Controlling the flow of light with silicon nanostructures

Park, Won

doi:10.1002/lapl.200910122

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…These artificially created crystals demonstrated many unique phenomena which cannot be observed in natural world. Some of the unique phenomena include negative refraction 4-7 , self-collimation [8][9][10] , super-prism 11,12 , strong light confinement 13,14 and slow light 15 , etc. These unique features possess high potential to contribute to the future development of photonics technology.…”

Section: Introductionmentioning

confidence: 99%

Mechanically tunable photonic crystal lens

Cui¹,

Tamma

Lee³

et al. 2010

SPIE Proceedings

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We designed, fabricated and characterized MEMS-enabled mechanically-tunable photonic crystal lens comprised of 2D photonic crystal and symmetrical electro-thermal actuators. The 2D photonic crystal was made of a honeycomb-lattice of 340 nm thick, 260 nm diameter high-index silicon rods embedded in low-index 10 µm thick SU-8 cladding. Silicon input waveguide and deflection block were also fabricated for light in-coupling and monitoring of focused spot size, respectively. When actuated, the electro-thermal actuators induced mechanical strain which changed the lattice constant of the photonic crystal and consequently modified the photonic band structure. This in turn modified the focal-length of the photonic crystal lens. The fabricated device was characterized using a tunable laser (1400~1602 nm) and an infrared camera during actuation. At the wavelength of 1450 nm, the lateral light spot size observed at the deflection block gradually decreased 40%, as applied current increased from 0 to 0.7 A, indicating changes in focal length in response to the mechanical stretching.

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Section: Introductionmentioning

confidence: 99%

Mechanically tunable photonic crystal lens

Cui¹,

Tamma

Lee³

et al. 2010

SPIE Proceedings

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“…Over the past few years, the phenomena of transmission enhancement have been observed when light passes through periodic or aperiodic arrays, sub-wavelength apertures, split rings, self-assembled nanoparticle clusters and coupled nanoholes [13][14][15][16]. Among various geometric shapes, the metal grating has been considered as one of the simplest metal-dielectric structures, which has been studied extensively for many years.…”

Section: Introductionmentioning

confidence: 99%

“…Although many efforts have been made in theoretical and experimental investigations, the physical mechanism for the enhanced optical transmission is still controversial due to their complexity and sensitivity to the shapes, polarization of terahertz (THz) radiation and interpretation methods [17]. Some researchers suggested that the anomalous transmission of gratings arises from the excitation of surface plasmon polaritons (SPPs) [2,4,6,13,16]. Others attributed the extraordinary transmission to the excitation of waveguide mode resonance and considered that the SPPs play a negative role in the transmission of metallic gratings [18,19].…”

Section: Introductionmentioning

confidence: 99%

Control of terahertz transmission through sub-wavelength copper film gratings deposited on RF-4 substrates

et al. 2013

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Low cost terahertz filters (copper gratings) have been fabricated by using plastic substrates and printed circuit board processes. The optical properties of these gratings have been investigated. These sub-wavelength copper film gratings with various periods display remarkably enhanced transmission over the terahertz wavelength range. The maximum amplitude transmission efficiency reaches 86% for the grating with a period of 500 µm. The resonance peaks shift to lower frequencies on increasing the period of the gratings. By analyzing three kinds of models, we demonstrate that the excitation of surface plasmons on the upper and lower interfaces of the grating is the prime mechanism responsible for the extraordinary transmission. Various phase shifts between samples and the bare substrate have been detected, leading to the transmission dip frequencies of our experimental results deviating from the theoretical predictions of a surface plasmon polariton model. In addition, apparent angle-dependent behaviors have been observed in the transmission spectra of the grating with the period of 500 µm and the slit width of 180 µm, which confirms that the copper film grating is a promising geometry for producing terahertz polarizers.

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“…These microstructures can change the properties of silicon material dramatically. 1,2) Particularly, the light absorption property in the infrared range (>0:8 m) can be remarkably enhanced to more than 90%, 3,4) which can be widely utilized in various applications, such as solar cells, 5) terahertz emission, 6) negative refraction of light, 7) and optoelectronic detectors. [8][9][10][11] Therefore, many efforts have been devoted to the fabrication of microstructured silicon with different surface morphologies for the larger photoelectric absorption coefficient, including the laser fluence, 12) pulse width, 13,14) polarization, 15) pulse number, 16) wavelength, 17) ambient gas, 18) and gas pressure.…”

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confidence: 99%

Influence of Femtosecond Laser Pulse Number on Spike Geometry of Microstructured Silicon

Peng

Hong

Zhou

et al. 2013

Appl. Phys. Express

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We experimentally found that there is an approximately linear relation between the average height/interval distance of spikes and the number of injected femtosecond laser pulses for the pulse number below a threshold. The growth rate of the spike height as a function of the irradiated pulse number is dependent on the gas pressure. When the pulse number exceeds the threshold, a hole can be observed on the silicon surface. Furthermore, the depth of the hole increases with the increase of pulse number. These results are important for optimizing the surface microstructure for silicon-based solar cell fabrication.

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Controlling the flow of light with silicon nanostructures

Cited by 5 publications

References 19 publications

Mechanically tunable photonic crystal lens

Mechanically tunable photonic crystal lens

Control of terahertz transmission through sub-wavelength copper film gratings deposited on RF-4 substrates

Influence of Femtosecond Laser Pulse Number on Spike Geometry of Microstructured Silicon

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