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  • Optica Publishing Group  (105)
  • 2020-2024  (105)
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  • Optica Publishing Group  (105)
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  • 2020-2024  (105)
Year
  • 1
    Online Resource
    Online Resource
    Short dual-core GaAs photonic crystal fiber splitter with a broad bandwidth and ultrahigh extinction ratio
    Optica Publishing Group ; 2023
    In:  Applied Optics Vol. 62, No. 9 ( 2023-03-20), p. 2237-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 62, No. 9 ( 2023-03-20), p. 2237-
    Abstract: Microstructured polarization beam splitters (PBSs) have attracted much interest in recent years. Here, a ring double-core photonic crystal fiber (PCB) PSB (PCB-PSB) with an ultrashort, broadband, and high extinction ratio (ER) was designed. The effects of the structural parameters on the properties were analyzed by the finite element method, which revealed that the optimal length of the PSB was 19.08877 µm and the ER was −324.257dB. The operating bandwidth for an ER of less than −20dB is 440 nm, and the wavelength range spans the full E+S+C+L+U band between 1,320 and 1,760 nm. The fault and manufacturing tolerance of the PBS was demonstrated for structural errors of ±1%. Moreover, the influence of temperature on the performance of the PBS was determined and discussed. Our results show that a PBS has excellent potential in optical fiber sensing and optical fiber communications.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.483504
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 207387-0
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  • 2
    Online Resource
    Online Resource
    HE 1,1 mode excited surface plasmon resonance for high-sensitivity sensing by photonic crystal fibers
    Optica Publishing Group ; 2023
    In:  Journal of the Optical Society of America A Vol. 40, No. 1 ( 2023-01-01), p. 35-
    Details
    In: Journal of the Optical Society of America A, Optica Publishing Group, Vol. 40, No. 1 ( 2023-01-01), p. 35-
    Abstract: Surface plasmon resonance (SPR) is widely used in photonic crystal fiber sensors. In this work, a photonic crystal fiber sensor based on H E 1 , 1 mode excited SPR is designed and analyzed by the finite element method. The maximum wavelength sensitivity, optimal resolution, and amplitude sensitivity of the optical fiber sensor are 24,600 nm/RIU, 4.07 × 10 − 6 R I U , and 1164.13 R I U − 1 , respectively, for the refractive index range between 1.29 and 1.39. The sensor has excellent properties and wide application prospects in bimolecular and biochemical sensing, environmental monitoring, food safety, and other fields.
    Type of Medium: Online Resource
    ISSN: 1084-7529 , 1520-8532
    URL: Article
    DOI: 10.1364/JOSAA.474692
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    SSG: 24,1
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Double-ring-disk hybrid nanostructures with slits for electric field enhancement
    Optica Publishing Group ; 2023
    In:  Applied Optics Vol. 62, No. 17 ( 2023-06-10), p. 4635-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 62, No. 17 ( 2023-06-10), p. 4635-
    Abstract: Although noble metal nanoantennas have distinctive optical properties and local electric field enhancement, considerable non-radiative ohmic losses occur at the optical frequencies, consequently creating significant absorption and unwanted heating. Combining the plasmon mode of metal nanoantennas with the anapole mode of high refractive index dielectric materials offers a promising alternative to increase the electric field strength with minimal loss. Herein, a silicon disk with slots and two Au rings with a coupling mechanism are described. To elucidate the field enhancement mechanism, the near-field enhancement features and near-field electric field distributions are explored by a numerical simulation and multipole decomposition analysis. By opening the slit to generate high-intensity hot spots inside the disk, the electric field can be enhanced significantly, and nearby molecules can directly contact these hot spots. The resulting large field enhancement suggests significant applications to strong photon-exciton coupling and nonlinear photonics.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.489456
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 207387-0
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Improved optical camera communication systems using a freeform lens
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 21 ( 2021-10-11), p. 34066-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 21 ( 2021-10-11), p. 34066-
    Abstract: Optical camera communication (OCC) systems, which utilize image sensors embedded in commercial-off-the-shelf devices to detect time and spatial variations in light intensity for enabling data communications, have stirred up researchers’ interest. Compared to a direct OCC system whose maximum data rate is strongly determined by the LED source size, a reflected OCC system can break that limitation since the camera captures the light rays reflecting off an observation plane (e.g., a wall) instead of those light rays directly emanated from the light source. However, the low signal-to-noise ratio caused by the non-uniform irradiance distribution produced by LED luminaire on the observation plane in current reflected OCC systems cannot be avoided, hence low complexity and accurate demodulation are hard to achieve. In this paper, we present a FreeOCC system, which employs a dedicatedly tailored freeform lens to precisely control the propagation of modulated light. A desired uniform rectangular illumination is produced on the observation plane by the freeform lens, yielding a uniform grayscale distribution within the received frame captured by the camera in the proposed FreeOCC system. Then, the received signal can be easily demodulated with high accuracy by a simple thresholding scheme. A prototype of the FreeOCC system demonstrates the high performance of the proposed system, and two pulse amplitude modulation schemes (4-order and 8-order) are performed. By using the freeform lens, the packet reception rate is increased by 35% and 32%, respectively; the bit error rate is decreased by 72% and 59%, respectively, at a transmission frequency of 5 kHz. The results clearly show that the FreeOCC system outperforms the common reflected OCC system.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.440342
