Featured
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Direct observation of Landau levels in silicon photonic crystals
Photonic Landau levels are demonstrated via a strain-induced pseudomagnetic field in a silicon photonic crystal slab.
- Maria Barsukova
- , Fabien Grisé
- & Mikael C. Rechtsman
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News & Views |
The dawn of chimera optical resonators
Nonlinear optical resonators allow the coherent conversion of photons, yet fabrication tolerances limit their wavelength accuracy. Introducing periodic modulation in ring resonators is shown to allow robust and predictable selection of the converted photons.
- Alfredo De Rossi
- & Sylvain Combrié
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News & Views |
Reciprocal topological photonic crystals allow backscattering
Topological photonics has promised new devices that are resistant to backscattering, leading to lower loss, greater nonlinearity, and smaller footprint. New research shows that in reciprocal photonic crystals, backscattering is unavoidable, implying that breaking reciprocity is essential to leveraging photonic Chern insulators.
- Mikael C. Rechtsman
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Article
| Open Access
Brilliant whiteness in shrimp from ultra-thin layers of birefringent nanospheres
The strong birefringence of liquid crystalline nanospheres in the body of the Pacific cleaner shrimp enables brilliant whiteness by overcoming undesirable optical crowding effects.
- Tali Lemcoff
- , Lotem Alus
- & Benjamin A. Palmer
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Article
| Open Access
Observation of strong backscattering in valley-Hall photonic topological interface modes
This work investigates the real-world value of topological protection in reciprocal photonics. Measurements of propagation losses in the slow-light regime of valley-Hall topological waveguides yield no indications of topological protection against backscattering on structural defects.
- Christian Anker Rosiek
- , Guillermo Arregui
- & Søren Stobbe
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Letter |
Topological-cavity surface-emitting laser
Researchers demonstrate a topological-cavity surface-emitting laser with a 10 W peak power and sub-degree beam divergence at 1,550 nm wavelength. The system is also capable of multiple-wavelength arrays.
- Lechen Yang
- , Guangrui Li
- & Ling Lu
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Article |
Electrically controlled on-demand photon transfer between high-Q photonic crystal nanocavities on a silicon chip
Researchers demonstrate the transfer of photons from one storage nanocavity into another by applying a voltage pulse. A transfer efficiency of 76% is achieved.
- Masahiro Nakadai
- , Takashi Asano
- & Susumu Noda
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Article |
Ultra-coherent Fano laser based on a bound state in the continuum
Quantum noise is suppressed by a bound state in the continuum (BIC) approach, enabling a microlaser with narrow linewidth compared to other small lasers.
- Yi Yu
- , Aurimas Sakanas
- & Jesper Mørk
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Article |
Photonic-crystal lasers with two-dimensionally arranged gain and loss sections for high-peak-power short-pulse operation
By using engineered gain and loss sections in a photonic crystal laser, pulses with a peak power of ~20 W and pulse width of ~35 ps have been experimentally demonstrated and even higher peak power operation (>300 W) has been theoretically predicted.
- Ryohei Morita
- , Takuya Inoue
- & Susumu Noda
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Article |
Photonic crystal optical parametric oscillator
Photonic crystal-based optical parametric oscillators have remained elusive but have finally been demonstrated. Operating at telecom wavelengths, the source may prove particularly useful in quantum optics applications.
- Gabriel Marty
- , Sylvain Combrié
- & Alfredo De Rossi
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Letter |
Seven-octave high-brightness and carrier-envelope-phase-stable light source
Using a gas-filled anti-resonant-reflection photonic-crystal fibre, a high-brightness table-top source of coherent carrier-envelope-phase-stable waveforms is demonstrated across seven octaves (340 nm to 40,000 nm) with ultraviolet peak powers up to 2.5 MW and terahertz peak powers of 1.8 MW, without the need for changing nonlinear crystals.
- Ugaitz Elu
- , Luke Maidment
- & Jens Biegert
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Review Article |
Deep learning for the design of photonic structures
The application of deep learning to the design of photonic structures and devices is reviewed, including algorithm fundamentals.
