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  • 1.
    Kim, Hwi-Min
    et al.
    Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea..
    Jang, Hoon
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik. Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea.
    Pramudita, Putu
    Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea..
    Kim, Myung-Ki
    Korea Univ, KU KIST Grad Sch Converging Sci & Technol, Seoul 02841, South Korea..
    Lee, Yong-Hee
    Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea..
    Monolithic integration of self-aligned nanoisland laser with shifted-air-hole waveguide2018Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, nr 10, s. 12569-12578Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report a novel scheme for monolithic integration of a nanoisland laser with a shifted-air-hole waveguide by employing selective etching techniques. An active L3 laser cavity and passive shifted-air-hole waveguide are simultaneously formed through a single fabrication step. In the shifted-air-hole waveguide, the air-hole position is adjusted to be compatible with selective etching. The spectral overlap between the L3 laser resonance and guided mode is achieved by introducing small air holes at the nodes of the shifted-air-hole waveguide. Experiments show that >60% of the light is coupled from the nanoisland laser to the end of the 12-mu m-long waveguide.

  • 2. Pramudita, Putu
    et al.
    Jang, Hoon
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik. Korea Advanced Institute of Science and Technology (KAIST), South Korea.
    Karnadi, Indra
    Kim, Hwi-Min
    Lee, Yong-Hee
    Self-aligned nanoislands nanobeam bandedge lasers2017Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, nr 6, s. 6311-6319Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We propose and demonstrate a novel one-dimensional nanobeam bandedge laser constituted by self-aligned nanoisland quantum-well (QW) structures. The formation of self-aligned InGaAsP nanoislands sandwiched between two InP claddings is the result of selective removal of QW through wet-etching processes. By controlling wet-etching time, we show a good spatial and spectral overlap between the dielectric mode and the self-aligned nanoisland structures leads to the realization of nanobeam bandedge lasers with low-threshold operations and high slope efficiencies. Optical characterization results indicate a strong correlation between the size of individual nanoisland and the threshold power of our nanobeam bandedge lasers. We obtain an approximately 81% reduction in the absorbed threshold power as we optimize the size of the nanoislands.

  • 3.
    Tian, Jingyi
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Qiu, M.
    Jang, Hoon
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Ferroelectric metasurfaces for THz Wave manipulation2018Inngår i: 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2018, artikkel-id 8427339Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose ferroelectric metasurfaces based on KTiOPO4 and demonstrate the fabrication procedures. It will provide a versatile platform for THz wave manipulation and open up new possibilities to monolithically combine it with THz generation.

  • 4.
    Tian, Jingyi
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Qiu, M.
    Jang, Hoon
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Ferroelectric metasurfaces for THz wave manipulation2018Inngår i: Optics InfoBase Conference Papers, Optical Society of America, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose ferroelectric metasurfaces based on KTiOPO4 and demonstrate the fabrication procedures. It will provide a versatile platform for THz wave manipulation and open up new possibilities to monolithically combine it with THz generation.

  • 5.
    Tian, Jingyi
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik. Zhejiang Univ, Coll Opt Sci & Engn, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China..
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Qiu, Min
    Zhejiang Univ, Coll Opt Sci & Engn, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China.;Westlake Univ, Westlake Inst Adv Study, Inst Adv Technol, Hangzhou 310024, Zhejiang, Peoples R China..
    Jang, Hoon
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Demonstration of terahertz ferroelectric metasurface using a simple and scalable fabrication method2018Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, nr 21, s. 27917-27930Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report on experimental implementation of a ferroelectric metasurface using an x-cut KTiOPO4 (KTP) crystal for efficient manipulation of terahertz (THz) radiation. Based on the multipolar resonances that are accommodated in KTP micro-blocks in a square array, the metasurface is fabricated by precision diamond-blade dicing. Adjusting the size of the KTP micro-blocks to tailor the relative spectral positions of the anisotropic multipolar resonances, we demonstrate a subwavelength-thin THz polarizer that functions as a transparent film in the y-direction and a magnetic mirror in the z-direction with a transmission contrast of 13 dB near 0.37 THz (820 mu m). The ferroelectric-based all-dielectric metasurface will provide a versatile platform to engineer the THz waves in the far field and could potentially be combined with THz generation in the same material.

  • 6.
    Tian, Jingyi
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Yang, Yuanqing
    Qiu, Min
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Jang, Hoon
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    All-dielectric KTiOPO4 metasurfaces based on multipolar resonances in the terahertz region2017Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, nr 20, s. 24068-24080Artikkel i tidsskrift (Fagfellevurdert)
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