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 1491859-6
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  • 5
    Online Resource
    Online Resource
    High-performance imaging with an advanced non-imaging lens based on full-path optical diffraction calculation in two-dimensional space
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 7 ( 2022-03-28), p. 11014-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 7 ( 2022-03-28), p. 11014-
    Abstract: High-performance image-forming systems often require high system complexity due to the overdetermined nature of optical aberration correction. What we present here is a novel computational imaging modality which can achieve high-performance imaging using a simple non-image-forming optical system. The presented optical system contains an aspherical non-imaging lens which is designed with the optimal transfer of light radiation between an object and a detector. All spatial frequencies of the object collected by the non-imaging lens are delivered to the detector. No image is formed on the detector, and a full-path optical diffraction calculation method is developed to recover a high-quality image of the object from multiple intensity measurements. The effectiveness and high performance of the proposed imaging modality is verified by the examples.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.449685
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 6
    Online Resource
    Online Resource
    Surface plasmon resonance chemical sensor composed of a microstructured optical fiber for the detection of an ultra-wide refractive index range and gas-liquid pollutants
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 25 ( 2021-12-06), p. 40734-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 25 ( 2021-12-06), p. 40734-
    Abstract: A surface plasmon resonance (SPR) chemical sensor comprising microstructured optical fiber (MOF) is designed for refractive index (RI) sensing in the visible to near-infrared (0.42-1.60 µm) region (NIR) as well as detection of gas-liquid pollutants. To realize mode coupling and facilitate manufacturing, gold with inert and plasmonic properties and an analyte sensing layer are introduced to the external surface of the MOF. The sensor is analyzed by the full-vector finite element method (FEM) and the wavelength and amplitude interrogation methods are adopted to evaluate the sensing characteristics. Our analysis reveals a maximum wavelength sensitivity (WS) of 15,000 nm/RIU, amplitude sensitivity (AS) of 1,603.37 RIU -1 , and resolution (R) of 6.67×10 −6 RIU in the determination of analyte RIs spanning an ultra-wide range between 1.00 and 1.45. Furthermore, the figure of merit (FOM) and signal-to-noise ratio (SNR) of the sensor are 295.01 RIU −1 and 2.95, respectively. On account of its simple structure, low cost, and industrial compatibility, this multi-functional sensor has tremendous potential in the chemical industry, environmental monitoring, and safety control such as harmful gas monitoring, industrial wastewater and domestic sewage detection.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.444323
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 1491859-6
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Effects of different cladding materials on orbital angular momentum modes propagating in photonic crystal fibers
    Optica Publishing Group ; 2023
    In:  Journal of the Optical Society of America A Vol. 40, No. 8 ( 2023-08-01), p. 1527-
    Details
    In: Journal of the Optical Society of America A, Optica Publishing Group, Vol. 40, No. 8 ( 2023-08-01), p. 1527-
    Abstract: With the development of orbital angular momentum (OAM) photonic crystal fibers (PCFs) for more efficient communication, fiber claddings are important to the performance. In this paper, the influence of SiO 2 and four new optical materials, which are amethyst, SSK2, SF11, and LaSF09, as cladding materials, on the OAM mode characteristics is studied based on a common PCF for OAM transmission. In addition, the effective index difference, dispersion, confinement loss, and other properties of OAM modes transmitted in the five materials are derived by the finite element method. After in-depth analysis, universal rules can be obtained as guidelines for optimization of PCF in the future for improving the efficiency of optical fiber communication. Through chart analysis, it can be concluded that when materials of high effective refractive indices are used as cladding materials for PCF, the dispersion, nonlinear coefficient, confinement loss, mode purity, and other properties are significantly improved. Lower dispersion and confinement loss are more conducive to long-distance communication transmission. The decrease in nonlinear coefficient represents a better effect in suppressing nonlinear effects, and the increase in numerical aperture and mode purity respectively improves the transmission efficiency and stability of OAM communication. These conclusions provide universal rules for high-quality communication in the future.
