scholarly journals Entangled photons from on-chip slow light

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Hiroki Takesue ◽  
Nobuyuki Matsuda ◽  
Eiichi Kuramochi ◽  
Masaya Notomi
Keyword(s):  
Slow Light ◽  
Entangled Photons ◽  
On Chip

scholarly journals Double-layer graphene on photonic crystal waveguide electro-absorption modulator with 12 GHz bandwidth

Nanophotonics ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 2377-2385 ◽  
Author(s):  
Zhao Cheng ◽  
Xiaolong Zhu ◽  
Michael Galili ◽  
Lars Hagedorn Frandsen ◽  
Hao Hu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Double Layer ◽  
Slow Light ◽  
Modulation Depth ◽  
Photonic Crystal Waveguide ◽  
Optical Modulators ◽  
Layer Graphene ◽  
Silicon Photonic ◽  
On Chip ◽  
Silicon Based

AbstractGraphene has been widely used in silicon-based optical modulators for its ultra-broadband light absorption and ultrafast optoelectronic response. By incorporating graphene and slow-light silicon photonic crystal waveguide (PhCW), here we propose and experimentally demonstrate a unique double-layer graphene electro-absorption modulator in telecommunication applications. The modulator exhibits a modulation depth of 0.5 dB/μm with a bandwidth of 13.6 GHz, while graphene coverage length is only 1.2 μm in simulations. We also fabricated the graphene modulator on silicon platform, and the device achieved a modulation bandwidth at 12 GHz. The proposed graphene-PhCW modulator may have potentials in the applications of on-chip interconnections.

scholarly journals Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1808
Author(s):  
Liqiang Zhuo ◽  
Huiru He ◽  
Ruimin Huang ◽  
Shaojian Su ◽  
Zhili Lin ◽  
...  
Keyword(s):  
Group Velocity ◽  
Light Field ◽  
Slow Light ◽  
Dielectric Materials ◽  
Degree Of Freedom ◽  
Geometrical Parameters ◽  
Edge States ◽  
Velocity Modulation ◽  
Plasmonic Metamaterials ◽  
On Chip

The valley degree of freedom, like the spin degree of freedom in spintronics, is regarded as a new information carrier, promoting the emerging valley photonics. Although there exist topologically protected valley edge states which are immune to optical backscattering caused by defects and sharp edges at the inverse valley Hall phase interfaces composed of ordinary optical dielectric materials, the dispersion and the frequency range of the edge states cannot be tuned once the geometrical parameters of the materials are determined. In this paper, we propose a chirped valley graphene plasmonic metamaterial waveguide composed of the valley graphene plasmonic metamaterials (VGPMs) with regularly varying chemical potentials while keeping the geometrical parameters constant. Due to the excellent tunability of graphene, the proposed waveguide supports group velocity modulation and zero group velocity of the edge states, where the light field of different frequencies focuses at different specific locations. The proposed structures may find significant applications in the fields of slow light, micro–nano-optics, topological plasmonics, and on-chip light manipulation.

scholarly journals Towards lab-on-chip ultrasensitive ethanol detection using photonic crystal waveguide operating in the mid infrared

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Rostamian ◽  
Ehsan Madadi-Kandjani ◽  
Hamed Dalir ◽  
Volker J. Sorger ◽  
Ray T. Chen
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
High Sensitivity ◽  
Guided Wave ◽  
Silicon On Insulator ◽  
Group Index ◽  
Photonic Crystal Waveguide ◽  
Mid Infrared ◽  
Lab On Chip ◽  
On Chip

Abstract Thanks to the unique molecular fingerprints in the mid-infrared spectral region, absorption spectroscopy in this regime has attracted widespread attention in recent years. Contrary to commercially available infrared spectrometers, which are limited by being bulky and cost-intensive, laboratory-on-chip infrared spectrometers can offer sensor advancements including raw sensing performance in addition to use such as enhanced portability. Several platforms have been proposed in the past for on-chip ethanol detection. However, selective sensing with high sensitivity at room temperature has remained a challenge. Here, we experimentally demonstrate an on-chip ethyl alcohol sensor based on a holey photonic crystal waveguide on silicon on insulator-based photonics sensing platform offering an enhanced photoabsorption thus improving sensitivity. This is achieved by designing and engineering an optical slow-light mode with a high group-index of n g  = 73 and a strong localization of modal power in analyte, enabled by the photonic crystal waveguide structure. This approach includes a codesign paradigm that uniquely features an increased effective path length traversed by the guided wave through the to-be-sensed gas analyte. This PIC-based lab-on-chip sensor is exemplary, spectrally designed to operate at the center wavelength of 3.4 μm to match the peak absorbance for ethanol. However, the slow-light enhancement concept is universal offering to cover a wide design-window and spectral ranges towards sensing a plurality of gas species. Using the holey photonic crystal waveguide, we demonstrate the capability of achieving parts per billion levels of gas detection precision. High sensitivity combined with tailorable spectral range along with a compact form-factor enables a new class of portable photonic sensor platforms when combined with integrated with quantum cascade laser and detectors.

