Tunable optical filter having a large dynamic range

Aharon, Ofir; Abdulhalim, Ibrahim

doi:10.1364/ol.34.002114

Cited by 39 publications

(12 citation statements)

References 23 publications

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“…Effort has been devoted to, e.g., sensing the different polarization properties of the incoming light, 25,26 polarization insensitivity, 27 or wider spectral ranges. [28][29][30][31] The main drawback of these Lyot-Ohman filters is the high loss in transmission because of the series of polarizers. In any case, 50% of the light is lost because of the first polarizer.…”

Section: Wavelength Tunable Filtersmentioning

confidence: 99%

Liquid-crystal photonic applications

2011

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Abstract. Liquid crystals are nowadays widely used in all types of display applications. However their unique electro-optic properties also make them a suitable material for nondisplay applications. We will focus on the use of liquid crystals in different photonic components: optical filters and switches, beam-steering devices, spatial light modulators, integrated devices based on optical waveguiding, lasers, and optical nonlinear components. Both the basic operating principles as well as the recent state-of-the art are discussed. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).[ DOI: 10.1117/1.3565046] Subject terms: liquid crystals; photonic applications; review; liquid-crystal lasers; spatial light modulators; tunable lenses; nematicons; optical nonlinearity.Paper 100913SSR received Nov. 5, 2010; revised manuscript received Jan. 11, 2011; accepted for publication Jan. 13, 2011; published online Jun. 14, 2011. IntroductionLiquid crystals (LCs) are organic materials that are liquid but that show a certain degree of ordering (positional and/or orientational). With this definition, many materials can be classified as liquid crystals, but the majority of liquid crystals that are used in photonic applications are of the thermotropic type. Thermotropic means that the liquid-crystal phase exists within a certain temperature interval (in contrast to lyotropic materials for which the material is liquid-crystal within a certain concentration range). Various types of thermotropic liquid-crystal materials exist, and many different mesophases have been discovered in the last decades: nematic, smectic A, smectic C, columnar, blue phases, and many many more. The diversity of liquid-crystal materials is huge, but this diversity is even overshadowed by the number of applications in which liquid crystals are used nowadays. The majority of applications are related to informationdisplay applications. Liquid crystals have conquered the major market share in different display application areas: television screens, laptop screens, screens in mobile phones, etc. Only in projection displays does a tough competitor exist, namely microelectromechanical systems or licenced by Texas Instruments: Digital light processing. Organic light emitting diodes (OLEDs) are the obvious next generation technology that could overtake the LC domination, but today OLED displays have not penetrated the market and only the future will tell if they will. In this review article, we will focus on nondisplay applications, but because we cannot go too broad, we restrict ourselves to photonic applications in which the light is actively manipulated by the LC. In this review article, a certain external influence (surface anchoring, electric fields, optical fields) is used to (re)orient the LC in a certain way. In turn, the LC then changes the light that is propagating through it. Of course, as in every review article, it is impossible to list all the fascinating new scientific results or breakthroughs. Therefore, the authors apologize for not i...

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Section: Wavelength Tunable Filtersmentioning

confidence: 99%

Liquid-crystal photonic applications

2011

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“…For effective frequency separation, multimode filters are used. These are fabricated by creating a cavity of extended size in a Fabry-Perot (FP) resonator, as well as by using cascaded and coupled resonators [17,[29][30][31]. These cascaded structures consist of separate FP filters connected in series.…”

Section: Introductionmentioning

confidence: 99%

“…These cascaded structures consist of separate FP filters connected in series. Changing the optical properties of individual filters does not affect the properties of the neighboring filters [29][30][31]. The use of PhC technology can remarkably improve the tuning capability of individual channels within these filters and optical switches for WDM optical interconnect applications.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Multi-Channel Photonic Crystal Resonators Based on Silicon-On-Insulator With High Quality Factor

et al. 2018

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We have theoretically and experimentally demonstrated a Fabry-Pérot (FP) resonators based on a Si-air one-dimensional photonic crystal (1D PhC) with coupled triple-cavity modes (or defects). These defects are obtained by filling selected air channels in the 1D PhC with an actively reconfigurable fluid. Simulations of the optical properties of these FP resonators were performed in the wide infrared spectral range. It is shown that by changing the refractive index, n c , of the fluid simultaneously in all three channels, a set of narrow triple resonance peaks can be obtained within wide stop-bands of different order in the infrared range. In addition, at certain values of n c , splitting of the triple resonance peaks into a doublet and a single peak with a significantly larger quality factor, Q = 21,200, occurs. Prototype devices based on Silicon-On-Insulator platform were fabricated and characterized by electro-optical and spectroscopic measurements. The electro-optical measurements demonstrate the possibility of refractive index manipulation of the filler in the FP channels individually or simultaneously. Spectroscopic measurements performed in the range 1540-1630 nm using fiber-coupling confirm the presence of triple resonance peaks in the 3rd stop-band in the absence of an electric field applied to the FP channels. At an applied voltage of 10 V to the middle channel, an increase of Q to 3720 in the single peak is registered.

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“…For effective separation of certain frequencies, multimode filters are used that can be obtained by creating a cavity of extended size in a Fabry-Pé rot (FP) resonator, as well as using cascaded and coupled resonators. Cascade structure consist of separate components (FP filters) connected in series, while changing the optical properties of each of them does not affect the properties of the neighboring filters [1][2][3][4][5]. The development of integrated compact multi-channel optical filters for various applications is a rapidly developing area.…”

Section: Introductionmentioning

confidence: 99%

Double-cavity Fabry-Perot resonators based on one-dimensional silicon photonic crystals

Tolmachev

Baldycheva

Perova

2018

AIP Conference Proceedings

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In this work we report on optical properties of Fabry-Pé rot (FP) resonator based on Si-air one-dimensional photonic crystal (1D PC) with coupled double-cavity modes (or defects). These defects obtained by infiltration of the air-cavities of refractive index (n Air ) with the filler of tunable refractive index. In the periodic structure of 1D PC, the filling of two defined grooves with a filler with a refractive index different from n Air leads to the appearance of two resonant modes, the position of which can be adjusted purposefully with changing of n filler. In comparison with (λ / 2) air resonators, the splitting of the doublet increases, which is explained by the increase in the coupling between the resonant modes due to the decrease in reflection R of the internal mirror. The coupled FP resonators design is CMOS compatible and has potential for application in tuning of individual transmission bands in wave-division multiplexing systems as well as for multiple narrow filters in the wide infrared spectral range.

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Tunable optical filter having a large dynamic range

Cited by 39 publications

References 23 publications

Liquid-crystal photonic applications

Liquid-crystal photonic applications

One-Dimensional Multi-Channel Photonic Crystal Resonators Based on Silicon-On-Insulator With High Quality Factor

Double-cavity Fabry-Perot resonators based on one-dimensional silicon photonic crystals

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