Mode couplings of a semiconductor nanowire scanning across a photonic crystal nanocavity

Qingchen Yuan; Liang Fang; Qiang Zhao; Yadong Wang; Bo Mao; Vladislav Khayrudinov; Harri Lipsanen; Zhipei Sun; Jianlin Zhao; Xuetao Gan

doi:10.3788/COL201917.062301

Journals >Chinese Optics Letters >Volume 17 >Issue 6 >Page 062301 > Article

Chinese Optics Letters
Vol. 17, Issue 6, 062301 (2019)

Mode couplings of a semiconductor nanowire scanning across a photonic crystal nanocavity | Editors' Pick

Qingchen Yuan¹, Liang Fang¹, Qiang Zhao², Yadong Wang¹, Bo Mao¹, Vladislav Khayrudinov³, Harri Lipsanen³, Zhipei Sun^3、4, Jianlin Zhao^1、*, and Xuetao Gan^1、**

Author Affiliations

¹MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China

²Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, China

³Department of Electronics and Nanoengineering, Aalto University, Espoo, FI-00076, Finland

⁴QTF Centre of Excellence, Department of Applied Physics, Aalto University, Espoo, FI-00076, Finland

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DOI: 10.3788/COL201917.062301 Cite this Article Set citation alerts

Qingchen Yuan, Liang Fang, Qiang Zhao, Yadong Wang, Bo Mao, Vladislav Khayrudinov, Harri Lipsanen, Zhipei Sun, Jianlin Zhao, Xuetao Gan. Mode couplings of a semiconductor nanowire scanning across a photonic crystal nanocavity[J]. Chinese Optics Letters, 2019, 17(6): 062301 Copy Citation Text

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(a) Schematic diagram of an NW scanned across a PPC nanocavity along the lattice’s Γ−M direction. (b) Intensity distribution of the cavity’s fundamental mode. (c) ΣPx, Δλ, and η of the NW-PPC nanocavity versus the NW’s positions. (d) Q factor, Vmode, and ηQ/Vmode of the NW-PPC nanocavity versus the NW’s positions, where the red dashed lines indicate Q0 and Vmode0 of the bare nanocavity.

Fig. 1. (a) Schematic diagram of an NW scanned across a PPC nanocavity along the lattice’s

Γ - M

direction. (b) Intensity distribution of the cavity’s fundamental mode. (c)

Σ P_{x}

Δ λ

, and

η

of the NW-PPC nanocavity versus the NW’s positions. (d)

Q

factor,

V_{mode}

, and

η Q / V_{mode}

of the NW-PPC nanocavity versus the NW’s positions, where the red dashed lines indicate

Q_{0}

and

V_{m ode 0}

of the bare nanocavity.

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Mode intensity profiles and polarizations of electrical fields for NW positions of (a) 0 nm, (b) 180 nm, (c) 360 nm, and (d) 540 nm, where the intensities and polarizations are denoted by the colors and pink arrows.

Fig. 2. Mode intensity profiles and polarizations of electrical fields for NW positions of (a) 0 nm, (b) 180 nm, (c) 360 nm, and (d) 540 nm, where the intensities and polarizations are denoted by the colors and pink arrows.

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Fig. 3. Simulation results when the NW scans along the lattice’s

M - K

direction. (a)

Σ P_{y}

Δ λ

, and

η

of the NW-PPC nanocavity versus the NW’s position. (b)

Q

factor,

V_{mode}

, and

η Q / V_{mode}

of the NW-PPC nanocavity versus the NW’s position, where the red dashed line indicates the

Q_{0}

factor and

V_{mode 0}

of the bare nanocavity. (c1)–(c4) Mode intensity profiles and polarizations of electrical fields when the NW locates at (c1)

y = 0 nm

, (c2) 160 nm, (c3) 280 nm, and (c4) 560 nm, respectively.

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Fig. 4. Simulation results of coupling between the NW and the cavity’s second-order mode. (a) Mode intensity profile (top panel) and polarizations (bottom panel) of the cavity’s second-order mode. (b), (c)

Δ λ

Q

factor,

η

, and

η Q / V_{mode}

of the second-order mode versus the NW position when it is scanned along the (b)

Γ - M

and (c)

M - K

directions. The red dashed line indicates the

Q_{0}

factor of the bare nanocavity.

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Fig. 5. Experiment results of mode couplings in NW-PPC nanocavities when moving the NW along the lattice’s

M - K

direction. (a) AFM images of the NW-PPC nanocavities when the

{Al}_{0.2} {Ga}_{0.8} As

NW is gradually moved close to the cavity center. The scale bar corresponds to 500 nm. (b) The measured (dotted lines) and Lorentzian fitted (solid lines) reflection spectra of the (b1) fundamental and (b2) second-order resonant modes of the NW-PPC nanocavities with different NW positions. (c)

Δ λ

of the (c1) fundamental and (c2) second-order modes versus the NW positions. (d)

Q

factors of the (d1) fundamental and (d2) second-order modes versus the NW positions, where the black (red) dashed lines represent the simulated (measured)