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The image on the cover for Photonics Research Volume 10, Issue 7, demonstrates an on-chip path encoded photonic quantum Toffoli gate enabled by the 3D capability of the femtosecond laser direct writing (FLDW) for the first time, whose truth-table fidelity is higher than 85.5%. The image is based on original research by Meng Li et al. presented in their paper "On-chip path encoded photonic quantum Toffoli gate", Photonics Research 10 (7), 1533 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 7, presents a simple way to experimentally probe fluorescence quantum efficiency of single dibenzoterrylene molecules embedded in a thin anthracene microcrystal obtained through a co-sublimation process. The image is based on original research by Penglong Ren et al. presented in their paper "Probing fluorescence quantum efficiency of single molecules in an organic matrix by monitoring lifetime change during sublimation", Chinese Optics Letters 20 (7), 073602. (2022)

The image on the cover for Photonics Research Volume 10, Issue 6, proposes a broadband high-efficiency polarization-multiplexing method based on a geometric phase polymerized liquid crystal metasurface to yield the polarization-switchable functionalities in the visible. The image is based on original research by Xinjian Lu et al. presented in their paper "Broadband high-efficiency polymerized liquid crystal metasurfaces with spin-multiplexed functionalities in the visible", Photonics Research 10 (6), 1380 (2022).

The image on the cover for Chinese Optics Letters Volume 20, Issue 6, demonstrate an ultra-compact short-wave infrared (SWIR) multispectral detector chip by monolithically integrating the narrowband Fabry&ndash;Perot microcavities array with the InGaAs detector focal plane array. The image is based on original research by Zhiyi Xuan et al. presented in their paper " On-chip short-wave infrared multispectral detector based on integrated Fabry&ndash;Perot microcavities array", Chinese Optics Letters 20 (6), 061302. (2022)

Three-year-old journal ranked among top optics journals in first year of recognition.

On the Cover
Single-pixel imaging (SPI) is a novel imaging technique that has been widely studied in recent years. It retrieves spatial information of the target by using a single-pixel detector with no spatial resolution, minimizing the array size of imaging detector, that has unique advantage of making up for the shortcomings of the existing focal plane arrays (FPAs) imaging technology. It is believed that this SPI technology has great application value in special waveband imaging that array detector technology is underdeveloped or expensive.
Photonics Research
• Sep. 30, 2022
• Vol. 20, Issue 9 (2022)
Community-Publication
Physicists at the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL) have proposed the source of the sudden and puzzling collapse of heat that precedes disruptions that can damage doughnut-shaped tokamak fusion facilities. Coping with the source could overcome one of the most critical challenges that future fusion facilities will face and bring closer to reality the production on Earth of the fusion energy that drives the sun and stars.
High Power Laser Science and Engineering
• Sep. 30, 2022
• Vol. , Issue (2022)
On the Cover
The concept of rogue waves originated in oceanography, and refers to high-intensity waves with great destructive power that suddenly appear and disappear in the sea. Ocean-going ships, offshore drilling platforms and other facilities have records of being damaged by rogue waves. It is extremely difficult to study rogue waves in water environments such as oceans or tanks due to their unpredictable nature and numerous excitation conditions.
Chinese Optics Letters
• Sep. 30, 2022
• Vol. 20, Issue 8 (2022)
Editors' Picks
Since the discovery of flat bands and unconventional superconductivity at the magic angle in twisted bilayer graphene by Cao et al., a variety of related exotic phenomena including correlated insulating states and ferromagnetism has been investigated. Analogous twistronic concepts have been extended to phonon and plasmon polaritons in layered low-dimensional photonic materials.
Photonics Research
• Sep. 30, 2022
• Vol. 10, Issue 9 (2022)
Community-News
The 13th International Laser Operations Workshop (ILOW), held at LLNL from Aug. 30 to Sept. 1, brought together more than 70 representatives from 11 laser facilities to discuss recent achievements and share how they are responding to various challenges to improve their systems.
High Power Laser Science and Engineering
• Sep. 29, 2022
• Vol. , Issue (2022)
Anisotropic Fermat’s principle for controlling hyperbolic van der Waals polaritons

Transformation optics (TO) facilitates flexible designs of spatial modulation of optical materials via coordinate transformations, thus, enabling on-deman

