PMID- 25836447
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150612
LR  - 20181023
IS  - 1094-4087 (Electronic)
IS  - 1094-4087 (Linking)
VI  - 23
IP  - 4
DP  - 2015 Feb 23
TI  - Ultrafast tunable chirped phase-change metamaterial with a low power.
PG  - 4092-105
LID - 10.1364/OE.23.004092 [doi]
AB  - We numerically demonstrate an all-optical tunable dual-band double negative (DNG) 
      index chirped metamaterial (MM) in the mid-infrared (M-IR) region. This MM 
      possesses an ultrafast and significant tunability under low pump light power, 
      realized by combining phase change material (PCM). It has a configuration of 
      elliptical nanohole array (ENA) penetrating through metal/PCM/metal 
      (Au-Ge(2)Sb(2)Te(5)-Au) films. Here, we consider the case when the chirp is 
      introduced by displacing the positions of the ENA along the short axis of the 
      elliptical apertures inside the primitive cell, which can achieve multiple 
      internal surface-plasmon polariton (SPP) modes at the inner metal-dielectric 
      interfaces of the structure and thus providing a dual-band negative index with 
      simultaneous negative permittivity and permeability. The influence of amorphous 
      and crystalline states of Ge(2)Sb(2)Te(5) on the effective optical parameters of 
      the structure is analyzed. Switching between these states provides a large 
      wavelength shift of the structure's effective optical parameters. A photothermal 
      model is used to study the temporal variation of the temperature of the 
      Ge(2)Sb(2)Te(5) layer to show a potential to switch the phase of Ge(2)Sb(2)Te(5) 
      by optical heating. Generation of the tunable dual-band DNG index presents clear 
      advantages as it possesses a fast tuning time of 0.4 ns, a low pump light 
      intensity of 7.3muW/mum(2), and a large tunable wavelength range of 978 nm. We 
      expect that our design may have potential applications in actively tunable 
      multi-band nanodevices.
FAU - Cao, Tun
AU  - Cao T
FAU - Wei, Chenwei
AU  - Wei C
FAU - Mao, Libang
AU  - Mao L
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Opt Express
JT  - Optics express
JID - 101137103
EDAT- 2015/04/04 06:00
MHDA- 2015/04/04 06:01
CRDT- 2015/04/04 06:00
PHST- 2015/04/04 06:00 [entrez]
PHST- 2015/04/04 06:00 [pubmed]
PHST- 2015/04/04 06:01 [medline]
AID - 311886 [pii]
AID - 10.1364/OE.23.004092 [doi]
PST - ppublish
SO  - Opt Express. 2015 Feb 23;23(4):4092-105. doi: 10.1364/OE.23.004092.