Science AI Journal
Engineering · Research topic

Open research questions in Photonic and Optical Devices

70 unresolved questions extracted from the limitations and future-work sections of 239 Photonic and Optical Devices papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Silicon's high dielectric constant and conductive losses at millimeter wave frequencies. The need for hermetic sealing and long-term vacuum stability. The challenge of achieving reliable Rydberg excitation and electrometry.

    Batch-fabrication of all-dielectric vapor cells enabling optically addressed Rydberg atom electrometry · 2026 · DOI

  • exploring the use of different materials for vapor cell fabrication, - investigating the potential applications of Rydberg-atom electrometry in various fields

    Batch-fabrication of all-dielectric vapor cells enabling optically addressed Rydberg atom electrometry · 2026 · DOI

  • Mechanical gyroscopes have limitations, such as moving parts and g-sensitivity. Optical gyroscopes, including ring resonators, have limitations in terms of signal-to-noise ratio and precision of angular rotation rate.

    Development of a Chip-Scale Optical Gyroscope with Weak Measurement Amplification Readout · 2026 · DOI

  • The challenge of efficiently combining light from multiple sub-apertures in modular telescope architectures. The difficulty of preserving étendue conservation while efficiently coupling several multimode telescope feeds into a single multimode output waveguide. The need to account for possible insertion losses introduced by the splice in the characterization process.

    Demonstration of a multimode-to-multimode photonic lantern for astronomy · 2026 · DOI

  • Further development of modular telescope architectures - Exploration of the application of MM-PLs in other fields - Investigation of the scalability of the MM-PL design

    Demonstration of a multimode-to-multimode photonic lantern for astronomy · 2026 · DOI

  • Although fiber-to-chip self-coupling based on the NIR LISW technique has been reported, the loss assessment of NIR LISW optical self-coupling between a spot-size converter (SSC) and standard single-mode fiber (SSMF) has not been investigated.

    Near-infrared self-written waveguide spot size converter for single- and multichannel fiber-to-chip self-coupling · 2026 · DOI

  • By identifying and summarizing such challenges and opportunities, we aim to stimulate further research on devices, circuits, and systems for the silicon photonics ecosystem.

    Roadmapping the next generation of silicon photonics · 2024 · DOI

  • Highly precise thermal characterization methods of the micro-nano regions within electronic devices remain challenging. Existing methods are constrained by the optical diffraction limit or have limitations in spatial resolution, electromagnetic interference, and other factors.

    In-Situ Temperature Measurement and Scanning Thermal Imaging Based on Micro-Nano QDs Fluorescence Near-Field Fiber Optic Probe · 2026 · DOI

  • Further optimization of the device design and fabrication process. Investigation of the device's performance in various applications. Exploration of the device's potential in other fields, such as quantum communication.

    Polarization-Insensitive Y-Junction Power Splitter on Lithium Niobate-on-Insulator Platform · 2026 · DOI

  • Conventional multimode interference couplers and directional couplers have limitations. There is a need for a broadband, compact, and polarization-independent power splitter.

    Polarization-Insensitive Y-Junction Power Splitter on Lithium Niobate-on-Insulator Platform · 2026 · DOI

  • The persistent challenge of optical feedback remains a critical obstacle to achieving stable monolithic integration. The standard remedy has been the inclusion of optical isolators.

    Bridging the gap in silicon photonics: quantum dot lasers and the end of the optical isolator · 2026 · DOI

  • The existing dual-wavelength lasers with fixed wavelengths struggle to cover the demands of multi-spectral detection and reconfigurable systems. The need for a widely tunable, narrow-linewidth dual-wavelength laser.

    Narrow-Linewidth, Multimode-Background-Suppressed Dual-Wavelength Ti: sapphire Laser Based on a Composite Prism-Grating Feedback Structure · 2026 · DOI

  • Further optimization of the spectral purity and indistinguishability of photons. Investigation of the application of the results to photonic quantum technologies.

    Optimized spectral purity of unfiltered photons via pump and nonlinearity shaping · 2026 · DOI

  • The need for high spectral purity and indistinguishability of photons without spectral filtering. The limitation of prior work in achieving high two-photon interference visibility without spectral filtering.

    Optimized spectral purity of unfiltered photons via pump and nonlinearity shaping · 2026 · DOI

  • The platform is limited to telecom-band detection. The design concepts are extensible to shorter wavelengths but require appropriate III-V absorber materials.

