Author
D. L. Kwong
Bio: D. L. Kwong is an academic researcher from Agency for Science, Technology and Research. The author has contributed to research in topics: Optical switch & Silicon photonics. The author has an hindex of 3, co-authored 6 publications receiving 126 citations.
Papers
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TL;DR: A nano-opto-mechanical pressure sensor based on nano-scaled ring resonator which agrees with numerical prediction and can be used to form an array structure to detect the pressure distribution in highly accurate measurement with low-cost advantages.
Abstract: This paper reports a nano-opto-mechanical pressure sensor based on nano-scaled ring resonator. The pressure is measured through the output spectrum shift which is induced via mechanical deformation of the ring resonator. The sensitivity as high as 1.47 pm/kPa has been experimentally achieved which agrees with numerical prediction. Due to the strong variation of sensitivity with different ring radius and thickness of the diaphragm, the pressure sensor can be used to form an array structure to detect the pressure distribution in highly accurate measurement with low-cost advantages. The nano-opto-mechanical pressure sensor has potential applications such as shear stress displacement detection, pressure wave detector and pressure mapping etc.
84 citations
TL;DR: In this paper, a nanoscale opto-mechanical actuator driven by gradient optical force is designed and demonstrated, which can achieve a maximum displacement of 67 nm with a response time of 94.5 nm.
Abstract: In this letter, a nanoscale opto-mechanical actuator driven by gradient optical force is designed and demonstrated. The nanoscale actuator can achieve a maximum displacement of 67 nm with a response time of 94.5 ns. The optical force is estimated as 1.01 pN/μm/mW in C-band operating wavelengths. The device is fabricated on silicon-on-insulator wafer using standard dry etching processes. Compared with traditional microelectromechanical systems actuators driven by electrostatic force, the nanoscale opto-mechanical actuator has the advantages of high resolution of actuation, nanoscale displacement, and fast operating speed. It has potential applications in optical signal processing, chemical, and biological sensing.
45 citations
15 Mar 2012
TL;DR: In this article, the authors proposed a nano-optical switch driven by optical force in a laterally coupled double-ring resonator, achieving a switching contrast of more than 25 dB with a switching time of nano-seconds.
Abstract: This paper reports a nano-optical switch driven by optical force in a laterally coupled double-ring resonator. The nano-switch consists of two bus waveguides and a double-ring resonator, with one ring suspended. The circulating power in the double-ring resonator generates strong optical force, leading to deformation of the suspended ring. As a result, a resonance shift at the output leads to the switching operation. In experiment, a switching contrast of more than 25 dB is achieved, with a switching time of nano-seconds. Compared with other reported free-carrier effect and/or silicon-based high speed switches, the proposed switch allows switching operation at low pumping power levels in planar nano-scaled structures.
4 citations
07 Mar 2013
TL;DR: In this article, a tunable metamaterial which rotates the polarized direction up to 20° in the THz regime is presented. But the conversion of electromagnetic wave in one polarized direction to its orthogonal direction is usually quite weak in natural materials.
Abstract: The polarization of electromagnetic (EM) wave plays an essential role in the application of optoelectronics, life science microscopy and photographic display[1]. The conversion of EM wave in one polarized direction to its orthogonal direction is usually quite weak in natural materials. This paper presents a tunable metamaterial which rotates the polarized direction up to 20° in THz regime. The metamaterial can be transformed to its non-superimposable mirror image and tunes the polarization angle, which can be applied as tunable wave plate and optical switch in THz regime.
4 citations
15 Mar 2012
TL;DR: In this article, a nano-actuator is constructed by a special designed nano-scale silicon suspended cantilever which is efficiently driven by the optical gradient force, achieving a tuning range up to 52 nm.
Abstract: In this paper, we demonstrate a nano-actuator using a silicon-based monolithic cavity nano-opto-mechanical system. The nano-actuator is constructed by a special designed nano-scale silicon suspended cantilever which is efficiently driven by the optical gradient force. In experiment, the actuator obtains a tuning range up to 52 nm. The optical power consumption is reduced to 0.04 mW/nm, which is much smaller than typical value of 3mW/nm in optomechanical systems.
