Orad Reshef

University of Ottawa

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Robert W. Boyd

University of Rochester

Eric Mazur

Harvard University

Ksenia Dolgaleva

University of Ottawa

M. Zahirul Alam

University of Nottingham

Jeremy Upham

University of Ottawa

Mikko J. Huttunen

Tampere University

Jean‐Michel Ménard

University of Ottawa

Daryl I. Vulis

Harvard University

M. Saad Bin-Alam

National Research Council Canada

Marko Lončar

Harvard University

Cooperative Institutions

University of Ottawa

Harvard University

Harvard University Press

University of Southern California

Max Planck - University of Ottawa Centre for Extreme and Quantum Photonics

McGill University

Southern California University for Professional Studies

École Polytechnique Fédérale de Lausanne

University of Rochester

Centre National de la Recherche Scientifique

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Engineering Local Fields in Nonlinear Plasmonic Metasurfaces -INVITED

EPJ Web of Conferences (2020)

Mikko J. Huttunen Saad Bin-Alam Orad Reshef Yaryna Mamchur Timo Stolt

Nonlinear optical phenomena are paramount in many photonic applications ranging from frequency broadening and generation of ultrashort pulses to frequency comb-based metrology. A recent trend has been to miniaturize photonic components, resulting also in a demand for small scale nonlinear components. This demand is difficult to address by using conventional materials motivating the search for alternative approaches. Nonlinear plasmonic metasurface cavities have recently emerged as a promising platform to enable nanoscale nonlinear optics. Despite steady progress, the so far achieved conversion efficiencies have not yet rivalled conventional materials. Here, we discuss our recent work to develop more efficient nonlinear metamaterials, focusing on plasmonic metasurfaces supporting collective responses known as surface lattice resonances. These resonances can exhibit very narrow spectral features, showing potential to considerably enhance nonlinear processes via resonant interactions. We demonstrate a plasmonic metasurface operating at the telecommunications C band that exhibits a record-high quality factor close to 2400, demonstrating an order-of-magnitude improvement compared to existing metasurface cavities. Motivated by this experimental demonstration, we also present numerical predictions suggesting that such metasurfaces could soon answer the existing demand for miniaturized and/or flat nonlinear components.

10.1051/epjconf/202023811002

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Nonlinear Optics

CRC Press eBooks (2021)

Orad Reshef Robert W. Boyd

Nonlinear optics is the study of the interaction of light with matter under conditions such that the linear superposition principle is not valid. The origin of this breakdown of the linear superposition principle can usually be traced to a modification of the optical properties of the material medium induced by the presence of an intense optical field. It should be noted that only very fast physical mechanisms can lead to an appreciable response for processes in which the output frequency is different from the input frequencies, because, in order for such processes to occur, the material has to be able to respond at the difference frequencies of the various interacting fields. The molecular orientation effect occurs in anisotropic molecules and leads to a nonlinear optical response as a consequence of the tendency of molecules to become aligned along the electric field vector of the incident laser field.

10.1201/b21828-7

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Broadband bandpass THz filters with stacked metasurfaces

OSA Advanced Photonics Congress 2021 (2021)

Ali Maleki Ahmed Jaber Avinash Singh Yongbao Xin Jean‐Michel Guay

We present a stacked metasurface device with broad bandpass filtering properties in the terahertz region. The design, optimized with numerical simulations and characterized experimentally, features high transmission over a >1 THz spectral range.

10.1364/noma.2021.nom4c.4

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Nonlinear Optics in TiO2 Nanoscale Waveguides

NATO science for peace and security series. B, Physics and biophysics (2017)

Sarah Griesse-Nascimento Orad Reshef Michael Moebius Christopher C. Evans Eric Mazur

Waveguide

Two-Photon Absorption

10.1007/978-94-024-0850-8_29

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To what extent can space be compressed? Bandwidth limits of spaceplates

Optica (2022)

