Parity

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Mercedeh Khajavikhan - One of the best experts on this subject based on the ideXlab platform.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    Laser & Photonics Reviews, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Conventional techniques for transverse mode discrimination rely on introducing differential external losses to the different competing mode sets, enforcing single-mode operation at the expense of additional losses to the desirable mode. We show how a Parity-time (PT) symmetric design approach can be employed to achieve single mode lasing in transversely multi-moded microring resonators. In this type of system, mode selectivity is attained by judiciously utilizing the exceptional point dynamics arising from a complex interplay of gain and loss. The proposed scheme is versatile, robust to deviations from PT symmetry such as caused by fabrication inaccuracies or pump inhomogeneities, and enables a stable operation considerably above threshold while maintaining spatial and spectral purity. The experimental results presented here were obtained in InP-based semiconductor microring arrangements and pave the way towards an entirely new class of chip-scale semiconductor lasers that harness gain/loss contrast as a primary mechanism of mode selectivity.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    arXiv: Optics, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Single mode lasing is experimentally demonstrated in a transversely multi-moded InP-based semiconductor microring arrangement. In this system, mode discrimination is attained by judiciously utilizing the exceptional points in a Parity-time (PT) symmetric double microring configuration. The proposed scheme is versatile, robust to small fabrication errors, and enables the device to operate in a stable manner considerably above threshold while maintaining spatial and spectral purity. The results presented here pave the way towards a new class of chip-scale semiconductor lasers that utilize gain/loss contrast as a primary mechanism for mode selection.

  • Parity time symmetric microring lasers
    Science, 2014
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    The ability to control the modes oscillating within a laser resonator is of fundamental importance. In general, the presence of competing modes can be detrimental to beam quality and spectral purity, thus leading to spatial as well as temporal fluctuations in the emitted radiation. We show that by harnessing notions from Parity-time (PT) symmetry, stable single–longitudinal mode operation can be readily achieved in a system of coupled microring lasers. The selective breaking of PT symmetry can be used to systematically enhance the maximum attainable output power in the desired mode. This versatile concept is inherently self-adapting and facilitates mode selectivity over a broad bandwidth without the need for other additional intricate components. Our experimental findings provide the possibility to develop synthetic optical devices and structures with enhanced functionality.

Hossein Hodaei - One of the best experts on this subject based on the ideXlab platform.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    Laser & Photonics Reviews, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Conventional techniques for transverse mode discrimination rely on introducing differential external losses to the different competing mode sets, enforcing single-mode operation at the expense of additional losses to the desirable mode. We show how a Parity-time (PT) symmetric design approach can be employed to achieve single mode lasing in transversely multi-moded microring resonators. In this type of system, mode selectivity is attained by judiciously utilizing the exceptional point dynamics arising from a complex interplay of gain and loss. The proposed scheme is versatile, robust to deviations from PT symmetry such as caused by fabrication inaccuracies or pump inhomogeneities, and enables a stable operation considerably above threshold while maintaining spatial and spectral purity. The experimental results presented here were obtained in InP-based semiconductor microring arrangements and pave the way towards an entirely new class of chip-scale semiconductor lasers that harness gain/loss contrast as a primary mechanism of mode selectivity.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    arXiv: Optics, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Single mode lasing is experimentally demonstrated in a transversely multi-moded InP-based semiconductor microring arrangement. In this system, mode discrimination is attained by judiciously utilizing the exceptional points in a Parity-time (PT) symmetric double microring configuration. The proposed scheme is versatile, robust to small fabrication errors, and enables the device to operate in a stable manner considerably above threshold while maintaining spatial and spectral purity. The results presented here pave the way towards a new class of chip-scale semiconductor lasers that utilize gain/loss contrast as a primary mechanism for mode selection.

  • Parity time symmetric microring lasers
    Science, 2014
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    The ability to control the modes oscillating within a laser resonator is of fundamental importance. In general, the presence of competing modes can be detrimental to beam quality and spectral purity, thus leading to spatial as well as temporal fluctuations in the emitted radiation. We show that by harnessing notions from Parity-time (PT) symmetry, stable single–longitudinal mode operation can be readily achieved in a system of coupled microring lasers. The selective breaking of PT symmetry can be used to systematically enhance the maximum attainable output power in the desired mode. This versatile concept is inherently self-adapting and facilitates mode selectivity over a broad bandwidth without the need for other additional intricate components. Our experimental findings provide the possibility to develop synthetic optical devices and structures with enhanced functionality.

Jie Zhu - One of the best experts on this subject based on the ideXlab platform.

  • unidirectional wave vector manipulation in two dimensional space with an all passive acoustic Parity time symmetric metamaterials crystal
    Physical Review Letters, 2018
    Co-Authors: Tuo Liu, Xuefeng Zhu, Fei Chen, Shanjun Liang, Jie Zhu
    Abstract:

    Exploring the concept of non-Hermitian Hamiltonians respecting Parity-time symmetry with classical wave systems is of great interest as it enables the experimental investigation of Parity-time-symmetric systems through the quantum-classical analogue. Here, we demonstrate unidirectional wave vector manipulation in two-dimensional space, with an all passive acoustic Parity-time-symmetric metamaterials crystal. The metamaterials crystal is constructed through interleaving groove- and holey-structured acoustic metamaterials to provide an intrinsic Parity-time-symmetric potential that is two-dimensionally extended and curved, which allows the flexible manipulation of unpaired wave vectors. At the transition point from the unbroken to broken Parity-time symmetry phase, the unidirectional sound focusing effect (along with reflectionless acoustic transparency in the opposite direction) is experimentally realized over the spectrum. This demonstration confirms the capability of passive acoustic systems to carry the experimental studies on general Parity-time symmetry physics and further reveals the unique functionalities enabled by the judiciously tailored unidirectional wave vectors in space.