Transformation optics (TO) facilitates flexible designs of spatial modulation of optical materials via coordinate transformations, thus, enabling on-demand manipulations of electromagnetic waves. However, the application of TO theory in control of hyperbolic waves remains elusive due to the spatial metric signature transition from ($+,+$) to ($-,+$) of a two-dimensional hyperbolic geometry. Here, we proposed a distinct Pythagorean theorem, which leads to establishing an anisotropic Fermat’s principle. It helps to construct anisotropic geometries and is a powerful tool for manipulating hyperbolic waves at the nanoscale and polaritons. Making use of absolute instruments, the excellent collimating and focusing behaviors of naturally in-plane hyperbolic polaritons in van der Waals $α–MoO3$ layers are demonstrated, which opens up a new way for polaritons manipulation.show less

• Oct.07，2022
• Photonics Research,Vol. 10, Issue 10
• B14 (2022)
Exciton binding energy and effective mass of CsPbCl3: a magneto-optical study: publisher’s note
• Oct.07，2022
• Photonics Research,Vol. 10, Issue 10
• 2447 (2022)
Ultrahigh frame rate digital light projector using chip-scale LED-on-CMOS technology

Digital light projector systems are crucial components in applications, including computational imaging, fluorescence microscopy, and highly parallel data

Digital light projector systems are crucial components in applications, including computational imaging, fluorescence microscopy, and highly parallel data communications. Current technology based on digital micromirror displays are limited to absolute frame rates in the few tens of kiloframes per second and require the use of external light sources and coupling optics. Furthermore, to realize gray-scale pixel values using duty cycle control, frame rates are reduced proportionally to the number of gray levels required. Here we present a self-emissive chip-scale projector system based on micro-LED pixels directly bonded to a smart pixel CMOS drive chip. The $128×128$ pixel array can project binary patterns at up to 0.5 Mfps and toggle between two stored frames at megahertz rates. The projector has a 5-bit gray-scale resolution that can be updated at up to 83 kfps, and can be held in memory as a constant bias for the binary pattern projection. Additionally, the projector can be operated in a pulsed mode, with individual pixels emitting pulses down to a few nanoseconds in duration. Again, this mode can be used in conjunction with the high-speed spatial pattern projection. As a demonstration of the data throughput achievable with this system, we present an optical camera communications application, exhibiting data rates of $>5 Gb/s$.show less

• Oct.07，2022
• Photonics Research,Vol. 10, Issue 10
• 2434 (2022)
Gain-enabled optical delay readout unit using CMOS-compatible avalanche photodetectors

A compact time delay unit is fundamental to integrated photonic circuits with applications in, for example, optical beam-forming networks, photonic equali

A compact time delay unit is fundamental to integrated photonic circuits with applications in, for example, optical beam-forming networks, photonic equalization, and finite and infinite impulse response optical filtering. In this paper, we report a novel gain-enabled delay readout system using a tunable optical carrier, low-frequency RF signal and CMOS-compatible photodetectors, suitable for silicon photonic integration. The characterization method relies on direct phase measurement of an input RF signal and thereafter extraction of the delay profile. Both integrated silicon and germanium photodetectors coupled with low-bandwidth electronics are used to characterize a microring resonator-based, true-time delay unit under distinct ring–bus coupling formats. The detectors, used in both linear and avalanche mode, are shown to be successful as optical-to-electrical converters and RF amplifiers without introducing significant phase distortion. For a Si–Ge separate-absorption-charge-multiplication avalanche detector, an RF amplification of 10 dB is observed relative to a Ge PIN linear detector. An all-silicon defect-mediated avalanche photodetector is shown to have a 3 dB RF amplification compared to the same PIN detector. All ring delay measurement results are validated by full-wave simulation. Additionally, the impact of photodetector biasing and system linearity is analyzed.show less

• Oct.07，2022
• Photonics Research,Vol. 10, Issue 10
• 2422 (2022)

For speckle-correlation-based scattering imaging, an iris is generally used next to the diffuser to magnify the speckle size and enhance the speckle contrast, which limits the light flu

