Large-area, high-numerical-aperture multi-level diffractive lens via inverse design

Meem, Monjurul; Banerji, Sourangsu; Pies, C.; Oberbiermann, Timo; Majumder, Apratim; Sensale‐Rodriguez, Berardi; Menon, Rajesh

doi:10.1364/optica.388697

Cited by 65 publications

(38 citation statements)

References 18 publications

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“…Various research groups have designed achromatic MDLs via careful parametric optimization of the lens surface topography in the visible 3,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] , NIR 26 , SWIR 27 , LWIR 28 , THz 29,30 and microwave 31 bands. In fact, we have recently shown the design of a single achromatic MDL with a focal length of 18 mm and aperture of ~ 1 mm, operating across a continuous spectrum of wavelengths from 450 nm to 15 μm 32,33 .…”

Section: Sourangsu Banerji Jacqueline Cooke and Berardi Sensale-rodrigmentioning

confidence: 99%

Impact of fabrication errors and refractive index on multilevel diffractive lens performance

Banerji

Cooke

Sensale‐Rodriguez

2020

Sci Rep

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Multilevel diffractive lenses (MDLs) have emerged as an alternative to both conventional diffractive optical elements (DOEs) and metalenses for applications ranging from imaging to holographic and immersive displays. Recent work has shown that by harnessing structural parametric optimization of DOEs, one can design MDLs to enable multiple functionalities like achromaticity, depth of focus, wide-angle imaging, etc. with great ease in fabrication. Therefore, it becomes critical to understand how fabrication errors still do affect the performance of MDLs and numerically evaluate the trade-off between efficiency and initial parameter selection, right at the onset of designing an MDL, i.e., even before putting it into fabrication. Here, we perform a statistical simulation-based study on MDLs (primarily operating in the THz regime) to analyse the impact of various fabrication imperfections (single and multiple) on the final structure as a function of the number of ring height levels. Furthermore, we also evaluate the performance of these same MDLs with the change in the refractive index of the constitutive material. We use focusing efficiency as the evaluation criterion in our numerical analysis; since it is the most fundamental property that can be used to compare and assess the performance of lenses (and MDLs) in general designed for any application with any specific functionality.

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Section: Sourangsu Banerji Jacqueline Cooke and Berardi Sensale-rodrigmentioning

confidence: 99%

Impact of fabrication errors and refractive index on multilevel diffractive lens performance

Banerji

Cooke

Sensale‐Rodriguez

2020

Sci Rep

Self Cite

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“…Moreover, the emerging flat optics including broadband diffractive lenses ( Meem et al., 2020 ), metalenses ( Chen et al., 2019 ), and LC Pancharatnam-Berry phase lenses ( Zhan et al., 2019a ) can also be applied in the VR lens system for aberration control and system miniaturization. By adding a thin-film flat polymer lens, it is possible to sharpen the imagery by more than three times ( Zhan et al, 2020b ).…”

Section: Vr: Viewing Opticsmentioning

confidence: 99%

Augmented Reality and Virtual Reality Displays: Perspectives and Challenges

et al. 2020

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Summary As one of the most promising candidates for next-generation mobile platform, augmented reality (AR) and virtual reality (VR) have potential to revolutionize the ways we perceive and interact with various digital information. In the meantime, recent advances in display and optical technologies, together with the rapidly developing digital processers, offer new development directions to advancing the near-eye display systems further. In this perspective paper, we start by analyzing the optical requirements in near-eye displays poised by the human visual system and then compare it against the specifications of state-of-the-art devices, which reasonably shows the main challenges in near-eye displays at the present stage. Afterward, potential solutions to address these challenges in both AR and VR displays are presented case by case, including the most recent optical research and development, which are already or have the potential to be industrialized for extended reality displays.

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“…High-NA metalenses have been achieved by controlling various degrees of freedom (Liu et al, 2018a;Decker et al, 2019;Khorasaninejad et al, 2016cKhorasaninejad et al, , 2017b. Structural and material optimization can yield metalenses that have near-unity NA (Kang et al, 2020;Kotlyar et al, 2019;Paniagua-Domínguez et al, 2018;Fan et al, 2018) or even NA > 1 (Liang et al, 2018;Huang et al, 2019); these overcome the limited NA of conventional diffractive lenses (Arbabi et al, 2015a;Engelberg and Levy, 2020;Meem et al, 2020). For example, metalenses with an ultra-high NA have been achieved using crystalline silicon nanostructures on sapphire substrates (Liang et al, 2018).…”

Section: Metalens Designmentioning

confidence: 99%

Recent Progress on Ultrathin Metalenses for Flat Optics

et al. 2020

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As technology advances, electrical devices such as smartphones have become more and more compact, leading to a demand for the continuous miniaturization of optical components. Metalenses, ultrathin flat optical elements composed of metasurfaces consisting of arrays of subwavelength optical antennas, provide a method of meeting those requirements. Moreover, metalenses have many other distinctive advantages including aberration correction, active tunability, and semi-transparency, compared to their conventional refractive and diffractive counterparts. Therefore, over the last decade, great effort has been focused on developing metalenses to investigate and broaden the capabilities of metalenses for integration into future applications. Here, we discuss recent progress on metalenses including their basic design principles and notable characteristics such as aberration correction, tunability, and multifunctionality.

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Large-area, high-numerical-aperture multi-level diffractive lens via inverse design

Cited by 65 publications

References 18 publications

Impact of fabrication errors and refractive index on multilevel diffractive lens performance

Impact of fabrication errors and refractive index on multilevel diffractive lens performance

Augmented Reality and Virtual Reality Displays: Perspectives and Challenges

Recent Progress on Ultrathin Metalenses for Flat Optics

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