Direct femtosecond pulse compression with miniature-sized Bragg cholesteric liquid crystal

Song, Liying; Fu, Shenhe; Liu, Yikun; Zhou, Jianying; Chigrinov, Vladimir G.; Khoo, Iam Choon

doi:10.1364/ol.38.005040

Cited by 31 publications

(39 citation statements)

References 21 publications

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“…(d) Nematic liquid crystals in nanostructured metamaterial [12]. their electro-optical counterparts that operate at milliseconds speed, several of these optically activated mechanisms can enable ultrafast all-optical switching operations in conjunction with sub-microseconds to nanoseconds and femtoseconds lasers [65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84]. All-optical interactions and activation processes also do not require electrodes or complex circuitry, and can be mediated with a large degree of freedom in the direction and polarization states of the incident electromagnetic waves.…”

Section: F Figures 2(a)-(b)mentioning

confidence: 99%

“…In the next few sections, we shall discuss the fundamentals of these mechanisms and their dynamical characteristics, and explore the possibilities of utilizing them for fast responding all-optical switching and modulation operations. For completeness and possibly new applications, we also include a brief discussion of the ultrafast (femtoseconds) molecular electronic nonlinearities [49,[77][78][79][80][81][82][83][84][85] of NLC, as well as the isotropic (liquid) phase nanoseconds orientation nonlinearities [3,52,53].…”

Section: Mechanisms and Dynamics Of Laser Induced Refractive Index Ormentioning

confidence: 99%

“…Recent studies of CLC (chiral nematic), which basically acts as a 1-D Bragg grating, have shown that because of the grating feedback the nonlinearity can be enhanced by more than 2 orders of magnitude to give n 2 ∼10 −12 -10 −11 for laser wavelength near the band edge of CLC [78]. Such unusually large fast responding electronic nonlinearity has been utilized for efficient direct compression of femtoseconds laser pulses with very thin (a few µm's) CLC cell [79].…”

Section: Isotropic Phase Reorientation and Ultrafast Sub-picoseconds mentioning

confidence: 99%

“…To make the final choice, the details for the chosen mechanisms can be obtained from the discussions in preceding sections and the quoted literatures. Enhanced effect [54-57, 63, 64] Director axis reorientation [3,50,65] Flow-reorientation effect [69] Electrostrictiveeffect [67] Laser induced ordering in liquid phase [52] Molecular electronic Nonlinearity [49,78,79] Photorefractive effect [58][59][60][61][62] Thermal and order parameter [71,[73][74][75][76] Figure 13. NLC director axis-distribution (a) inside a photonic crystal inverse opal [8] and (b) around the nanostructures of a negative permeability metamaterial [12].…”

Section: Multiple Time Scales Nonlinearities Of Nematic Liquid Crystamentioning

confidence: 99%

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MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

Khoo¹,

Zhao²

2014

PIER

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Abstract-We provide a critical account of the dynamics of laser induced refractive index changing mechanisms in nematic liquid crystals which may be useful for all-optical switching and modulation applications in the visible as well as the Terahertz and long-wavelength regime. In particular, the magnitude and response times of optical Kerr effects associated with director axis reorientation, thermal and order parameter changes, coupled flow-reorientation effects and individual molecular electronic responses are thoroughly investigated and documented, along with exemplary experimental demonstrations. Emphases are placed on identifying parameter sets that will enable all-optical switching with much faster response times compared to their conventional electro-optics counterparts.

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Section: F Figures 2(a)-(b)mentioning

confidence: 99%

Section: Mechanisms and Dynamics Of Laser Induced Refractive Index Ormentioning

confidence: 99%

Section: Isotropic Phase Reorientation and Ultrafast Sub-picoseconds mentioning

confidence: 99%

Section: Multiple Time Scales Nonlinearities Of Nematic Liquid Crystamentioning

confidence: 99%

See 2 more Smart Citations

MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

Khoo¹,

Zhao²

2014

PIER

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“…Recently, it has been shown that cholesteric liquid crystals (CLCs), which is a natural BG structure with refractive index modulation depth near 10 −1 [27], can be used to stretch and compress the fs pulses [28]. Importantly, a large nonlinear coefficient in the order of 10 −12 cm 2 /W with femtosecond response was reported in CLCs [27][28][29][30]. These findings open a new avenue to realize optical diode in femtosecond domain.…”

mentioning

confidence: 99%

Femtosecond soliton diode on heterojunction Bragg-grating structure

Deng

Lin

et al. 2016

Applied Physics Letters

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We numerically propose a scheme for realizing an all-optical femtosecond soliton diode based on a tailored heterojunction Bragg grating, which is designed by two spatially asymmetric chirped cholesteric liquid crystals. Our simulations demonstrate that with the consideration of optical nonlinearity, not only the femtosecond diode effect with nonreciprocal transmission ratio up to 120 can be achieved, but also the optical pulse evolving into soliton which maintains its shape during propagation through the sample is observed. Further, the influence of pulse width and the carrier wavelength to the femtosecond diode effect is also discussed in detail. Our demonstrations might suggest a new direction for experimentally realizing the femtosecond soliton diode based on the cholesteric liquid crystals.Diode, which allows the nonreciprocal transportation of electric current, is one of the most important electronic devices in the integrated circuit. In optics, the nonreciprocal effect also plays a significant role in the modern information processing as well as in optically integrated devices. However, optical light beam is usually reciprocal and therefore how to transmit optical signal only in one direction and block that in the opposite direction remains a challenging issue.In the past decades, many schemes were proposed to solve this problem. The most significant proposal was based on the optical isolator realized by the Faraday effect in magneto-optical crystals [1]. Since the magneto-optical isolator requires a strong external pump, it hinders the applications in a highly integrated photonic systems. Other schemes were also reported with different principles or materials such as using optoacoustic effect [ [13,14] and parity-time system [15]. We note that although high nonreciprocal transmission ratio could be achieved using these schemes, the shape of the light field after propagating through the devices is usually neglected. Due to diffraction/dispersion as well as the interaction with materials, the light beam might cannot maintain its profile, which would limit the application in optical processing. Recently, linearly-coupled waveguide system in which the unidirectional propagation are expected in the nonlinear regime [16] was reported. Based on the fiber Bragg grating (FBG), a sandwich structure was proposed to realize optical nonreciprocal effect [17]. * Electronic address: yongyaoli@gmail.comWe should mention that with the consideration of optical nonlinearity, these optical waves [16,17] could maintain their profiles during propagation through the nonlinear devices. Indeed, the light wave propagating though these nonlinear systems is in a form of solitons which can preserve its shape during propagation [18][19][20][21][22][23][24][25].In this Letter, we extend the concept of optical diode from picosecond [17] to femtosecond (fs) domain for the first time, which is of particular interest in the ultrafast data processing. However, the realization of fs diode becomes more difficult than that realized in the pic...

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Nonlinear Optics

2022

Liquid Crystals

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Direct femtosecond pulse compression with miniature-sized Bragg cholesteric liquid crystal

Cited by 31 publications

References 21 publications

MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

MULTIPLE TIME SCALES OPTICAL NONLINEARITIES OF LIQUID CRYSTALS FOR OPTICAL-TERAHERTZ-MICROWAVE APPLICATIONS (Invited Review)

Femtosecond soliton diode on heterojunction Bragg-grating structure

Nonlinear Optics

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