For speckle-correlation-based scattering imaging, an iris is generally used next to the diffuser to magnify the speckle size and enhance the speckle contrast, which limits the light flux and makes the setup cooperative. Here, we experimentally demonstrate a non-iris speckle correlation imaging method associated with an image resizing process. The experimental results demonstrate that, by estimating an appropriate resizing factor, our method can achieve high-fidelity non-cooperative speckle correlation imaging by digital resizing of the raw captions or on-chip pixel binning without iris. The method opens a new door for non-cooperative high-frame-rate speckle correlation imaging and benefits scattering imaging for dynamic objects hidden behind opaque barriers. show less

• Oct.07，2022
• Chinese Optics Letters,Vol. 21, Issue 3
• (2023)

We demonstrate an ultra-stable miniaturized transportable laser system at 1550 nm by locking it to an optical fiber-delay-line (FDL). To achieve optimized long-term frequency stability,

We demonstrate an ultra-stable miniaturized transportable laser system at 1550 nm by locking it to an optical fiber-delay-line (FDL). To achieve optimized long-term frequency stability, the FDL was placed into a vacuum chamber with a five-layer thermal shield and a delicate two-stage active temperature stabilization, an optical power stabilization and a RF power stabilization are applied in the system. A fractional frequency stability of better than 3.2×10-15 at 1 s averaging time and 1.1×10-14 at 1000 s averaging time is achieved, which is the best long-term frequency stability of an all-fiber-based ultra-stable laser observed to date. show less

• Oct.07，2022
• Chinese Optics Letters,Vol. 21, Issue 3
• (2023)

Spatial terahertz wave modulators that can arbitrarily tailor the electromagnetic wavefront are highly demanded in nondestructive inspections and high capacity wireless communications.

Spatial terahertz wave modulators that can arbitrarily tailor the electromagnetic wavefront are highly demanded in nondestructive inspections and high capacity wireless communications. Here, we propose a liquid crystal integrated metadevice. It modulates the terahertz wave based on the adjustable electromagnetically induced transparency analog when spatially changing the environmental refractive index. The functions of the device can be arbitrarily programmed via photo-reorienting the directors of liquid crystals with a digital micromirror device based exposing system. The thin liquid crystal layer can be further driven by electric field, and thus the function can be rapidly switched. Amplitude modulation and the lens effect are demonstrated with modulation depths over 50% at 0.94 THz.show less

• Oct.07，2022
• Chinese Optics Letters,Vol. 21, Issue 1
• (2023)

In an acousto-optic modulator, the electrode shape plays an important role in the performance since it affects the distribution of the acoustic field. The acousto-optic modulator based

In an acousto-optic modulator, the electrode shape plays an important role in the performance since it affects the distribution of the acoustic field. The acousto-optic modulator based on conventional rectangular electrode has the problems of low energy efficiency and small modulation bandwidth due to imperfect acoustic field. In this paper, a new serrated periodic electrode has been proposed for using in acousto-optic modulator transducers. The proposed electrode has the following advantages: By using serrated periodic electrodes to suppress the side lobes, the collimation of the acoustic field in the direction perpendicular to the light incidence is improved. This makes the acousto-optic modulator have a stable diffraction efficiency fluctuation and high energy efficiency. In addition, the electrode has a large divergence angle in the direction of light incidence, so a large bandwidth can be obtained. The simulations and experiments demonstrated that the serrated periodic electrode have an increased bandwidth and high energy efficiency.show less

• Oct.07，2022
• Chinese Optics Letters,Vol. 21, Issue 3
• (2023)
The image on the cover for Photonics Research Volume 10, Issue 7, demonstrates an on-chip path encoded photonic quantum Toffoli gate enabled by the 3D capability of the femtosecond laser direct writing (FLDW) for the first time, whose truth-table fidelity is higher than 85.5%. The image is based on original research by Meng Li et al. presented in their paper "On-chip path encoded photonic quantum Toffoli gate", Photonics Research 10 (7), 1533 (2022).
• Journal
• 14th Sep，2022
The image on the cover for Chinese Optics Letters Volume 20, Issue 7, presents a simple way to experimentally probe fluorescence quantum efficiency of single dibenzoterrylene molecules embedded in a thin anthracene microcrystal obtained through a co-sublimation process. The image is based on original research by Penglong Ren et al. presented in their paper "Probing fluorescence quantum efficiency of single molecules in an organic matrix by monitoring lifetime change during sublimation", Chinese Optics Letters 20 (7), 073602. (2022)
• Journal
• 14th Sep，2022