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Publications (6 of 6) Show all publications
Tian, J., Laurell, F., Pasiskevicius, V., Qiu, M. & Jang, H. (2018). Demonstration of terahertz ferroelectric metasurface using a simple and scalable fabrication method. Optics Express, 26(21), 27917-27930
Open this publication in new window or tab >>Demonstration of terahertz ferroelectric metasurface using a simple and scalable fabrication method
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2018 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 21, p. 27917-27930Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-238123 (URN)10.1364/OE.26.027917 (DOI)000447287700086 ()2-s2.0-85055031905 (Scopus ID)
Note

QC 20181120

Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2018-12-07Bibliographically approved
Tian, J., Laurell, F., Pasiskevicius, V., Qiu, M. & Jang, H. (2018). Ferroelectric metasurfaces for THz Wave manipulation. In: 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings: . Paper presented at 2018 Conference on Lasers and Electro-Optics, CLEO 2018, San Jose, United States, 13 May 2018 through 18 May 2018. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8427339.
Open this publication in new window or tab >>Ferroelectric metasurfaces for THz Wave manipulation
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2018 (English)In: 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2018, article id 8427339Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-234875 (URN)2-s2.0-85052564478 (Scopus ID)9781943580422 (ISBN)
Conference
2018 Conference on Lasers and Electro-Optics, CLEO 2018, San Jose, United States, 13 May 2018 through 18 May 2018
Note

QC 20180912

Available from: 2018-09-12 Created: 2018-09-12 Last updated: 2018-09-12Bibliographically approved
Tian, J., Laurell, F., Pasiskevicius, V., Qiu, M. & Jang, H. (2018). Ferroelectric metasurfaces for THz wave manipulation. In: Optics InfoBase Conference Papers: . Paper presented at CLEO: Applications and Technology, CLEO_AT 2018, 13 May 2018 through 18 May 2018. Optical Society of America
Open this publication in new window or tab >>Ferroelectric metasurfaces for THz wave manipulation
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2018 (English)In: Optics InfoBase Conference Papers, Optical Society of America, 2018Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-238342 (URN)10.1364/CLEO_AT.2018.JW2A.82 (DOI)2-s2.0-85049144909 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Applications and Technology, CLEO_AT 2018, 13 May 2018 through 18 May 2018
Note

QC 20181121

Available from: 2018-11-21 Created: 2018-11-21 Last updated: 2018-11-21Bibliographically approved
Kim, H.-M., Jang, H., Pramudita, P., Kim, M.-K. & Lee, Y.-H. (2018). Monolithic integration of self-aligned nanoisland laser with shifted-air-hole waveguide. Optics Express, 26(10), 12569-12578
Open this publication in new window or tab >>Monolithic integration of self-aligned nanoisland laser with shifted-air-hole waveguide
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2018 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 10, p. 12569-12578Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
OPTICAL SOC AMER, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-231221 (URN)10.1364/OE.26.012569 (DOI)000432457600042 ()29801295 (PubMedID)2-s2.0-85047148764 (Scopus ID)
Note

QC 20180628

Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved
Tian, J., Yang, Y., Qiu, M., Laurell, F., Pasiskevicius, V. & Jang, H. (2017). All-dielectric KTiOPO4 metasurfaces based on multipolar resonances in the terahertz region. Optics Express, 25(20), 24068-24080
Open this publication in new window or tab >>All-dielectric KTiOPO4 metasurfaces based on multipolar resonances in the terahertz region
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2017 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 20, p. 24068-24080Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Optical Society of America, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-216615 (URN)10.1364/OE.25.024068 (DOI)000412048500059 ()2-s2.0-85030469912 (Scopus ID)
Note

QC 20171110

Available from: 2017-11-10 Created: 2017-11-10 Last updated: 2018-03-12Bibliographically approved
Pramudita, P., Jang, H., Karnadi, I., Kim, H.-M. & Lee, Y.-H. (2017). Self-aligned nanoislands nanobeam bandedge lasers. Optics Express, 25(6), 6311-6319
Open this publication in new window or tab >>Self-aligned nanoislands nanobeam bandedge lasers
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2017 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 6, p. 6311-6319Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Optical Society of America, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-206293 (URN)10.1364/OE.25.006311 (DOI)000397316200041 ()28380984 (PubMedID)2-s2.0-85015972221 (Scopus ID)
Note

QC 20170509

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2017-11-29Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8450-0779

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