Microring resonators, due to their ability enable robust strong light–matter interactions within structures, have garnered substantial interest for utility in sensing applications, particularly the realm of gas detection. However, there is an inherent trade-off between a microring resonator's quality factor and confinement air, making it difficult balance them. Here, we demonstrate novel solution with suspended nanomembrane silicon (SNS) resonator. This resonator has ultrathin sub-wavelength...

Abstract Hyperuniform disordered solids (HUDS) waveguides, a type of emerging artificial photonic bandgap (PBG) devices, are demonstrated to possess large, complete, and isotropic PBGs, being promising for developing applications in optoelectronics, nonlinear optics, sensing. However, optical losses HUDS waveguides usually limited by giant light scattering from the irregular distribution cells. Herein, waveguide devices with low large PBGs exploring morphology‐engineering...

Theoretical and experimental studies of mid-infrared (mid-IR) suspended membrane waveguide (SMW) ring (SMR) resonator are presented. An array periodical holes beside the rib facilitates local removal buried oxide to form devices on silicon-on-insulator (SOI). The design is optimized in terms hole size, etch depth, bend radius minimize device strain optical loss. We calculate dimension attain wide low-dispersion ( <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A fast-response photodetector is developed, which highly photoresponsive and works over a broadband. It fabricated using combination of chemical vapor deposition graphene silicon, together with the utilization lateral photoconductor operating mode. The exhibits high responsivities ≈1.0 × 104 ≈0.23 W−1 in visible (632 nm) infrared regions (1550 nm), respectively. response time both below 3 μs spectral regions. As service to our authors readers, this journal provides supporting information...

Abstract Surface-enhanced Raman spectroscopy (SERS) is a powerful tool for vibrational as it provides several orders of magnitude higher sensitivity than inherently weak spontaneous scattering by exciting localized surface plasmon resonance (LSPR) on metal substrates. However, SERS can be unreliable biomedical use since sacrifices reproducibility, uniformity, biocompatibility, and durability due to its strong dependence “hot spots”, large photothermal heat generation, easy oxidization. Here,...

Breathtaking innovations in optical imaging have opened new exciting avenues for science, industry, and medicine over the last few decades. One of such is time-stretch imaging—an emerging method ultrafast that builds on temporally stretching broadband pulses by using dispersive properties light both spatial temporal domains. It achieves continuous image acquisition at an ultrahigh frame rate 10–1000 million frames per second overcoming technical fundamental limitations exist traditional...

We present a graphene-on-silicon (GoS) suspended vertical slot waveguide. By changing the Fermi level of graphene, variation in effective refractive index (RI) waveguide is factor two larger than that traditional GoS rib The improvement due to light-intensity enhancement and poor confinement optical mode nanostructure. design Mach-Zehnder interferometer (MZI) microring modulators based on Our calculations show can be energy-efficient footprint-compact large phase shift propagating after...

We demonstrated strong optical absorption in a graphene integrated silicon slot waveguide. Due to the increase light intensity and decrease of mode confinement slot, experienced an increased interaction in-plane light. A waveguide 0.935 dB μm−1 was measured at 1.55 μm wavelengths. Based on graphene-on-silicon waveguide, compact high-responsivity photodetector demonstrated. Benefited from lack efficient electron cooling suspended enhancement effect nano maximum responsivity 0.273 W−1 achieved...

Compact and smart optical gas sensors have attracted significant attention over the past few decades. Among materials used for developing such sensors, group-IV materials, including silicon, germanium, carbon allotropes, their compounds, are considered most promising candidates. By virtue of inherent compatibility with CMOS fabrication process in mature microelectronics industry, on-chip based on merits appreciable sensitivity high-density integration. Moreover, potential to be integrated...

Silicon photonic devices used in the photonics industry over past three decades have helped realizing large-scale integrated circuits. nitride (Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> ) is another CMOS-compatible platform that provides several advantages such as low loss, high optical power tolerance, and broad spectral operation band from visible to infrared wavelengths....

Short-wavelength mid-infrared (2–2.5 μm wave band) silicon photonics has been a growing area to boost the applications of integrated optoelectronics in free-space optical communications, laser ranging, and biochemical sensing. In this spectral region, multi-project wafer foundry services developed for telecommunication band are easily adaptable with low intrinsic absorption from dioxide materials. However, light coupling techniques at 2–2.5 wavelengths, namely, grating couplers, still suffer...

