Contents
2025
Volume: 7 Issue 3
8 Article(s)
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Reviews
Power consumption of light engines for emerging augmented reality glasses: perspectives and challenges
Yizhou Qian, Zhiyong Yang, Sung-Chun Chen, Yongziyan Ma, Yi-Chien Chen, Hsueh-Shih Chen, Chih-Lung Lin, and Shin-Tson Wu
Lightweight augmented reality (AR) eyeglasses have been increasingly integrated into human daily life for navigation, education, training, healthcare, digital twins, maintenance, and entertainment, just to name a few. To facilitate an all-day comfortable wearing, AR glasses must have a small form factor and be lightweiLightweight augmented reality (AR) eyeglasses have been increasingly integrated into human daily life for navigation, education, training, healthcare, digital twins, maintenance, and entertainment, just to name a few. To facilitate an all-day comfortable wearing, AR glasses must have a small form factor and be lightweight while keeping a sufficiently high ambient contrast ratio, especially under outdoor diffusive sunlight conditions and low power consumption to sustain a long battery operation life. These demanding requirements pose significant challenges for present AR light engines due to the relatively low efficiency of the optical combiners. We focus on analyzing the power consumption of five commonly employed microdisplay light engines for AR glasses, including micro-LEDs, OLEDs, liquid-crystal-on-silicon, laser beam scanning, and digital light processing. Their perspectives and challenges are also discussed. Finally, adding a segmented smart dimmer in front of the AR glasses helps improve the ambient contrast ratio and reduce the power consumption significantly..
Advanced Photonics
- Publication Date: Mar. 28, 2025
- Vol. 7, Issue 3, 034001 (2025)
Recent advances in femtosecond laser direct writing of three-dimensional periodic photonic structures in transparent materials
Bin Zhang, Wenchao Yan, and Feng Chen
The femtosecond laser direct writing technique is a highly precise processing method that enables the rapid fabrication of three-dimensional (3D) micro- and nanoscale photonic structures in transparent materials. By focusing ultrashort laser pulses into transparent optical materials, such as crystals and glasses, it isThe femtosecond laser direct writing technique is a highly precise processing method that enables the rapid fabrication of three-dimensional (3D) micro- and nanoscale photonic structures in transparent materials. By focusing ultrashort laser pulses into transparent optical materials, such as crystals and glasses, it is possible to efficiently modify specific optical properties, including refractive indices and ferroelectric domains, at the laser focus. By carefully designing and optimizing the movement trajectory of the femtosecond laser, one can achieve periodic modulation of the optical features of these materials in 3D space. The resulting changes in material properties are closely linked to both the processing parameters of the femtosecond laser and the types of materials used. Through ongoing optimization of these parameters, desired periodic photonic structures can be created in specific transparent optical materials, leading to the development of 3D nonlinear photonic crystals (NPCs) and 3D waveguide arrays. Femtosecond laser direct writing breaks through the limitations of traditional techniques to fabricate 3D NPCs [e.g., 3D lithium niobate (LiNbO3) NPCs] and complex waveguide arrays (e.g., 3D helical waveguide arrays), realizing a paradigm shift in the fabrication of complex periodic photonic structures. To date, femtosecond-laser-written 3D NPCs and waveguide arrays have found extensive applications in integrated photonics, nonlinear optics, quantum optics, and topological photonics. We highlight recent advancements in femtosecond-laser-written 3D NPCs and waveguide arrays, such as pivotal breakthroughs in the fabrication of nanoscale-resolution 3D NPCs in LiNbO3. Finally, several potential research directions, such as the formation mechanism of domain wall and inducing millimeter-scale domain inversion with femtosecond Bessel beam, have been proposed at the end of this article..
Advanced Photonics
- Publication Date: Apr. 15, 2025
- Vol. 7, Issue 3, 034002 (2025)
Recent advances in tin perovskites and their applications
Feng Yang, Yu Tong, Kun Wang, Yali Chen, Ziyong Kang, and Hongqiang Wang
Lead halide perovskites have started a new era for solar cells. However, the toxicity of lead poses a challenge for their practical applications. Replacing lead with tin provides a feasible way to reduce the toxicity of lead perovskites and can further promote the applications of perovskites. Due to their reduced toxicLead halide perovskites have started a new era for solar cells. However, the toxicity of lead poses a challenge for their practical applications. Replacing lead with tin provides a feasible way to reduce the toxicity of lead perovskites and can further promote the applications of perovskites. Due to their reduced toxicity with advantageous optical and electronic properties compared to their lead counterparts, tin (II) perovskites (TiPes) have attracted significant interest in recent years, not only for pursuing high-performance solar cells but also in other application fields. We aim to provide a comprehensive overview of recent advances in TiPes, covering fundamental crystal structure, optoelectronic properties, fabrication methods, and applications. A detailed comparison with lead perovskites is included, emphasizing TiPes’ unique strengths while presenting their application challenges. Finally, potential solutions to the challenges are proposed, along with a vision for their future development and potential..