    Type of Medium: Online Resource
    ISSN: 1084-7529 , 1520-8532
    URL: Article
    DOI: 10.1364/JOSAA.492898
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    SSG: 24,1
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  • 8
    Online Resource
    Online Resource
    Wide-spectrum laser beam shaping for full-color volume holographic optical element recording
    Optica Publishing Group ; 2023
    In:  Applied Optics Vol. 62, No. 10 ( 2023-04-01), p. 2691-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 62, No. 10 ( 2023-04-01), p. 2691-
    Abstract: For homogeneous diffraction efficiency of the recorded volume holographic optical element (vHOE), a recording beam of uniform intensity is required. A multicolor vHOE is recorded by an RGB laser source with Gaussian intensity distribution; during equal exposure time, recording beams of different intensities would result in different diffraction efficiencies in different recording areas. In this paper, we present a wide-spectrum laser beam shaping system design method, by which the incident RGB laser beam can be controlled into uniform intensity distribution with a spherical wavefront. This beam shaping system can be added to any recording system to obtain uniform intensity distribution without altering the beam shaping effect of the original recording system. The proposed beam shaping system is composed of two aspherical lens groups, and the design method with an initial point design and optimization design method is given. An example is built to demonstrate the feasibility of the proposed beam shaping system.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.484768
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 207387-0
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  • 9
    Online Resource
    Online Resource
    Nonreciprocal coupling modulated difference-sideband generation in a double-cavity optomechanical system
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 21 ( 2023-10-09), p. 34560-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 21 ( 2023-10-09), p. 34560-
    Abstract: We theoretically study the difference-sideband generation in a double-cavity optomechanical system with nonreciprocal coupling. Beyond the conventional linearized description of optomechanical interactions, we derive analytical expressions for the efficiency of difference-sideband generation by using a perturbation method. Here we investigate bistable behaviors of the system and show the difference-sideband generation modulated by the nonreciprocal coupling strength between the two cavities. We find that the nonreciprocal coupling strength can not only affect the bistability of the system but also lead to different efficiencies of difference-sideband generation at low power. To achieve high efficiency of difference-sideband generation, we give the optimal matching conditions under different parameter mechanisms. Especially as the power increases, we find new matching conditions with remarkable difference-sideband generation emerging, which is attribute to the strong coherence between the cavity field and the mechanical oscillator. Furthermore, a feasible scheme to obtain difference-sideband generation by employing multiple adjustable variables is proposed. Our results may find applications in nonreciprocal optical frequency combs and communications, and provide a potential method for precision measurements and on-chip manipulation of light transmission.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.501336
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 1491859-6
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  • 10
    Online Resource
    Online Resource
    Active polarization controller based on micro-ring resonators
    Optica Publishing Group ; 2023
    In:  Optics Letters
    Details
    In: Optics Letters, Optica Publishing Group
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.502896
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 243290-0
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