Ultrasensitive switching between resonant reflection and absorption in periodic gratings
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1 Ultrasensitive switching between resonant reflection and absorption in periodic gratings N. Komarevskiy, V. Shklover, L. Braginsky and Ch. Hafner Laboratory for Electromagnetic Fields (IFH), ETH Zurich, Switzerland
2 Guided-Mode Resonance (GMR) loss-free media 2
3 Guided-Mode Resonance (GMR) 100% reflection High Q-factor 3
4 4 Guided-Mode Resonance (GMR) Planar waveguide Corrugated waveguide Waveguide modes Modes folded into 1 st Brillouin zone (empty lattice) Resonance reflection
5 Guided-Mode Resonance (GMR) 5
6 Guided-Mode Resonance (GMR) k E normal incidence d 8; 2.13; sub d 800 nm 6
7 Guided-Mode Resonance (GMR) Silicon carbide N. Komarevskiy, V. Shklover, L. Braginsky, C. Hafner, and J. Lawson, Optics Express, 20, ,
8 Guided-Mode Resonance (GMR) Silicon carbide N. Komarevskiy, V. Shklover, L. Braginsky, C. Hafner, and J. Lawson, Optics Express, 20, ,
9 Guided-Mode Resonance (GMR) 9
10 High Sensitivity to Geometry & Permittivity Changes Sensor applications: biochemistry humidity pressure angle measurements 10
11 Example of Biosensor: Magnusson et al Changes in real part of permittivity were considered! 11
12 Absorption Based Guided-Mode Resonance (AGMR) top interface is the perturbation strength 12
13 Solution in Terms of Plane Waves = 13
14 Effects of Small Losses: High-Q Absorption Resonances negligible spectral shift 14
15 High Angular Sensitivity of AGMR resonances split and may increase in strength 15
16 Linewidth of Reflection/Absorption Resonances exact linear three Fourier harmonics simplified 16
17 Linewidth of Reflection/Absorption Resonances ~ ~ ~ Absorption resonance is wider than reflection However, for small ε the difference is negligible 17
18 Numerical Examples: Hexagonal Lattice Normal incidence loss-free structure N. Komarevskiy, V. Shklover, L. Braginsky and Ch. Hafner, PIER, 139, ,
19 Introduction of losses reflection drops to zero without spectral shift ' ' " negligible spectral shift 19
20 Hexagonal Lattice: Electric Energy Density N. Komarevskiy, V. Shklover, L. Braginsky and Ch. Hafner, PIER, 139, ,
21 Linewidth of Reflection/Absorption Resonances strongly asymmetric symmetric Using FWHM definition, the absorption resonances can be narrower advantageous for sensor applications 21
22 Conversion of 100% Reflection to 100% Absorption 5 optimized parameters: 4 - geometrical 1- material ε N. Komarevskiy, V. Shklover, L. Braginsky and Ch. Hafner, PIER, 139, ,
23 Conversion of 100% Reflection to 100% Absorption ε =0 Re{ E} ε = optimized parameters: 4 - geometrical 1- material ε 23
24 Thin Absorbing Film High Q-factor resonances, Q ~
25 Graphene Monolayer Boundary conditions: Graphene absorption without corrugation is <2% (external fields can modify σ) 25
26 Angular Dependence resonances split and may increase in strength 26
27 Conclusions: Small ε cause absorption-based guided-mode (AGMR) resonances High Q-factor 100 % reflection to 100% absorption conversion Higher sensitivity with respect to ε than to ε High angular sensitivity (peaks split and increase in magnitude) Absorption causes structure heating; temperature detector scheme 27
28 28
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İZMİR INSTITUTE OF TECHNOLOGY GRADUATE SCHOOL OF ENGINEERING AND SCIENCES DEPARTMENT OF PHOTONICS SCIENCE AND ENGINEERING CURRICULUM OF THE
GRADUATE SCHOOL OF AND SCIENCES DEPARTMENT OF PHOTONICS SCIENCE AND The Photonics Science and Engineering PhD Program is a jointly operated interdisciplinary program. The Curriculum is supported by the