Advanced Photonics
- Publication Date: May. 09, 2025
- Vol. 7, Issue 3, 034003 (2025)
Letters
Observation of robust subwavelength phase singularity in chiral medium
Jun-Hee Park, Jeongho Ha, Liyi Hsu, Guang Yang, Yeshaiahu Fainman, Alexander V. Sergienko, and Abdoulaye Ndao
Photonic devices that exhibit both sensitivity and robustness have long been sought; yet, these characteristics are thought to be mutually exclusive; through sensitivity, a sensor responds to external stimuli, whereas robustness embodies the inherent ability of a device to withstand weathering by these same stimuli. ThPhotonic devices that exhibit both sensitivity and robustness have long been sought; yet, these characteristics are thought to be mutually exclusive; through sensitivity, a sensor responds to external stimuli, whereas robustness embodies the inherent ability of a device to withstand weathering by these same stimuli. This challenge stems from the inherent contradiction between robustness and sensitivity in wave dynamics, which require the coexistence of noise-immune sensitive states and modulation-sensitive transitions between these states. We report and experimentally demonstrate a subwavelength phase singularity in a chiral medium that is resilient to fabrication imperfections and disorder while remaining highly responsive to external stimuli. The combination of subwavelength light confinement and its robustness lays the foundation for the development of hitherto unexplored chip-scale photonics devices, enabling a simultaneous development of high-sensitivity and robust devices in both quantum and classical realms..
Advanced Photonics
- Publication Date: Mar. 17, 2025
- Vol. 7, Issue 3, 035001 (2025)
Research Articles
Exploring uncharted multiband hyperbolic dispersion in conjugated polymers: a first-principles study
Suim Lim, Dong Hee Park, Bin Chan Joo, Yeon Ui Lee, and Kanghoon Yim
Hyperbolic materials are highly anisotropic optical media that provide valuable assistance in emission engineering, nanoscale light focusing, and scattering enhancement. Recently discovered organic hyperbolic materials (OHMs) with exceptional biocompatibility and tunability offer promising prospects as next-generation Hyperbolic materials are highly anisotropic optical media that provide valuable assistance in emission engineering, nanoscale light focusing, and scattering enhancement. Recently discovered organic hyperbolic materials (OHMs) with exceptional biocompatibility and tunability offer promising prospects as next-generation optical media for nanoscopy, enabling superresolution bioimaging capabilities. Nonetheless, an OHM is still less accessible to many researchers because of its rarity and narrow operating wavelength range. Here, we employ first-principles calculations to expand the number of known OHMs, including conjugated polymers with multiple assembly units. Through the systematic investigation of structural and optical properties of the target copolymers, we discover extraordinary multiband hyperbolic dispersions from candidate OHMs. This approach provides a new perspective on the molecular-scale design of broadband, low-loss OHMs. It aids in identifying potential hyperbolic material candidates applicable to optical engineering and super-resolution bioimaging, offering new insights into nanoscale light–matter interactions..