Kunal Shastri Orad Reshef Robert W. Boyd Jeff S. Lundeen Francesco Monticone

Spaceplates are novel flat-optic devices that implement the optical response of a free-space volume over a smaller length, effectively “compressing space” for light propagation. Together with flat lenses such as metalenses or diffractive lenses, spaceplates have the potential to enable the miniaturization of any free-space optical system. While the fundamental and practical bounds on the performance metrics of flat lenses have been well studied in recent years, a similar understanding of the ultimate limits of spaceplates is lacking, especially regarding the issue of bandwidth, which remains as a crucial roadblock for the adoption of this platform. In this work, we derive fundamental bounds on the bandwidth of spaceplates as a function of their numerical aperture and compression ratio (ratio by which the free-space pathway is compressed). The general form of these bounds is universal and can be applied and specialized for different broad classes of space-compression devices, regardless of their particular implementation. Our findings also offer relevant insights into the physical mechanism at the origin of generic space-compression effects and may guide the design of higher performance spaceplates, opening new opportunities for ultra-compact, monolithic, planar optical systems for a variety of applications.

Free space

10.1364/optica.455680

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Ultra-High-Q (≈2400) Lattice Resonances in Plasmonic Metasurface for Flat Optics

OSA Optical Design and Fabrication 2021 (Flat Optics, Freeform, IODC, OFT) (2021)

M. Saad Bin-Alam Orad Reshef Yaryna Mamchur M. Zahirul Alam Graham Carlow

We experimentally demonstrate an ultra-high Q -factor ( ≈ 2400) surface lattice resonance in a plasmonic metasurface, that can be a great platform for highly-efficient flat optical applications e . g . biosensors, nanolasers, and metalenses.

Lattice (music)

10.1364/flatoptics.2021.fm3c.4

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Tightly-confined, long-range hybrid polaritonic modes for high-efficiency nonlinear guided wave interactions in gold and ITO bi-films

Saumya Choudhary Saleem Iqbal Orad Reshef Mohammad Karimi M. Zahirul Alam

We demonstrate tightly-confined hybrid-polaritons formed by the strong-coupling of SPP and ENZ modes in gold and indium tin oxide bi-films that can propagate for several microns, and offer a platform for integrating ENZ with waveguides.

Indium tin oxide

10.1364/nlo.2021.nm2a.4

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Designing high-performance propagation-compressing spaceplates using thin-film multilayer stacks

Optics Express (2021)

Jordan T. R. Pagé Orad Reshef Robert W. Boyd Jeff S. Lundeen

The development of metasurfaces has enabled unprecedented portability and functionality in flat optical devices. Spaceplates have recently been introduced as a complementary element to reduce the space between individual metalenses, which will further miniaturize entire imaging devices. However, spaceplates necessitate an optical response which depends on the transverse spatial frequency component of a light field - therefore making it challenging both to design them and to assess their ultimate performance and potential. Here, we employ inverse-design techniques to explore the behaviour of general thin-film-based spaceplates. We observe a tradeoff between the compression factor R and the numerical aperture NA of such devices; we obtained a compression factor of R=5.5 for devices with an NA = 0.42, and up to a record R=340 with NA of 0.017. Our work illustrates that even simple designs consisting of realistic materials (i.e., silicon and glass) permit capable spaceplates for monochromatic applications.

Software portability

Numerical aperture

Aperture (computer memory)

Monochromatic color

10.1364/oe.443067

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Frequency conversion through time refraction using an epsilon-near-zero material

Conference on Lasers and Electro-Optics (2019)

Yiyu Zhou Mohammad Karimi Jeremy Upham Orad Reshef Cong Liu

We report a large and tunable frequency shifting over 14.8 THz bandwidth of an infrared probe beam through time refraction in indium tin oxide (ITO) in its epsilon-near-zero region. The sign of the frequency change can be controlled by adjusting the delay between a pump and the probe. © 2019 The Author(s)

Indium tin oxide

Zero (linguistics)

Frequency Conversion

10.23919/cleo.2019.8749660

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A Space Compression Optic

Conference on Lasers and Electro-Optics (2020)

Michael P. DelMastro Orad Reshef Katherine K. M. Bearne Ali Alhulaymi Lambert Giner

We theoretically introduce a new optic, a plate that reduces propagation length for image formation. We experimentally demonstrate it advances a beam’s focus and shifts an obliquely incident beam identically to a longer propagation distance.

10.1364/cleo_qels.2020.fw4q.4

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