Abstract
We demonstrate that the optical response of a single Au bowtie nano-antenna (BNA) can be favorably modified to increase the local intensity by a factor of 103 in the feed gap region when a periodic array of BNAs are used. We use the periodicity of the arrays as an additional degree of freedom in manipulating the optical response and investigate the behavior of the resultant nonlinear emission, which include second harmonic generation (SHG), two-photon photoluminescence (TPPL), and an additional photoluminescence that cannot be attributed to a single multiphoton process. We discuss the effects of the array with respect to the nonlinear emission and also find that the considerable field enhancement of our antenna system leads to a broadband continuum whose spectral response is highly controllable. Resonantly excited arrays of BNAs were seen to exhibit a remarkably uniform emission over 250 nm of the visible spectrum. In addition, our analysis suggests that high field enhancements, as well as resonance matching, may not be the only preconditions for enhanced nonlinear emission. To our knowledge, this is the first report of implementing optical antennas in an array to favorably augment its optical response.
| Original language | English (US) |
|---|---|
| Title of host publication | Photonic and Phononic Properties of Engineered Nanostructures |
| DOIs | |
| State | Published - May 13 2011 |
| Event | Photonic and Phononic Properties of Engineered Nanostructures - San Francisco, CA, United States Duration: Jan 24 2011 → Jan 27 2011 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 7946 |
| ISSN (Print) | 0277-786X |
Other
| Other | Photonic and Phononic Properties of Engineered Nanostructures |
|---|---|
| Country | United States |
| City | San Francisco, CA |
| Period | 1/24/11 → 1/27/11 |
Fingerprint
Keywords
- continuum generation
- field enhancement
- nanoantenna
- Nonlinear optics
- plasmonic nanostructures
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Investigation of the nonlinear optical response from arrays of Au bowtie nanoantennas. / Ko, Kaspar D.; Kumar, Anil; Fung, Kin Hung; Ambekar, Raghu; Liu, Gang Logan; Fang, Nicholas X.; Toussaint, Kimani C.
Photonic and Phononic Properties of Engineered Nanostructures. 2011. 794626 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7946).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Investigation of the nonlinear optical response from arrays of Au bowtie nanoantennas
AU - Ko, Kaspar D.
AU - Kumar, Anil
AU - Fung, Kin Hung
AU - Ambekar, Raghu
AU - Liu, Gang Logan
AU - Fang, Nicholas X.
AU - Toussaint, Kimani C.
PY - 2011/5/13
Y1 - 2011/5/13
N2 - We demonstrate that the optical response of a single Au bowtie nano-antenna (BNA) can be favorably modified to increase the local intensity by a factor of 103 in the feed gap region when a periodic array of BNAs are used. We use the periodicity of the arrays as an additional degree of freedom in manipulating the optical response and investigate the behavior of the resultant nonlinear emission, which include second harmonic generation (SHG), two-photon photoluminescence (TPPL), and an additional photoluminescence that cannot be attributed to a single multiphoton process. We discuss the effects of the array with respect to the nonlinear emission and also find that the considerable field enhancement of our antenna system leads to a broadband continuum whose spectral response is highly controllable. Resonantly excited arrays of BNAs were seen to exhibit a remarkably uniform emission over 250 nm of the visible spectrum. In addition, our analysis suggests that high field enhancements, as well as resonance matching, may not be the only preconditions for enhanced nonlinear emission. To our knowledge, this is the first report of implementing optical antennas in an array to favorably augment its optical response.
AB - We demonstrate that the optical response of a single Au bowtie nano-antenna (BNA) can be favorably modified to increase the local intensity by a factor of 103 in the feed gap region when a periodic array of BNAs are used. We use the periodicity of the arrays as an additional degree of freedom in manipulating the optical response and investigate the behavior of the resultant nonlinear emission, which include second harmonic generation (SHG), two-photon photoluminescence (TPPL), and an additional photoluminescence that cannot be attributed to a single multiphoton process. We discuss the effects of the array with respect to the nonlinear emission and also find that the considerable field enhancement of our antenna system leads to a broadband continuum whose spectral response is highly controllable. Resonantly excited arrays of BNAs were seen to exhibit a remarkably uniform emission over 250 nm of the visible spectrum. In addition, our analysis suggests that high field enhancements, as well as resonance matching, may not be the only preconditions for enhanced nonlinear emission. To our knowledge, this is the first report of implementing optical antennas in an array to favorably augment its optical response.
KW - continuum generation
KW - field enhancement
KW - nanoantenna
KW - Nonlinear optics
KW - plasmonic nanostructures
UR - http://www.scopus.com/inward/record.url?scp=79955776954&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79955776954&partnerID=8YFLogxK
U2 - 10.1117/12.875309
DO - 10.1117/12.875309
M3 - Conference contribution
AN - SCOPUS:79955776954
SN - 9780819484833
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Photonic and Phononic Properties of Engineered Nanostructures
ER -