Matthias Heinrich - One of the best experts on this subject based on the ideXlab platform.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    Laser & Photonics Reviews, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Conventional techniques for transverse mode discrimination rely on introducing differential external losses to the different competing mode sets, enforcing single-mode operation at the expense of additional losses to the desirable mode. We show how a Parity-time (PT) symmetric design approach can be employed to achieve single mode lasing in transversely multi-moded microring resonators. In this type of system, mode selectivity is attained by judiciously utilizing the exceptional point dynamics arising from a complex interplay of gain and loss. The proposed scheme is versatile, robust to deviations from PT symmetry such as caused by fabrication inaccuracies or pump inhomogeneities, and enables a stable operation considerably above threshold while maintaining spatial and spectral purity. The experimental results presented here were obtained in InP-based semiconductor microring arrangements and pave the way towards an entirely new class of chip-scale semiconductor lasers that harness gain/loss contrast as a primary mechanism of mode selectivity.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    arXiv: Optics, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Single mode lasing is experimentally demonstrated in a transversely multi-moded InP-based semiconductor microring arrangement. In this system, mode discrimination is attained by judiciously utilizing the exceptional points in a Parity-time (PT) symmetric double microring configuration. The proposed scheme is versatile, robust to small fabrication errors, and enables the device to operate in a stable manner considerably above threshold while maintaining spatial and spectral purity. The results presented here pave the way towards a new class of chip-scale semiconductor lasers that utilize gain/loss contrast as a primary mechanism for mode selection.

  • Parity time symmetric microring lasers
    Science, 2014
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    The ability to control the modes oscillating within a laser resonator is of fundamental importance. In general, the presence of competing modes can be detrimental to beam quality and spectral purity, thus leading to spatial as well as temporal fluctuations in the emitted radiation. We show that by harnessing notions from Parity-time (PT) symmetry, stable single–longitudinal mode operation can be readily achieved in a system of coupled microring lasers. The selective breaking of PT symmetry can be used to systematically enhance the maximum attainable output power in the desired mode. This versatile concept is inherently self-adapting and facilitates mode selectivity over a broad bandwidth without the need for other additional intricate components. Our experimental findings provide the possibility to develop synthetic optical devices and structures with enhanced functionality.

Mohammadali Miri - One of the best experts on this subject based on the ideXlab platform.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    Laser & Photonics Reviews, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Conventional techniques for transverse mode discrimination rely on introducing differential external losses to the different competing mode sets, enforcing single-mode operation at the expense of additional losses to the desirable mode. We show how a Parity-time (PT) symmetric design approach can be employed to achieve single mode lasing in transversely multi-moded microring resonators. In this type of system, mode selectivity is attained by judiciously utilizing the exceptional point dynamics arising from a complex interplay of gain and loss. The proposed scheme is versatile, robust to deviations from PT symmetry such as caused by fabrication inaccuracies or pump inhomogeneities, and enables a stable operation considerably above threshold while maintaining spatial and spectral purity. The experimental results presented here were obtained in InP-based semiconductor microring arrangements and pave the way towards an entirely new class of chip-scale semiconductor lasers that harness gain/loss contrast as a primary mechanism of mode selectivity.

  • single mode lasing in transversely multi moded pt symmetric microring resonators
    arXiv: Optics, 2016
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Absar U Hassan, William E Hayenga, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    Single mode lasing is experimentally demonstrated in a transversely multi-moded InP-based semiconductor microring arrangement. In this system, mode discrimination is attained by judiciously utilizing the exceptional points in a Parity-time (PT) symmetric double microring configuration. The proposed scheme is versatile, robust to small fabrication errors, and enables the device to operate in a stable manner considerably above threshold while maintaining spatial and spectral purity. The results presented here pave the way towards a new class of chip-scale semiconductor lasers that utilize gain/loss contrast as a primary mechanism for mode selection.

  • Parity time symmetric microring lasers
    Science, 2014
    Co-Authors: Hossein Hodaei, Mohammadali Miri, Matthias Heinrich, Demetrios N Christodoulides, Mercedeh Khajavikhan
    Abstract:

    The ability to control the modes oscillating within a laser resonator is of fundamental importance. In general, the presence of competing modes can be detrimental to beam quality and spectral purity, thus leading to spatial as well as temporal fluctuations in the emitted radiation. We show that by harnessing notions from Parity-time (PT) symmetry, stable single–longitudinal mode operation can be readily achieved in a system of coupled microring lasers. The selective breaking of PT symmetry can be used to systematically enhance the maximum attainable output power in the desired mode. This versatile concept is inherently self-adapting and facilitates mode selectivity over a broad bandwidth without the need for other additional intricate components. Our experimental findings provide the possibility to develop synthetic optical devices and structures with enhanced functionality.