    A Wafer-Scale Heterogeneous III-V-on-Silicon Nitride Quantum Photonic Platform · 2026

  • Further integration of electronic components for compact quantum photonic systems. Exploration of shorter wavelengths using appropriate III-V absorber materials.

    A Wafer-Scale Heterogeneous III-V-on-Silicon Nitride Quantum Photonic Platform · 2026

  • Microcavities with a high quality factor introduce a trade-off between generation efficiency and photon bandwidth. The paper aims to address this challenge.

    Integrated time-bin entangled quantum light source on a 4H-SiC microring chip · 2026

  • The paper is based on simulation/emulation, with physical characterization pending. The dataset is limited to 90,000 inference steps and 300 high-resolution validation steps.

    Predictive Software Scheduling as an Early-Warning Hint Layer for Optical Engine Thermal Drift in Heterogeneous SoIC Packaging · 2026

  • Existing approaches rely on closed-loop feedback, which can be slow and ineffective. There is a need for a predictive software scheduling technique to address thermal drift.

    Predictive Software Scheduling as an Early-Warning Hint Layer for Optical Engine Thermal Drift in Heterogeneous SoIC Packaging · 2026

  • The abrupt discontinuity at the air-gap interfaces introduces additional scattering and radiation loss. The presence of residual HSQ and non-ideal waveguide cross-section can compromise the integrity of the photonic structures.

    Broadband dispersion-engineered Bragg grating mirrors for integrated side-coupled Fabry–Pérot resonators · 2026 · DOI

  • Further optimization of the cavity and grating geometry to improve performance. Investigation of the potential applications in high-data-rate optical communications. Development of new materials and technologies to improve the quality and stability of the resonators.

    Broadband dispersion-engineered Bragg grating mirrors for integrated side-coupled Fabry–Pérot resonators · 2026 · DOI

  • The escalating complexity of modern data systems necessitates advancements in compact, high-speed, and energy-efficient information processing technologies. Current silicon photonics-based optical interconnects have limitations in terms of insertion loss and extinction ratio.

    Modeling of optical modulator based on silicon by using germanium antimony telluride (GST) nanolayer in elliptical cylindrical waveguide structure · 2026 · DOI

  • The longstanding stability limitations of tapered-fiber coupling have been a barrier to deploying SNAP resonators in real compact devices. The need for a sufficiently large refractive index to reach the mode effective index is a limitation. The work does not address all potential limitations of SNAP devices.

    Prism coupling and visualization of surface nanoscale axial photonic structures · 2026 · DOI

  • Further development of the prism coupler technology. Exploration of potential applications of SNAP devices in various fields. Investigation of the limitations and challenges of SNAP devices.

    Prism coupling and visualization of surface nanoscale axial photonic structures · 2026 · DOI

  • Cavities can occupy the vast majority of the device footprint, complicating fine phase control and restricting active tuning capabilities. Ring resonators are not suitable for applications requiring large free spectral ranges.

    Grating based interferometric devices on a silicon photonic platform · 2026 · DOI

Most-cited papers in Photonic and Optical Devices

Most recent work

Find a gap in your own Photonic and Optical Devices sub-topic

This page shows what the Photonic and Optical Devices literature already flags as unresolved. To narrow it to your specific question, run the guided finder — it searches the gap library on demand and checks candidates against 250M+ OpenAlex works.

Open the Research Gap Finder →

Related topics in Engineering

Human auditory perception and evaluation
606 open questions
Urban Design and Spatial Analysis
456 open questions
Spatial Cognition and Navigation
386 open questions
Traffic and Road Safety
358 open questions
Engineering Education and Curriculum Development
250 open questions
Concrete and Cement Materials Research
226 open questions
Smart Cities and Technologies
223 open questions
Advanced Sensor and Energy Harvesting Materials
220 open questions
70 open questions have been extracted from the limitations and future-work passages of 239 Photonic and Optical Devices papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

Tools for your next paper

Gaps & Literature SearchFind open questions in any field — 120,000+ open gaps mined from our own library.Pre-CheckIs your paper ready? A Tier 1–5 acceptance probability in seconds.Journal FinderA ranked shortlist of target journals from a 17,500-venue index.Duplicate Publication CheckerCheck prior-publication & salami-slicing risk across 8 sources.Citation GeneratorFreeA DOI or title → APA, MLA, Vancouver, Chicago, BibTeX, RIS. No signup.Graphical Abstract MakerFreeTurn your findings into a colorblind-safe graphical abstract.

Compare the category — Honest roundups of the AI research tools, ours listed alongside the alternatives.

Command palette

Jump anywhere, run any action.