Advanced Photonics
- Publication Date: Mar. 13, 2025
- Vol. 7, Issue 3, 036001 (2025)
Real-time measurement of non-Hermitian Landau–Zener tunneling near band crossings
Lange Zhao, Shulin Wang, Chengzhi Qin, Bing Wang, Han Ye, Weiwei Liu, Stefano Longhi, and Peixiang Lu
Landau–Zener (LZ) tunneling, i.e., the nonadiabatic level transition under strong parameter driving, is a fundamental concept in modern quantum mechanics. With the advent of non-Hermitian physics, research interest has been paid to the LZ tunneling involving level dissipations. However, experimental demonstrations of sLandau–Zener (LZ) tunneling, i.e., the nonadiabatic level transition under strong parameter driving, is a fundamental concept in modern quantum mechanics. With the advent of non-Hermitian physics, research interest has been paid to the LZ tunneling involving level dissipations. However, experimental demonstrations of such an interesting non-Hermitian LZ problem remain yet elusive. By harnessing a synthetic temporal lattice using a fiber-loop circuit, we report on the first real-time measurement of non-Hermitian LZ tunneling in a dissipative two-band lattice model. An innovative approach based on mode interference is developed to measure the transient band occupancies, providing a powerful tool to explore the non-Hermitian LZ tunneling dynamics in non-orthogonal eigenmodes. We find that the loss does not change the final LZ tunneling probability but can highly affect the tunneling process by modifying the typical band occupancies oscillation behaviors. We initiate exploring intriguing LZ physics and measurements beyond the standard Hermitian paradigm, with potential applications in coherent quantum control and quantum technologies..
Advanced Photonics
- Publication Date: Apr. 11, 2025
- Vol. 7, Issue 3, 036002 (2025)
Breaking the diffraction limit in molecular imaging by structured illumination mid-infrared photothermal microscopy
Pengcheng Fu, Bo Chen, Yongqing Zhang, Liangyi Chen, Hyeon Jeong Lee, and Delong Zhang
Super-resolution microscopy techniques have revolutionized biological imaging by breaking the optical diffraction limit, yet most methods rely on fluorescent labels that provide limited chemical information. Although vibrational imaging based on Raman and infrared (IR) spectroscopy offers intrinsic molecular contrast, Super-resolution microscopy techniques have revolutionized biological imaging by breaking the optical diffraction limit, yet most methods rely on fluorescent labels that provide limited chemical information. Although vibrational imaging based on Raman and infrared (IR) spectroscopy offers intrinsic molecular contrast, achieving both high spatial resolution and high chemical specificity remains challenging due to weak signal levels. We demonstrate structured illumination mid-infrared photothermal microscopy (SIMIP) as an emerging imaging platform that provides chemical bond selectivity and high-speed, widefield detection beyond the diffraction limit. By modulating fluorescence quantum yield through vibrational infrared absorption, SIMIP enables both nanoscale spatial resolution and high-fidelity IR spectral acquisition. The synergy of enhanced resolution and chemical specificity positions SIMIP as a versatile tool for studying complex biological systems and advanced materials, offering new opportunities across biomedicine and materials science..
Advanced Photonics
- Publication Date: Apr. 13, 2025
- Vol. 7, Issue 3, 036003 (2025)
Toward the meta-atom library: experimental validation of machine learning-based Mie-tronics
Hooman Barati Sedeh, Renee C. George, Fangxing Lai, Hao Li, Wenhao Li, Yuruo Zheng, Dmitrii Tstekov, Jiannan Gao, Austin Moore, Jesse Frantz, Jingbo Sun, Shumin Xiao, and Natalia M. Litchinitser
Although predicting light scattering by homogeneous spherical particles is a relatively straightforward problem that can be solved analytically, manipulating and studying the scattering behavior of non-spherical particles is a more challenging and time-consuming task, with a plethora of applications ranging from opticaAlthough predicting light scattering by homogeneous spherical particles is a relatively straightforward problem that can be solved analytically, manipulating and studying the scattering behavior of non-spherical particles is a more challenging and time-consuming task, with a plethora of applications ranging from optical manipulation to wavefront engineering, and nonlinear harmonic generation. Recently, physics-driven machine learning (ML) has proven to be instrumental in addressing this challenge. However, most studies on Mie-tronics that leverage ML for optimization and design have been performed and validated through numerical approaches. Here, we report an experimental validation of an ML-based design method that significantly accelerates the development of all-dielectric complex-shaped meta-atoms supporting specified Mie-type resonances at the desired wavelength, circumventing the conventional time-consuming approaches. We used ML to design isolated meta-atoms with specific electric and magnetic responses, verified them within the quasi-normal mode expansion framework, and explored the effects of the substrate and periodic arrangements of such meta-atoms. Finally, we proposed implementing the designed meta-atoms to generate a third harmonic within the vacuum ultraviolet spectrum. Because the implemented method allowed for the swift transition from design to fabrication, the optimized meta-atoms were fabricated, and their corresponding scattering spectra were measured..
Advanced Photonics
- Publication Date: Apr. 25, 2025
- Vol. 7, Issue 3, 036004 (2025)
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