- Wei Ma
- , Zhaocheng Liu
- & Yongmin Liu
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News & Views |
Topology in momentum space becomes real
Using topological singular points, the topological charge of photonic crystals in momentum space is successfully transferred to optical vortex beams in real space.
- Masaya Notomi
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Article |
Generating optical vortex beams by momentum-space polarization vortices centred at bound states in the continuum
Optical vortices can be generated by applying the winding behaviour of resonances in the momentum space of a photonic crystal slab, which naturally exists and is associated with bound states in the continuum, to modify the phase front of a beam.
- Bo Wang
- , Wenzhe Liu
- & Jian Zi
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Article |
Terahertz topological photonics for on-chip communication
Robust terahertz wave transport is demonstrated on a silicon chip using the valley Hall topological phase. Error-free communication is achieved at a data rate of 11 Gbit s−1, enabling real-time transmission of uncompressed 4K high-definition video.
- Yihao Yang
- , Yuichiro Yamagami
- & Ranjan Singh
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Article |
Flat optics for image differentiation
Vertical integration of a metalens to realize compound nanophotonic systems for optical analog image processing is realized, significantly reducing the size and complexity of conventional optical systems.
- You Zhou
- , Hanyu Zheng
- & Jason Valentine
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Letter |
Synthesizing multi-dimensional excitation dynamics and localization transition in one-dimensional lattices
The behaviour of multi-dimensional excitation dynamics and localization transition is synthesized in one-dimensional lattices formed by planar photonic structures.
- Lukas J. Maczewsky
- , Kai Wang
- & Andrey A. Sukhorukov
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Article |
Higher-order topological states in photonic kagome crystals with long-range interactions
One- and zero-dimensional optical states are revealed in photonic higher-order topological insulators.
- Mengyao Li
- , Dmitry Zhirihin
- & Alexander B. Khanikaev
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Article |
Femtofarad optoelectronic integration demonstrating energy-saving signal conversion and nonlinear functions
A photonic-crystal platform enables attojoule-energy electro-optic modulators and amplifier-free photoreceivers.
- Kengo Nozaki
- , Shinji Matsuo
- & Masaya Notomi
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Letter |
Experimental quantum fast hitting on hexagonal graphs
A quantum walker on a hexagonal glued array of optical waveguides is made inside a glass substrate. The optimal hitting time increases linearly with the layer depth, giving a quadratic speed-up over the hitting performance by classical random walks.
- Hao Tang
- , Carlo Di Franco
- & Xian-Min Jin
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News & Views |
A new dimension for nonlinear photonic crystals
The first three-dimensional nonlinear photonic crystals have been constructed thanks to the use of femtosecond laser writing in quadratic nonlinear materials.
- Shay Keren-Zur
- & Tal Ellenbogen
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Letter |
Experimental demonstration of a three-dimensional lithium niobate nonlinear photonic crystal
By selectively erasing the nonlinear coefficients in a lithium niobate crystal using a femtosecond laser, a 3D nonlinear photonic crystal, with an effective conversion efficiency comparable to that of the typical quasi-phase-matching processes, is demonstrated.
- Dunzhao Wei
- , Chaowei Wang
- & Min Xiao
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Letter |
Three-dimensional nonlinear photonic crystal in ferroelectric barium calcium titanate
A three-dimensional nonlinear photonic crystal in ferroelectric barium calcium titanate that enables phase matching of nonlinear processes along an arbitrary direction, thereby removing constraints imposed by low-dimensional structures, is experimentally realized.
- Tianxiang Xu
- , Krzysztof Switkowski
- & Wieslaw Krolikowski
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Letter |
Experimental observation of a polarization vortex at an optical bound state in the continuum
Previous predictions that light radiated by modes around a bound state in the continuum (BIC) condition should exhibit a vortex in the far-field polarization profile are experimentally confirmed. The findings shed light on the origin of BICs.
- Hugo M. Doeleman
- , Francesco Monticone
- & A. Femius Koenderink
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Article |
Topological protection of photonic mid-gap defect modes
Eigenmodes of photonic crystal defects have now been topologically protected in an experimental demonstration that also shows how to minimize the mode volume.
