel zones [1][2][3]. Depending on the geometry and the fabrication material of Fresnel Zones, the Fresnel antenna can be classified as the Fresnel lens or Fresnel Zone Plates (FZPs).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, FZPs have been taking place of the Fresnel lenses in recent years [4][5][6][7][8]. The applications of FZPs in millimeter/centimeter wave regions were uncommon in the past, because of their relatively low gain, controlling by shaping side/back lobes, in comparison with that of parabolic reflector antennas [2]. With advances in active devices, it is no longer a problem to increase the transmitted power and engineers have Sakarya University Journal of Science 24 (5), [819][820][821][822][823][824][825][826][827][828][829][830][831]2020 been implementing different types of FZPs to deal with it.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Beam Width Shaping of a Ku-band Horn Antenna using a Diffractive Optic Element and an Electromagnetic Wave Absorber

Teber

2020

Sakarya University Journal of Science

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The feasibility of beam-shaping of a Ku-Band horn as a transmitting (Tx) antenna by mounting two different versions of lenses which are kind of Fresnel Zone Plates (FZP) is studied. The designed and fabricated geometrical structures offer a simpler approach building Fresnel Zone Plates by using an electromagnetic wave absorber and diffractive optic material. The diffractive optic material, paraffin, forms a set of alternating open and opaque annular zones on a flat surface, based on the design principles of Fresnel Zone Plates. An electromagnetic wave absorber covers the top surface of the formed paraffin, but not including the grooves. Thereafter, the Fresnel Zone plates are suitably attached in front of the transmitter horn antenna, located in the far-field region of a receiving antenna. The half-power beam-widths for the horn antenna (unloaded) and with two types of lenses are investigated. The results indicate that Fresnel zone plate structures can play a role suppressing side lobes in H-plane so that the effective radiation is to be significantly concentrated.

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Diffractive Elements in the Optical System: Successes, Challenges, and Solutions

Greĭsukh

Ezhov

Levin

et al. 2015

Radiophys Quantum El

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The efficiency of relief-phase diffractive elements at a small number of Fresnel zones

Cited by 15 publications

References 5 publications

Diffraction efficiency change of multilayer diffractive optics with environmental temperature

Diffraction efficiency change of multilayer diffractive optics with environmental temperature

Investigation of Beam Width Shaping of a Ku-band Horn Antenna using a Diffractive Optic Element and an Electromagnetic Wave Absorber

Diffractive Elements in the Optical System: Successes, Challenges, and Solutions

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