Journal publication   
(as of September 2021)

[64] M. G. Joo et al., submitted (2021). 

[63] D. Biswas et al., submitted (2021). 

[62] S. Lee et al., submitted (2021). 

[61] J. Park et al., submitted (2021). 

[60] P. Sang, D. Biswas, S. J. Lee, S. M. Won, D. Son, J. G. Ok, H. J. Park, and H. W. Baac, 

Experimental Demonstration of a Stacked Hybrid Optoacoustic-Piezoelectric Transducer for Localized Heating and Enhanced Cavitation, 

Micromachines 12(10), 1268 (2021). 

https://doi.org/10.3390/mi12101268 

[59] K. Kang, H. Jung, S. An, H. W. Baac, M. Shin, and D. Son, 

Skin-like Transparent Polymer-Hydrogel Hybrid Pressure Sensor with Pyramid Microstructures, 

Polymers 13(19), 3272 (2021). 

https://doi.org/10.3390/polym13193272  

[58] S. H. Kim, G. W. Baek, J. Yoon, S. Seo, D. Hahm, J. H. Chang, D. Seong, H. Seo, S. Oh, K. Kim, H. Jung, Y. Oh, H. W. Baac, B. Alimkhanuly, W. K. Bae, S. Lee, J. Kwak, J.-H. Park, and D. Son, 

A Bioinspired Stretchable Sensory-Neuromorphic System, 

Adv. Mater. 2104690 (2021).

https://doi.org/10.1002/adma.202104690 

[57] M. Joo and H. W. Baac,        

Rigorous Characterization of Fiber-Optic Hydrophone Responses using a Discretized-Domain-Based Rigid-Piston Model and a Broadband Photoacoustic Pulse, 
J. Sound Vib. 512, 116391 (2021)

https://doi.org/10.1016/j.jsv.2021.116391 

[56] M. A. Abbasi, M. Faraz, M. G. Joo, D. Son, S. M. Won, J. G. Ok, H. J. Park, and H. W. Baac, 

Variable-Focus Optoacoustic Lens with Wide Dynamic Range and Long Focal Length by using a Flexible Polymer Nano-Composite Membrane,

Ultrasonics 117, 106545 (2021).

https://doi.org/10.1016/j.ultras.2021.106545 


[55] S. H. Kim, Y. Kim, H. Choi, J. Park, J. H. Song, H. W. Baac,​ M. Shin, J. Kwak, and D. Son, 

Mechanically and electrically durable, stretchable electronic textiles for robust wearable electronics,  

RSC Advances 11, 22327 (2021). 

https://doi.org/10.1039/D1RA03392A

[54] H. Seo, S. I. Han, K.-I. Song, D. Seong, K. Lee, S. H. Kim, T. Park, J. H. Koo, M. Shin, H. W. Baac,​ O. K. Park, S. J. Oh, H.-S. Han, H. Jeon, Y.-C. Kim, D.-H. Kim, T. Hyeon, and D. Son, 

Durable and fatigue-resistant soft peripheral neuroprosthetics for in vivo bidirectional signaling,  

Adv. Mater. 33(20), 2007346 (2021).   

https://doi.org/10.1002/adma.202007346 

[53] D. Jung, K. Kang, H. Jung, D. Seong, S. An, J. Yoon, W. Kim, M. Shin, H. W. Baac, S. Won, C. Shin, and D. Son, 

A Soft Pressure Sensor Array Based on a Conducting Nanomembrane,

Micromachines 12(8), 933 (2021). 

https://doi.org/10.3390/mi12080933 

[52] S. Lee, K. Kang, H. Choi, J. Yoon, Y. Kim, S. An, H. Jung, D. Seong, K. Park, H. W. Baac, and D. Son,        

Soft bio-integrated multifunctional devices using an intrinsically stretchable conducting nanomembrane, 

Appl. Sci. 11, 6562 (2021).   

https://doi.org/10.3390/app11146562  

[51] J. Choi, E. Kamaraj, H. Park, B. H. Jeong, H. W. Baac, S. Park, and H. J. Park,  

