Design of quasi-one-dimensional phononic crystal cavity for efficient photoelastic modulation

Kim, Ingi; Iwamoto, Satoshi; Arakawa, Yasuhiko

doi:10.7567/jjap.55.08rd02

Cited by 2 publications

(10 citation statements)

References 30 publications

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“…31,32) In our previous study, we proposed a photoelastic modulator utilizing a quasi-one-dimensional (quasi-1D) PnC cavity and numerically demonstrated an enhanced modulation intensity in the designed quasi-1D PnC cavity structure. 33) Here, we report the experimental demonstration of enhanced photoelastic modulation in a silica-based quasi-1D PnC cavity. The strong reflection of acoustic waves having frequencies within the bandgap in PnCs enables the welllocalized acoustic cavity mode, which enhances the photoelastic modulation of light passing through the cavity region.…”

Section: Introductionmentioning

confidence: 92%

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Enhanced photoelastic modulation in silica phononic crystal cavities

Kim¹,

Iwamoto²,

Arakawa³

2018

Jpn. J. Appl. Phys.

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The enhanced photoelastic modulation in quasi-one-dimensional (1D) phononic crystal (PnC) cavities made of fused silica is experimentally demonstrated. A confined acoustic wave in the cavity can induce a large birefringence through the photoelastic effect and enable larger optical modulation amplitude at the same acoustic power. We observe a phase retardation of ∼26 mrad of light passing through the cavity when the exciting acoustic frequency is tuned to the cavity mode resonance of ∼500 kHz at 2.5 V. In the present experiment, a 16-fold enhancement of retardation in the PnC cavity is demonstrated compared with that in a bar-shaped silica structure. Spatially resolved optical retardation measurement reveals that the large retardation is realized only around the cavity reflecting the localized nature of the acoustic cavity mode. The enhanced interactions between acoustic waves and light can be utilized to improve the performance of acousto-optic devices such as photoelastic modulators.

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Section: Introductionmentioning

confidence: 92%

“…The square cross sections of the blocks provide a wide complete PnBG owing to mode degeneracies. 33) One of the PnC cavities is shown in Fig. 1(c).…”

Section: Sample Structuresmentioning

confidence: 99%

Enhanced photoelastic modulation in silica phononic crystal cavities

Kim¹,

Iwamoto²,

Arakawa³

2018

Jpn. J. Appl. Phys.

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“…Since the peak retardation is proportional to the difference between the amplitude of strain components at each position of the incident light, the spatial distribution of peak retardation reflects the strain fields of the topological elastic waves. 44,45) The spatial distribution of the interface mode was achieved by measuring the peak retardation at different incident positions of the light. The peak retardation distribution was also calculated for comparison with the measurement.…”

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confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This produces time-varied retardation of the light passing through the structure. Since the peak retardation is proportional to the difference between the amplitude of strain components at each position of the incident light, the spatial distribution of peak retardation reflects the strain fields of the topological elastic waves 44,45 .The spatial distribution of the interface mode was achieved by measuring the peak PnBG and demonstrated a highly-confined topological interface state at ~202 kHz with a mechanical Q factor of ~5,650 through the transmission measurement and the photoelastic imaging. To the best of our knowledge, such high quality factor of the topological interface states has not yet been achieved in other topological acoustic/mechanical systems based on 1D PnCs.…”

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confidence: 99%

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Topologically protected elastic waves in one-dimensional phononic crystals of continuous media

Kim¹,

Iwamoto²,

Arakawa³

2017

Appl. Phys. Express

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We report the design of silica-based 1D phononic crystals (PnCs) with topologically distinct complete phononic bandgaps (PnBGs) and the observation of a topologically protected state of elastic waves at their interface. By choosing different structural parameters of unit cells, two PnCs can possess a common PnBG with different topological nature. At the interface between the two PnCs, a topological interface mode with a quality factor of ~5,650 is observed in the PnBG. Spatial confinement of the interface mode is also confirmed by using photoelastic imaging technique. Such topologically protected elastic states are potentially applicable for constructing novel phononic devices. 2 Topological phenomena in quantum Hall, quantum spin Hall systems and topological insulators have been extensively studied in condensed matter physics 1,2 . A hallmark of such phenomena is topologically protected edge states which are robust against defects and imperfection. The presence of the topological edge states is due to topological characters of bulk electronic bands, which is called the bulk-edge correspondence 3,4 . Recently, topological concepts have also been extended to bosonic systems including photonic and phononic structures which support the topologically protected states of light [5][6][7][8][9][10][11][12][13][14][15][16] , acoustic 17-24 and mechanical [25][26][27][28][29][30] waves for various applications. Most of experimental studies in mechanical systems have focused on discrete structures such as coupled pendula 27,28 or granular chains 30 .Although they are useful for describing topological concepts in mechanical systems, continuous solid structures supporting topological elastic waves are highly expected to realize practical high speed phononic applications. In contrast to the intensive theoretical studies of the topological elastic waves [31][32][33][34] , there is a lack of an experimental demonstration in the continuous structures. One of the main challenges is due to high modal densities of elastic waves in continuous-solid structures, preventing the formation of complete PnBGs with topologically distinct properties. Very recently, experimental demonstration of topological elastic waves using continuous structures has been reported 35,36 . However, the structures have only partial phononic bandgap (PnBG) which can cause loss of the topological elastic states by coupling with other propagation modes. Thus, it remains a challenge to realize topological elastic waves in continuous structures with complete PnBGs.To the best of our knowledge, experimental demonstration of topological elastic waves in continuous structures with complete PnBGs is very limited even in one-dimensional (1D) periodic system due to their high modal densities.In this report, we report the experimental realization of topological interface state in solidstructured quasi 1D phononic crystals (PnCs) 37 . In 1D periodic systems, topologically protected edge states are zero-dimensional (0D), localized at the interface between two PnCs...

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Design of quasi-one-dimensional phononic crystal cavity for efficient photoelastic modulation

Cited by 2 publications

References 30 publications

Enhanced photoelastic modulation in silica phononic crystal cavities

Enhanced photoelastic modulation in silica phononic crystal cavities

Topologically protected elastic waves in one-dimensional phononic crystals of continuous media

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