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  • Optica Publishing Group  (6)
  • 2020-2024  (6)
  • 1
    Online Resource
    Online Resource
    Design and fabrication of a downlight luminaire with a dual frusto-conical reflector
    Optica Publishing Group ; 2021
    In:  Applied Optics Vol. 60, No. 25 ( 2021-09-01), p. 7775-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 60, No. 25 ( 2021-09-01), p. 7775-
    Abstract: A design method and corresponding fabrication procedures are proposed for a dual frusto-conical reflector of a downlight luminaire. The profile of the dual frusto-conical reflector consists of two flat-slant reflective surfaces with slightly different slopes. The optimum dual frusto-conical reflector can be obtained with the proposed design method. The finished product of the dual frusto-conical reflector is fabricated by a 3D printer and followed by surface polishing and reflection paint spraying. The measurement results show that luminaires exhibited 70% optimum illuminance confined within an illumination area of 1.8 m 2 , and the optimum illumination intensity is at 252 lux. The optimum efficiency of the proposed luminaire can reach 158 lm/W for normal-white light-emitting diode (LED) and 119 lm/W for warm-white LED, respectively.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.431327
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 207387-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Biological cell trapping and manipulation of a photonic nanojet by a specific microcone-shaped optical fiber tip
    Optica Publishing Group ; 2023
    In:  Optics Letters Vol. 48, No. 5 ( 2023-03-01), p. 1216-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 48, No. 5 ( 2023-03-01), p. 1216-
    Abstract: Trapping and manipulating mesoscopic biological cells with high precision and flexibility are very important for numerous biomedical applications. In particular, a photonic nanojet based on a non-resonance focusing phenomenon can serve as a powerful tool for manipulating red blood cells and tumor cells in blood. In this study, we demonstrate an approach to trap and drive cells using a high-quality photonic nanojet which is produced by a specific microcone-shaped optical-fiber tip. The dynamic chemical etching method is used to fabricate optical-fiber probes with a microcone-shaped tip. Optical forces and potentials exerted on a red blood cell by a microcone-shaped fiber tips are analyzed based on finite-difference time-domain calculations. Optical trapping and driving experiments are done using breast cancer cells and red blood cells. Furthermore, a cell chain is formed by adjusting the magnitude of the optical force. The real-time backscattering intensities of multiple cells are detected, and highly sensitive trapping is achieved. This microcone-shaped optical fiber probe is potentially a powerful device for dynamic cell assembly, optical sorting, and the precise diagnosis of vascular diseases.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.484849
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 243290-0
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  • 3
    Online Resource
    Online Resource
    Using angle-selective optical film to enhance the light extraction of a thin-film encapsulated 3D reflective pixel for OLED displays
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 26 ( 2022-12-19), p. 46435-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 26 ( 2022-12-19), p. 46435-
    Abstract: Light extraction improvement is still an important issue for active-matrix organic light-emitting diode displays (AMOLEDs). In our previous work, a three-dimensional (3D) reflective pixel configuration embedding the OLED in the concave 3D reflector and patterned high-index filler had been proposed for significant enhancement of the pixel light extraction. In this work, influences of thin film encapsulation (TFE) on light extraction of such reflective 3D OLED pixels are considered as well by simulation studies. Unfortunately, the optical simulation reveals strong reduction of the light extraction efficiency induced by TFE layers. As such, an additional angle-selective optical film structure between the pixel and the encapsulation layers is introduced to control the angular distribution of the light coupled into the encapsulation layers and to solve TFE-induced optical losses. As a result, TFE-induced losses can be substantially reduced to retain much of light extraction efficiency. The results of this study are believed to provide useful insights and guides for developing even more efficient and power-saving AMOLEDs.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.477797
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 4
    Online Resource
    Online Resource
    Mid-infrared resonant light emission from GeSn resonant-cavity surface-emitting LEDs with a lateral p-i-n structure
    Optica Publishing Group ; 2022
    In:  Photonics Research Vol. 10, No. 10 ( 2022-10-01), p. 2278-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 10, No. 10 ( 2022-10-01), p. 2278-
    Abstract: We demonstrate room-temperature, mid-infrared resonant electroluminescence from GeSn resonant-cavity LEDs with a lateral p-i-n configuration on a silicon-on-insulator substrate. A vertical cavity to enhance light emission in the GeSn active layer is formed by the low-index buried oxide and deposited SiO 2 layer. A planar lateral p-i-n diode structure favorable for CMOS-compatible, dense integration was designed and fabricated for current injection. Under continuous-wave electrical injection, room-temperature resonant electroluminescence was successfully observed at ∼ 1980    nm with a spectral emission factor of 2.2. These results could pave the way toward efficient electrically injected GeSn light emitters operating at room temperature.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.457193
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2724783-1
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  • 5
    Online Resource
    Online Resource
    Broadband titanium nitride disordered metasurface absorbers
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 26 ( 2021-12-20), p. 42813-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 26 ( 2021-12-20), p. 42813-
    Abstract: We experimentally demonstrate titanium nitride (TiN) broadband metasurface perfect absorbers by conformally coating plasmonic TiN films onto disordered anodic aluminum oxide (AAO) nanotemplates. The disordered metasurface absorbers exhibit polarization-insensitive and weak angle-dependent perfect absorption over the entire visible and near-infrared spectral regions (300  〈   λ 〈 2500 nm). We show from experimental results and numerical simulations that the light scattering induced by the strong disorder of the AAO nanopores and the strong absorption of the TiN deposited on their sidewall are of critical importance for achieving broadband perfect absorption. The TiN disordered metasurface perfect absorbers are superior to many other types of broadband perfect absorbers previously reported and are more suitable for practical applications especially in harsh environments. The device concept for broadband perfect absorption based on plasmonic metal-nitride film coated disordered dielectric media could potentially be extended to significantly enhance the efficiency of solar energy harvesting and the performance of hot-carrier based optoelectronics.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.445247
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 1491859-6
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  • 6
    Online Resource
    Online Resource
    Diode-pumped 1-µm Nd:YVO 4 and Nd:YLF lasers with active thermal lensing compensation and manipulated beam quality
    Optica Publishing Group ; 2022
    In:  Optics Continuum Vol. 1, No. 5 ( 2022-05-15), p. 1137-
    Details
    In: Optics Continuum, Optica Publishing Group, Vol. 1, No. 5 ( 2022-05-15), p. 1137-
    Abstract: Thermally induced optical adaptive lens in a solid-state laser can be used to compensate for the thermal lens and improve the beam quality. Herein, we present an active compensation method for thermal lensing in 1 µm diode-pumped solid-state Nd:YVO 4 and Nd:YLF lasers. The compensation scheme comprised thermally inducing the defocusing effect of π polarization in Nd:YLF; the defocusing strength was controlled using a diode pump power. By varying the absorbed ∼790 nm diode power of Nd:YLF (0 to 7.8 W), the beam quality, M 2 , of Nd:YVO 4 was manipulated from 2.4 to ∼1.1 and the power fluctuation was measured to be less than 0.5%.
    Type of Medium: Online Resource
    ISSN: 2770-0208
    URL: Article
    DOI: 10.1364/OPTCON.456014
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 3143831-3
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