Coherent quantum control of on-chip time-frequency entangled photons

2017 ◽  
Author(s):  
Poolad Imany ◽  
Ogaga D. Odele ◽  
Jose A. Jaramillo-Villegas ◽  
Minghao Qi ◽  
Daniel E. Leaird ◽  
...  
Keyword(s):  
Quantum Control ◽  
Entangled Photons ◽  
Time Frequency ◽  
On Chip ◽  
Coherent Quantum

scholarly journals Two-plasmon spontaneous emission from a nonlocal epsilon-near-zero material

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Futai Hu ◽  
Liu Li ◽  
Yuan Liu ◽  
Yuan Meng ◽  
Mali Gong ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Slow Light ◽  
Photon Emission ◽  
Large Field ◽  
Semiconductor Film ◽  
Light Sources ◽  
Plasmonic Material ◽  
Optical Applications ◽  
On Chip ◽  
Epsilon Near Zero

AbstractPlasmonic cavities can provide deep subwavelength light confinement, opening up new avenues for enhancing the spontaneous emission process towards both classical and quantum optical applications. Conventionally, light cannot be directly emitted from the plasmonic metal itself. Here, we explore the large field confinement and slow-light effect near the epsilon-near-zero (ENZ) frequency of the light-emitting material itself, to greatly enhance the “forbidden” two-plasmon spontaneous emission (2PSE) process. Using degenerately-doped InSb as the plasmonic material and emitter simultaneously, we theoretically show that the 2PSE lifetime can be reduced from tens of milliseconds to several nanoseconds, comparable to the one-photon emission rate. Furthermore, we show that the optical nonlocality may largely govern the optical response of the ultrathin ENZ film. Efficient 2PSE from a doped semiconductor film may provide a pathway towards on-chip entangled light sources, with an emission wavelength and bandwidth widely tunable in the mid-infrared.

scholarly journals Ultracompact all-optical logic gates based on nonlinear plasmonic nanocavities

Nanophotonics ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 365-376 ◽  
Author(s):  
Xiaoyu Yang ◽  
Xiaoyong Hu ◽  
Hong Yang ◽  
Qihuang Gong
Keyword(s):  
Slow Light ◽  
Contrast Ratio ◽  
Logic Gates ◽  
Excitation Power ◽  
Optical Logic ◽  
All Optical ◽  
Nonlinearity Effect ◽  
Order Of Magnitude ◽  
On Chip ◽  
Induced Transparency

AbstractIn this study, nanoscale integrated all-optical XNOR, XOR, and NAND logic gates were realized based on all-optical tunable on-chip plasmon-induced transparency in plasmonic circuits. A large nonlinear enhancement was achieved with an organic composite cover layer based on the resonant excitation-enhancing nonlinearity effect, slow light effect, and field confinement effect provided by the plasmonic nanocavity mode, which ensured a low excitation power of 200 μW that is three orders of magnitude lower than the values in previous reports. A feature size below 600 nm was achieved, which is a one order of magnitude lower compared to previous reports. The contrast ratio between the output logic states “1” and “0” reached 29 dB, which is among the highest values reported to date. Our results not only provide an on-chip platform for the study of nonlinear and quantum optics but also open up the possibility for the realization of nanophotonic processing chips based on nonlinear plasmonics.

scholarly journals Plasmonic Nanosensor Based on Independently Tunable Multiple Fano Resonances

2019 ◽  
Author(s):  
Lin Cheng ◽  
Zelong Wang ◽  
Xiaodong He ◽  
Pengfei Cao
Keyword(s):  
Refractive Index ◽  
Slow Light ◽  
Optical Switches ◽  
The Finite Element Method ◽  
High Group ◽  
Practical Applications ◽  
Plasmonic Structures ◽  
Group Refractive Index ◽  
On Chip ◽  
Plasmonic Nanosensor

A novel refractive index nanosensor with compound structures is proposed in this paper. It consists of three different kinds of resonators and two stubs which are side-coupled to a metal-dielectric-metal (MDM) waveguide. By utilizing numerical investigation with the finite element method (FEM), the simulation results show that the transmission spectrum of the nanosensor has as much as five sharp peaks of Fano resonance. Due to their different resonance mechanisms, each peak of resonances can be independently tuned by adjusting the corresponding parameters of the structure. In addition, the sensitivity of the nanosensor is up to , and it also has an excellent performance with a high group refractive index of . For the sake of different functions to practical applications, a legitimate combination of various different components, such as T-shaped, ring, and split-ring cavities, has been proposed to make the nanosensor dramatically reduce its dimensions without sacrificing performance. These designing concepts pave a new way to construct such compact on-chip plasmonic structures, and it can be widely applied to nanosensors, optical splitters, filters, optical switches, nonlinear photonic and slow-light devices. 

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