Search query: circularly polarized cavity mode photonic crystal

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author_names: Yuzou Kinuta

Shun Takahashi

Kenichi Yamashita

J Tatebayashi

Satoshi Iwamoto

Yasuhiko Arakawa
title: Circularly Polarized Cavity Mode in a Semiconductor Based Chiral Photonic Crystal Fabricated by a Micro Manipulation Method using an Optical Microscope
year: 2019

abstract: We experimentally demonstrated a cavity mode in a GaAs based chiral photonic crystal having a planar defect. The three dimensional structure was fabricated by a micro manipulation technique under optical microscope observation. Photoluminescence measurement at low temperature for InAs quantum dots embedded in the photonic crystal showed a polarization bandgap for left handed circularly polarized light. In this bandgap, a cavity mode peak appeared and its cavity Q factor was about 390. This result could be applied to optoelectronics, biological or medical field as a circularly polarized light source with compact and high efficiency.
author_names: Yuzou Kinuta

Shun Takahashi

Kenichi Yamashita

J Tatebayashi

Satoshi Iwamoto

Yasuhiko Arakawa
title: Chiral Cavity Mode in a GaAs Based Three Dimensional Photonic Crystal Fabricated by a Micro Manipulation Method using an Optical Microscope
venue: 2019 Compound Semiconductor Week (CSW)
year: 2019

abstract: Excitons in two dimensional (2D) transition metal dichalcogenides (TMDC) are stable at room temperature because of high exciton binding energies. They can be selectively addressed based on the unique optical selection rules from angular momentum conservation for the $K/{K}\ensuremath{ valley state and the helicity of circularly polarized light. When coupled with the optical modes in optical cavities, excitons can form exciton polaritons, exploiting which in 2D TMDC may lead to optoelectronic devices for room temperature operation. The valley degree of freedom of the excitons, however, is mostly lost when forming exciton polaritons because the cavity mode usually does not have a well defined spin angular momentum. Here, we theoretically demonstrate that the valley information of exciton polaritons can be preserved and resolved in a photonic cavity made of birefringent materials. Because of the optical anisotropy, the guided resonance modes have a net transverse spin angular momentum and selectively couple to exciton polaritons with the corresponding valley state. In the strong coupling regime, the exciton polariton behaves in a way like the Rashba effect in the solid. The dispersion of the $K/{K}\ensuremath{ exciton polariton splits in momentum space based on its valley state, similar to electron spins in Rashba systems. Realizing valley dependent exciton polaritons affords a possibility to explore valley exciton dynamics in a strongly coupled system and will contribute to the study of excitonic, polaritonic devices, Bose Einstein condensation, and superfluidity in semiconductors.
author_names: Ruoming Peng

Changming Wu

Huan Li

Xiaodong Xu

Mo Li
title: Separation of the valley exciton polariton in two dimensional semiconductors with an anisotropic photonic crystal
year: 2020

abstract: Modulated photonic crystal lasers can control the output beam direction two dimensionally by exciting a two dimensional cavity mode at the non diffractive photonic band edge and diffracting the mode upwards with position modulation of each air hole. In these lasers, the position modulation can be introduced one directionally, where the modulation is given by the distances between the air holes, or two directionally, where the modulation is given by the rotation angles of the air holes. For one directional position modulation, we show that the polarization of output beams is perpendicular to the direction of modulation. For two directional position modulation, we show that circularly polarized beams are obtained. As such, these lasers can control not only the beam direction but also the polarization.
author_names: Kyoko Kitamura

Tsuyoshi Okino

Daiki Yasuda

Susumu Noda
title: Polarization control by modulated photonic crystal lasers.
venue: Optics letters
year: 2019

abstract: Up to now it remains challenging to couple photons from a circularly polarized emitter into a photonic structure to simultaneously realize strong photon emitter interaction and unidirectional propagation locked by local helicity of the optical mode at the nanoscale. In this paper we propose a unique approach that combines a photonic crystal and metallic nanoparticle structure to create nanocavities with both strong local field intensity and high helicity. In this system the rate of circularly polarized photons emitting into the photonic crystal waveguide reaches $148{\ensuremath{\gamma}}_{0} which is one order of magnitude larger than that without the nanoparticle, and in the ultranarrow band edge mode the linewidth of Rabi splitting spectra is about one tenth of that with the nanoparticle only, both with \ensuremath{\approx}95% of photons propagating unidirectionally along the nanoscale waveguide. We suggest that our paper establishes a nanophotonic interface of chiral quantum electrodynamics for on chip nonreciprocal quantum light sources, quantum circuits, and scalable quantum networks.
author_names: Fan Zhang

