Topic
Optical modulator
About: Optical modulator is a research topic. Over the lifetime, 14068 publications have been published within this topic receiving 196932 citations.
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TL;DR: In this article, the authors developed thermo-optic in-line extinction modulators (ILEMs) whose operation is based on the guiding of long-range surface plasmon polaritons (LRSPPs) along metal stripes embedded in polymer and heated by electrical signal currents.
105 citations
TL;DR: In this article, the authors report results of a study on diluted Li+/H+ ion exchange and show that the variation in both the index of refraction and the diffusion coefficient with composition is very nonlinear.
Abstract: Lithium niobate (LiNbO3 is considered to be the leading electrooptical material for fabrication of active waveguides, modulators, and switches for application in integrated optical circuits. LiNbO3 is a ferroelectric material with a high Curie temperature of 1210°C. This is essential to permit rapid diffusion at high temperature, e.g., >1000°C, without domain reversal. Its high electrooptic coefficient allows modulation at relatively low voltages. Waveguides are fabricated in LiNbO3 by Ti indiffusion around 1000°C, by Li2O outdiffusion, and, more recently, by Li+/H+ ion exchange. We report results of a study on diluted Li+/H+ ion exchange. This process is attractive because it allows control of the index change between 0.003 and 0.1 Furthermore, the fabricated waveguides are polarization selective, have high optical damage resistance, and do not exhibit index instability as is the case with complete Li+/H+ exchange. The variation in both the index of refraction and the diffusion coefficient with composition is very nonlinear. Mechanisms contributing to these nonlinear properties are discussed.
105 citations
TL;DR: An agile optically controlled switch or modulator of terahertz (THz) radiation based on a one-dimensional photonic crystal with a GaAs wafer inserted in the middle as a defect layer is presented.
Abstract: We present an agile optically controlled switch or modulator of terahertz (THz) radiation. The element is based on a one-dimensional photonic crystal with a GaAs wafer inserted in the middle as a defect layer. The THz electric field is enhanced in the photonic structure at the surfaces of the GaAs wafer. Excitation of the front GaAs surface by ultrashort 810 nm laser pulses then leads to an efficient modulation of the THz beam even at low photocarrier concentrations (approximately 10(16) cm(-3)). The response time of the element to pulsed photoexcitation is about 130 ps.
104 citations
TL;DR: In this article, an active pulse compression technique that uses integrated electrooptic phase modulators to linearly chirp optical pulses for compression by a dispersive delay line is described.
Abstract: We describe a pulse compression technique that uses integrated electro‐optic phase modulators to linearly chirp optical pulses for compression by a dispersive delay line. In contrast to passive chirp techniques such as self‐phase modulation, this approach of active pulse compression does not depend on the optical power and thus shows promise for application to low‐power solid‐state lasers as an alternative to mode locking for realizing compact picosecond sources. We have demonstrated this technique by compressing the pulses from a mode‐locked neodymium:yttrium aluminum garnet laser from 100 to 45 ps.
104 citations
TL;DR: The transfer characteristics of the MSLM are presented and the addressability and readability of the device and their relationships are discussed theoretically and experimentally from the viewpoint of thedevice structure and performance.
Abstract: The microchannel spatial light modulator (MSLM) is a versatile optically addressed spatial light modulator for optical computing and the optical neural network. In this paper the transfer characteristics of the MSLM are presented. The addressability and readability of the device and their relationships are discussed theoretically and experimentally from the viewpoint of the device structure and performance.
103 citations