3 citations
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TL;DR: This book is very referred for you because it gives not only the experience but also lesson, that's not about who are reading this array signal processing book but about this book that will give wellness for all people from many societies.
Abstract: Where you can find the array signal processing easily? Is it in the book store? On-line book store? are you sure? Keep in mind that you will find the book in this site. This book is very referred for you because it gives not only the experience but also lesson. The lessons are very valuable to serve for you, that's not about who are reading this array signal processing book. It is about this book that will give wellness for all people from many societies.
372 citations
Book•
01 Jan 2006
TL;DR: Theorems and Formulas used in this chapter relate to theorems in optical waveguides and lightwave Circuits that describe the behaviour of Planar Waveguides through the response of the E-modulus effect.
Abstract: Preface 1. Wave Theory of Optical Waveguides 2. Planar Optical Waveguides 3. Optical Fibers 4. Couple Mode Theory 5. Nonlinear Optical Effects in Optical Fibers 6. Finite Element Method 7. Beam Propagation Method 8. Staircase Concatention Method 9. Planar Lightwave Circuits 10. Theorems and Formulas Appendix
359 citations
TL;DR: In this article, the feasibility of the realization of micromachined tunable metamaterials via structure reconfiguration and the current state of the art in the fabrication technologies of structurally reconfigurable metammaterial elements are reviewed.
Abstract: This paper reviews micromachined tunable metamaterials, whereby the tuning capabilities are based on the mechanical reconfiguration of the lattice and/or the metamaterial element geometry. The primary focus of this review is the feasibility of the realization of micromachined tunable metamaterials via structure reconfiguration and the current state of the art in the fabrication technologies of structurally reconfigurable metamaterial elements. The micromachined reconfigurable microstructures not only offer a new tuning method for metamaterials without being limited by the nonlinearity of constituent materials, but also enable a new paradigm of reconfigurable metamaterial-based devices with mechanical actuations. With recent development in nanomachining technology, it is possible to develop structurally reconfigurable metamaterials with faster tuning speed, higher density of integration and more flexible choice of the working frequencies.
284 citations
TL;DR: In this article, the authors introduce the basic physical concepts of cavity optomechanics, and describe some of the most typical experimental cavity optOMEchanical systems for sensing applications, and discuss the noise arising from various sources.
Abstract: The coupling between optical and mechanical degrees of freedom has been of broad interest for a long time. However, it is only until recently, with the rapid development of optical microcavity research, that we are able to manipulate and utilize this coupling process. When a high Q microcavity couples to a mechanical resonator, they can consolidate into an optomechanical system. Benefitting from the unique characteristics offered by optomechanical coupling, this hybrid system has become a promising platform for ultrasensitive sensors to detect displacement, mass, force and acceleration. In this review, we introduce the basic physical concepts of cavity optomechanics, and describe some of the most typical experimental cavity optomechanical systems for sensing applications. Finally, we discuss the noise arising from various sources and show the potentiality of optomechanical sensing towards quantum-noise-limited detection.
78 citations
TL;DR: This paper studies the nonlinear behavior of a nano-optomechanical actuator, consisting of a free-standing arc in a ring resonator that is coupled to a bus waveguide through evanescent waves, which achieves a maximal deflection of 43.1 nm.
Abstract: This paper studies the nonlinear behavior of a nano-optomechanical actuator, consisting of a free-standing arc in a ring resonator that is coupled to a bus waveguide through evanescent waves. The arc deflects when a control light of a fixed wavelength and optical power is pumped into the bus waveguide, while the amount of deflection is monitored by measuring the transmission spectrum of a broadband probe light. This nanoactuator achieves a maximal deflection of 43.1 nm, with a resolution of 0.28 nm. The optical force is a nonlinear function of the deflection of the arc, leading to pull-back instability when the control light is red-tuned. This instability is studied by a combination of experiment and modeling. Potential applications of the nanoactuator include bio-nanomotor, optical switches, and optomechanical memories.
75 citations