Juanjuan Ren

Lingxiao Shan

Xueke Duan

Yang Li

Tiancai Zhang

Qihuang Gong

Ying Gu
title: Chiral cavity quantum electrodynamics with coupled nanophotonic structures
year: 2019

abstract: We present the dipole induced transparency (DIT) of a diamond nitrogen vacancy center embedded in a photonic crystal cavity coupled to two waveguides, and it is obvious with the robust and flexible reflectance and transmittance difference of circularly polarized lights between the uncoupled and the coupled cavities even in the bad cavity regime (the Purcell regime) With this DIT, we propose two universal hyperparallel hybrid photonic quantum logic gates, including a hybrid hyper controlled not gate and a hybrid hyper Toffoli gate, on photon systems in both the polarization and the spatial mode degrees of freedom (DOFs) which are equal to two identical quantum logic gates operating simultaneously on the systems in one DOF. They can be used to perform more quantum operations with less resources in the quantum information protocols with multiqubit systems in several DOFs, which may depress the resources consumed and the photonic dissipation. Moreover, they are more robust against asymmetric environment noise in the weak coupling regime, compared with the integration of two cascaded quantum logic gates in one DOF.
author_names: Bao-Cang Ren

Guan-Yu Wang

Fu-Guo Deng
title: Universal hyperparallel hybrid photonic quantum gates with dipole induced transparency in the weak coupling regime
year: 2015

abstract: Abstract In this paper, the coreless photonic crystal fiber (CO PCF) is investigated using finite element. The absence of core in the PCF structure is achieved by applying the permanent twist on its cladding boundary and hence the light propagation path tends to be circularly polarized. The other modes can also be exerted other than the fundamental modes is known as cladding filled modes or super modes.
author_names: Teppala Venkata Ramana

Arun Pandian

C Ellammal

T Jarin

Ahmed Nabih Zaki Rashed

A Sampathkumar
title: Numerical analysis of circularly polarized modes in coreless photonic crystal fiber
venue: Results in Physics
year: 2019

abstract: We compare the properties of the broadband supercontinuum (SC) generated in twisted and untwisted solid core photonic crystal fibers when pumped by circularly polarized 40 picosecond laser pulses at 1064 nm. In the helically twisted fiber, fabricated by spinning the preform during the draw, the SC is robustly circularly polarized across its entire spectrum whereas, in the straight fiber, axial fluctuations in linear birefringence and polarization dependent nonlinear effects cause the polarization state to vary randomly with the wavelength. Theoretical modelling confirms the experimental results. Helically twisted photonic crystal fibers permit the generation of pure circularly polarized SC light with excellent polarization stability against fluctuations in input power and environmental perturbations.
author_names: Rafal Sopalla

Gordon K L Wong

Nicolas Y Joly

Michael H Frosz

Xin Jiang

Goran Ahmed

Philip St J Russell
title: Generation of broadband circularly polarized supercontinuum light in twisted photonic crystal fibers.
venue: Optics letters
year: 2019

abstract: We propose and investigate an ultra compact air mode photonic crystal nanobeam cavity (PCNC) with an ultra high quality factor to mode volume ratio (Q/V) by quadratically tapering the lattice space of the rectangular holes from the center to both ends while other parameters remain unchanged. By using the three dimensional finite difference time domain method, an optimized geometry yields a Q of 7.2x106 and a V~1.095(l/nSi)3 in simulations, resulting in an ultra high Q/V ratio of about 6.5x106(l/nSi) 3. When the number of holes on either side is 8, the cavity possesses a high sensitivity of 252 nm/RIU (refractive index unit) a high calculated Q factor of 1.27x105, and an ultra small effective V of ~0.758(l/nSi)3 at the fundamental resonant wavelength of 1521.74 nm. Particularly, the footprint is only about 8x0.7 mm2. However, inevitably our proposed PCNC has several higher order resonant modes in the transmission spectrum, which makes the PCNC difficult to be used for multiplexed sensing. Thus, a well designed bandstop filter with weak sidelobes and broad bandwidth based on a photonic crystal nanobeam waveguide is created to connect with the PCNC to filter out the high order modes. Therefore, the integrated structure presented in this work is promising for building ultra compact lab on chip sensor arrays with high density and parallel multiplexing capability.
author_names: Fujun Sun

Zhongyuan Fu

Chunhong Wang

Zhaoxiang Ding

Chao Wang

Huiping Tian
title: Ultra compact air mode photonic crystal nanobeam cavity integrated with bandstop filter for refractive index sensing.
venue: Applied optics
year: 2017

abstract: The properties of the guided modes, including the single mode conditions and the coupling of different polarized modes in the single crystal lithium niobate photonic wires, were analyzed in detail. One dimensional photonic crystal micro cavities with several different patterns, which could be used as an ultra compact optical filter, were designed and simulated in order to get high transmission at the resonant wavelength and the best preferment. The designed structure, with the whole size of 6.5 x 0.7 mm2, was fabricated on a single mode photonic wire. A measured peak transmission of 0.34 at 1400 nm, an extinction ratio of 12.5 dB and a Q factor of 156 were obtained. The measured transmission spectrum was basically consistent with the simulation, although a slight shift of resonant wavelength occurred due to the fabrication errors.
author_names: Lutong Cai

Shaomei Zhang

Hui Hu
title: A compact photonic crystal micro cavity on a single mode lithium niobate photonic wire
year: 2016