Journal ArticleDOI
Piezoelectric and piezooptic effects in porous silicon
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TLDR
In this article, a silicon wafer was etched into porous material and a shallow layer on the surface of the wafer induced bimorph bending roughly proportional to the voltage squared.Abstract:
Although silicon is a simple cubic crystal, it can be induced to have a piezoelectric response, by making pores in it and thus spoiling its symmetry. By etching a silicon wafer into porous material, we found that it responds to voltage applied to it, as well as to light. A porous shallow layer on the surface of the wafer induced bimorph bending roughly proportional to the voltage squared. Illuminating the porous patch caused a similar bending.read more
Citations
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Patent
Multifunction System and Method for Integrated Hearing and Communication with Noise Cancellation and Feedback Management
TL;DR: In this paper, an ear canal microphone and an external microphone are coupled to a transducer, such that the user perceives sound from the external microphone and the canal microphone with high frequency localization cues and decreased feedback.
Journal ArticleDOI
Fabrication of piezoresistive Si nanorod-based pressure sensor arrays: A promising candidate for portable breath monitoring devices
Ramesh Ghosh,Minho S. Song,Jun-Beom Park,Youngbin Tchoe,Puspendu Guha,Wanhee Lee,Yoonseo Lim,Bosung Kim,Sang-Woo Kim,Miyoung Kim,Gyu-Chul Yi +10 more
TL;DR: In this article, a Si-NR-based piezoresistive sensors exhibited a high sensitivity of 0.49 MPa−1 and a large variation in the current at a constant bias voltage of 2V under a weak applied pressure corresponding to an inert gas flow of 5 sccm. The results can provide direction for the realization of next generation breath-sensing gadgets and other leading-edge applications in the domain of electronic and healthcare devices.
Patent
Optical electro-mechanical hearing devices with separate power and signal components
TL;DR: In this article, a transducer is supported with and configured to vibrate at least one of an eardrum, an ossicle or a cochlea.
Patent
Hearing system having improved high frequency response
Sunil Puria,Rodney C. Perkins +1 more
TL;DR: In this article, the authors presented hearing systems and methods that provide an improved high frequency response, which improves the signal-to-noise ratio of the hearing system and allows for preservation and transmission of high frequency spatial localization cues.
Patent
Optically coupled bone conduction systems and methods
Sunil Puria,Rodney C. Perkins +1 more
TL;DR: In this article, an output transducer assembly is placed on a first side of the user to vibrate a first bone tissue near a first cochlea with a first amount of energy.
References
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Book
Properties of Porous Silicon
Leigh T. Canham,Inspec +1 more
TL;DR: In this paper, the authors present a collection of 50 commissioned essays on the subject from scientists in Europe, America and Japan, with the focus on the luminescence of silicon chips.
Journal ArticleDOI
Thermally induced ultrasonic emission from porous silicon
TL;DR: In this article, the authors show that simple heat conduction from porous silicon to air results in high-intensity ultrasound without the need for any mechanical vibrational system, achieving an acoustic pressure of 0.1
BookDOI
Adaptive Optics Engineering Handbook
TL;DR: In this article, the human eye wide field-of-view (FOV) wavefront sensing was used for compensation for the human-eye wide field of view (WOW) sensing.
Journal ArticleDOI
Bimorph piezoelectric flexible mirror
Ehud Steinhaus,S. G. Lipson +1 more
TL;DR: In this paper, a flexible mirror constructed from plates of glass and lead zirconium titanate (PZT) piezoelectric ceramic glued together is described, which is activated by a series of electrodes on the reverse side.
Journal ArticleDOI
Bimorph adaptive mirrors and curvature sensing.
TL;DR: In this article, the applicability of wave-front correction by means of a bimorph mirror in conjunction with a curvature sensor is described, and the authors use Zernike polynomials to describe the quality of the atmospheric-turbulence correction analytically.