- Jiho Noh
- , Wladimir A. Benalcazar
- & Mikael C. Rechtsman
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Article |
Vacuum Bloch–Siegert shift in Landau polaritons with ultra-high cooperativity
The Bloch–Siegert shift—a strong-field phenomenon that implies a failure of the rotating-wave approximation—is observed in the polariton dispersion diagram of a two-dimensional electron gas system inside a high-Q terahertz photonic crystal cavity.
- Xinwei Li
- , Motoaki Bamba
- & Junichiro Kono
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Article |
Hydroxypropyl cellulose photonic architectures by soft nanoimprinting lithography
Biodegradable cellulose-based photonic and plasmonic architectures are fabricated via soft nanoimprinting lithography, and are used for structural colour generation, photoluminescence enhancement and as disposable surface-enhanced Raman scattering substrates.
- André Espinha
- , Camilla Dore
- & Agustín Mihi
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Article |
Phonon scattering inhibits simultaneous near-unity efficiency and indistinguishability in semiconductor single-photon sources
The efficiency and indistinguishability of single-photon emission by a quantum dot optically coupled to a microcavity and to a waveguide are theoretically investigated. Owing to unavoidable phonon sideband, they can never reach 100% simultaneously.
- Jake Iles-Smith
- , Dara P. S. McCutcheon
- & Jesper Mørk
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Article |
Photon-trapping microstructures enable high-speed high-efficiency silicon photodiodes
Light-trapping nanoscale holes are exploited to improve the speed and efficiency of silicon photodiodes with intrinsic layers less than 2 μm thick.
- Yang Gao
- , Hilal Cansizoglu
- & M. Saif Islam
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Article |
Three-dimensional all-dielectric photonic topological insulator
The theoretical study of a 3D photonic topological metacrystal based on an all-dielectric metamaterial platform shows robust propagation of surface states along 2D domain walls, making it a promising solution for photonics applications. The proposed metacrystal design might also open the way for the observation of elusive fundamental physical phenomena.
- Alexey Slobozhanyuk
- , S. Hossein Mousavi
- & Alexander B. Khanikaev
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News & Views |
Strength in diversity
Progress in the development of highly sensitive biosensors and tailored thermal emission were two highlights of the 2016 PECS conference on photonic crystals in York, UK.
- Oliver Graydon
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News & Views |
Strong coupling of light goes nuclear
Evidence of strongly enhanced coupling of light with nuclei offers the potential to extend applied quantum optics to the hard X-ray regime.
- Brendan Dromey
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Letter |
Collective strong coupling of X-rays and nuclei in a nuclear optical lattice
Strong coupling between X-rays and matter excitations in arrays of alternating 57Fe and 56Fe layers is demonstrated. The results may open the door to X-ray quantum optics and strong coupling phenomena.
- Johann Haber
- , Kai S. Schulze
- & Ralf Röhlsberger
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Letter |
Self-homodyne measurement of a dynamic Mollow triplet in the solid state
Intrinsic Fano interference in a strongly coupled quantum dot/photonic crystal cavity system is controlled to remove most of the coherently scattered light. This result leads to the first experimental observation of the dynamic Mollow triplet.
- Kevin A. Fischer
- , Kai Müller
- & Jelena Vučković
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News & Views |
Symmetry breaking in laser cavities
The ability to invoke and switch between asymmetric lasing states in two coupled cavities built in a nonlinear photonic crystal creates opportunities for a new form of optical memory.
- Boris A. Malomed
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Letter |
Spontaneous mirror-symmetry breaking in coupled photonic-crystal nanolasers
The observation of symmetry breaking in a coupled nanolaser system could yield new types of switchable devices.
- Philippe Hamel
- , Samir Haddadi
- & Alejandro M. Yacomotti
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News & Views |
Choose your own interaction
Photonic crystal structures enable the controlled creation of long-range atomic interactions and may be a powerful tool for quantum simulation when combined with laser-cooled atoms.
- Jeff Thompson
- & Manuel Endres
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Observation of Landau levels and chiral edge states in photonic crystals through pseudomagnetic fields induced by synthetic strain
Efficient thermophotovoltaics
Nano goes big
Photonic crystal thermal emitters
Topological effect
Fully tunable
Artificial magnetic fields