Imaging by silicon on insulator waveguides

Song, Qi; Qian, Feng; Tien, En-Kuang; Tomov, I. V.; Meyer, Jason T.; Sang, Xin Zhu; Boyraz, Özdal

doi:10.1063/1.3141480

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…8, we can estimate the tunability of the radiation pattern for various carrier injection rates. For instance, the normalized far-field pattern magnitude () F  at peak radiation angle, max   , can be estimated in SiO 2 environment by using (5). In a first order approximation, the modified propagation constant in presence of carrier injection can be expressed as…”

Section: Modulation By Carrier Injectionmentioning

confidence: 99%

“…Those kinds of antennas are fabricated in a sub-wavelength dimension and some exceptional physical phenomena, such as super-resolution effect and near-field enhancement [4], are realizable due to the resonant modes. Very directive near-IR optical antennas with electronically controlled beam steering and radiation pattern are the subject of great interest for applications such as planar imaging [5] and LIDAR [6]. The dielectric near-IR antenna consisting of silicon perturbations designed here can be used to transform a guided mode into a leaky mode, thus radiating in a region of space.…”

Section: Introductionmentioning

confidence: 99%

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Silicon-based optical leaky wave antenna with narrow beam radiation

Song¹,

Campione²,

Boyraz³

et al. 2011

Opt. Express

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We propose a design of a dielectric (silicon nitride) optical leaky wave antenna (OLWA) with periodic semiconductor (silicon) corrugations, capable of producing narrow beam radiation. The optical antenna radiates a narrow beam because a leaky wave (LW) with low attenuation constant is excited at one end of the corrugated dielectric waveguide. We show that pointing angle, beam-width, and operational frequency are all related to the LW complex wavenumber, whose value depends on the amount of silicon perturbations in the waveguide. In this paper, the propagation constant and the attenuation coefficient of the LW in the periodic structure are extracted from full-wave simulations. The far-field radiation patterns in both glass and air environments predicted by LW theory agree well with the ones obtained by full-wave simulations. We achieve a directive radiation pattern in glass environment with about 17.5 dB directivity and 1.05 degree beam-width at the operative free space wavelength of 1.55 μm, pointing at a direction orthogonal to the waveguide (broadside direction). We also show that the use of semiconductor corrugations facilitate electronic tuning of the radiation pattern via carrier injection.

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Section: Modulation By Carrier Injectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Silicon-based optical leaky wave antenna with narrow beam radiation

Song¹,

Campione²,

Boyraz³

et al. 2011

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Interesting applications of such narrow beam radiation may include the construction of novel highly directive antennas and the development of future devices such as fast optical switches and sensors. Moreover, very directive near-infrared optical antennas with controlled radiation power density and beam steering are of great need in applications like planar imaging [10] and LIDAR [11].…”

Section: Introductionmentioning

confidence: 99%

Theory of a Directive Optical Leaky Wave Antenna Integrated into a Resonator and Enhancement of Radiation Control

Guclu

Campione

Boyraz

et al. 2014

J. Lightwave Technol.

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Abstract-We provide for the first time the detailed study of the radiation performance of an optical leaky wave antenna (OLWA) integrated into a Fabry-Pérot resonator. We show that the radiation pattern can be expressed as the one generated by the interference of two leaky waves counter-propagating in the resonator leading to a design procedure for achieving optimized broadside radiation, i.e., normal to the waveguide axis. We thus report a realizable implementation of the OLWA made of semiconductor and dielectric regions. The theoretical modeling is supported by full-wave simulation results, which are found to be in good agreement. We aim to control the radiation intensity in the broadside direction via excess carrier generation in the semiconductor regions. We show that the presence of the resonator can provide an effective way of enhancing the radiation level modulation, which reaches values as high as 13.5 dB, paving the way for novel promising control capabilities that might allow the generation of very fast optical switches, as an example.Index Terms-Optical leaky wave antenna; Fabry-Pérot resonator.

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“…Optical antennas have the potential to boost the efficiency of optoelectronic devices [1,2]. For some applications, e.g., planar imaging [3], there is the need of very directive near-IR optical antennas with controlled radiation power density and beam steering. We have recently introduced in [4] a CMOS compatible optical leaky wave antenna (OLWA) that provides directive radiation at 1550 nm, through the excitation of a leaky wave (LW) guided mode [5][6][7] in a dielectric waveguide comprising periodic perturbations made of semiconductors, such as silicon.…”

Section: Introductionmentioning

confidence: 99%

An optical leaky wave antenna with Si perturbations inside a resonator for enhanced optical control of the radiation

Campione¹,

Guclu²,

Song³

et al. 2012

Opt. Express

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We investigate the directive radiation at 1550 nm from an optical leaky wave antenna (OLWA) with semiconductor perturbations made of silicon (Si). We study the radiation pattern dependence on the physical dimensions, number of perturbations and carrier densities in these semiconductor perturbations through optical excitations at a visible wavelength, 625 nm. In this detailed theoretical study we show the correlation between the pump power absorbed in the perturbations, the signal guided in the waveguide and the radiation through leakage. To overcome the limited control of the radiation intensity through excess carrier generation in Si, we present a new design with the OLWA integrated with a Fabry-Pérot resonator (FPR). We provide analytical and numerical studies of the enhanced radiation performance of the OLWA antenna inside the FPR, and derive closed-form formulas accounting for LW reflection at the edges of the FPR. A discussion on the constructive and destructive radiation by the direct and reflected leaky waves in the FPR resonator is provided. Results shown in this paper exhibit 3 dB variation of the radiation and pave the way for further optimization and theoretical developments.

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Imaging by silicon on insulator waveguides

Cited by 12 publications

References 12 publications

Silicon-based optical leaky wave antenna with narrow beam radiation

Silicon-based optical leaky wave antenna with narrow beam radiation

Theory of a Directive Optical Leaky Wave Antenna Integrated into a Resonator and Enhancement of Radiation Control

An optical leaky wave antenna with Si perturbations inside a resonator for enhanced optical control of the radiation

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