Abstract Hyperuniform disordered solid (HUDS) structures can provide large, uniform, complete, and isotropic light confinement at the nanoscale after precise design. Based on HUDS structures, in‐plane for developing photonic integrated circuits is also explored. To improve performance of devices, researchers have mainly focused cell size or distribution optimization in HUDS, which suffers from time‐consuming computation moderate bandgap (PBG) modification. Here, a morphology engineering...

We demonstrate giant mid-infrared light absorption of a PtSe 2 -on-silicon waveguide by integrating film on an ultra-thin silicon waveguide, opening avenue to developing high-performance optoelectronic integrated circuits.

A mid-infrared (mid-IR)-focusing subwavelength grating (SWG) coupler and suspended membrane waveguide (SMW) on a silicon-on-insulator wafer are studied. For transverse-electric mode uniform SWG, finite-difference time-domain simulation predicts 44.2% coupling efficiency with 1 dB bandwidth of about 220 nm backreflection 0.78% at 2.75 μm. Then the SWG is curved to focusing using phase-matching formula. The SMWs analyzed by finite element method fabricated. An Er3+–Pr3+ co-doped mid-IR fiber...

We propose and experimentally demonstrate a novel subwavelength grating coupler on silicon-on-insulator, for coupling to optical fibers with wide bandwidth. Theoretical analysis design optimization of the are described. About 73 nm 1 dB bandwidth was demonstrated −5.6 efficiency. Better than −3.4 efficiency 86 is predicted these structures optimized buried oxide thickness.

We present an air-cladding apodized focusing subwavelength grating that can effectively couple two polarizations into a single waveguide. For the transverse magnetic mode, −3.2 dB maximum coupling efficiency with ∼28 nm 1 bandwidth is achieved. With same grating, −4.3 ∼58 achieved for electric mode. The minimum difference between polarizations' peaks demonstrated to be ∼32 nm. At 1525 wavelength range, polarization-insensitive −6.5 efficiency. controlled experimentally.

We present a focusing subwavelength grating (SWG) for efficient coupling of mid-infrared (mid-IR) light into suspended membrane Ge photonic integrated circuits (PICs) that enable mid-IR applications in the entire fingerprint region. By virtue their wide spectral transparency window and air-cladding device configuration, PICs are expected to be effective over region covering from 2 15 μm. Specifically, we demonstrate maximum efficiency -11 dB with 1-dB bandwidth ∼58 nm at SWG's center...

We experimentally study the in-plane optical absorption and free carrier (FCA) in graphene-on-silicon waveguides using a pump-probe measurement over microsecond timescales. The silicon waveguide is fabricated complementary metal-oxide-semiconductor compatible processes, directly covered by graphene layer. Saturable observed at beginning of pump pulse followed an increase absorption. builds up several microseconds, experimental evidence that carriers generated can transfer into waveguides....

Plasmon-induced hot-electron generation has recently received considerable interest and been studied to develop novel applications in optoelectronics, photovoltaics green chemistry. Such hot electrons are typically generated from either localized plasmons metal nanoparticles or propagating patterned nanostructures. Here we simultaneously generate these heterogeneous plasmon-induced exploit their cooperative interplay a single metal-semiconductor device demonstrate, as an example,...

Based on measuring the polarimetric parameters which contain specific physical information, imaging has been widely applied to various fields. However, in practice, noise during image acquisition could lead output of noisy images. In this paper, we propose, for first time our knowledge, a learning-based method denoising. This is based residual dense network and can significantly suppress The experimental results show that proposed an evident performance suppression outperforms other existing...

Abstract Raman optical activity (ROA) is effective for studying the conformational structure and behavior of chiral molecules in aqueous solutions advantageous over X-ray crystallography nuclear magnetic resonance spectroscopy sample preparation cost performance. However, ROA signals are inherently minuscule; 3–5 orders magnitude weaker than spontaneous scattering due to weak light–matter interaction. Localized surface plasmon on metallic nanoparticles has been employed enhance signals, but...

Reduced resolution of polarized images makes it difficult to distinguish detailed polarization information and limits the ability identify small targets weak signals. A possible way handle this problem is super-resolution (SR), which aims obtain a high-resolution image from low-resolution one. However, compared with traditional intensity-mode SR, SR more challenging because channels their nonlinear cross-links need be considered as well intensity reconstructed simultaneously. This paper...