Defect-passivation of organometal trihalide perovskite with functionalized organic small molecule for enhanced device performance and stability, 

Dyes Pigm. 189, 109255 (2021).   

https://doi.org/10.1016/j.dyepig.2021.109255  

[50] J. Heo, D. Biswas, K. K. Park, D. Son, H. J. Park, and H. W. Baac,        

Laser-Generated Focused Ultrasound Transducer using a Perforated Photoacoustic Lens for Tissue Characterization,

Biomed. Opt. Express 12(3), 1375 (2021). 

https://doi.org/10.1364/BOE.416884

[49] J. Park, K.-T. Lee, G. Yeon, J. Choi, M. Kim, B. Han, H. W. Baac, L. J. Guo,
and J. G. Ok,       

Demonstration of the One-Step Continuous Fabrication of Flexible Polymer Ridge Waveguides via Nanochannel-Guided Lithography, 

J. Ind. Eng. Chem. 95, 286 (2021). 

https://doi.org/10.1016/j.jiec.2020.12.034

[48] T. Lee, Y. Cheong, H. W. Baac, and L. J. Guo,      

Origin of Gouy Phase Shift Identified by Laser-Generated Focused Ultrasound, 

ACS Photonics 7(11), 3236 (2020). 

https://doi.org/10.1021/acsphotonics.0c01313

[47] S. Lee, J. Lee, H. Park, J. Choi, H. W. Baac, S. Park, and H. J. Park,      

Defect-Passivating Organic/Inorganic Bicomponent Hole-Transport Layer for High Efficiency Metal-Halide Perovskite Device, 

ACS Appl. Mater. Interfaces 12(36), 40310 (2020). 

https://doi.org/10.1021/acsami.0c09784 

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[46] M. Faraz, M. A. Abbasi, P. Sang, D. Son, and H. W. Baac,      

Stretchable and Robust Candle-Soot Nanoparticle-Polydimethylsiloxane Composite Films for Laser-Ultrasound Transmitters, 

Micromachines 11(7), 631 (2020). 

https://doi.org/10.3390/mi11070631

[45] S. Lee, D. Seong, J. Yoon, S. Lee, H. W. Baac, D. Lee, and D. Son,      

A Skin-Conformal, Stretchable, and Breathable Fiducial Marker Patch for Surgical Navigation Systems, 

Micromachines 11(2), 194 (2020). 

https://doi.org/10.3390/mi11020194


[44] D. Biswas, G. C. K. Chen, H. W. Baac, and S. Vasudevan,      

Photoacoustic Spectral Sensing Technique for Diagnosis of Biological Tissue Coagulation: In-Vitro Study, 

Diagnostics 10(3), 133 (2020). 

https://doi.org/10.3390/diagnostics10030133


[43] K.-T. Lee, S. Y. Han, Z. Li, H. W. Baac, and H. J. Park,      

Flexible High-Color-Purity Structural Color Filters Based on a Higher-Order Optical Resonance Suppression, 

Sci. Rep. 9, 14917 (2019).   

https://doi.org/10.1038/s41598-019-51165-1

[42] M. G. Joo, K.-T. Lee, P. Sang, J. Heo, H. J. Park, and H. W. Baac,     

Laser-generated focused ultrasound transmitters with frequency-tuned output over sub-10-MHz range, 

Appl. Phys. Lett. 115(15), 154103 (2019).   

https://doi.org/10.1063/1.5106415

[41] W. Lim, S. Lee, S. Park, and H. W. Baac,     

Differential detachment of intact and viable cells of different sizes using laser-induced microbubbles, 

Biomed. Opt. Express 10(10), 4919 (2019).   

https://doi.org/10.1364/BOE.10.004919

[40] J. Heo, K.-T. Lee, R. K. Kim, and H. W. Baac,     

Side-Polished Fiber-Optic Line Sensor for High-Frequency Broadband Ultrasound Detection, 

Sensors 19(2), 398 (2019).   

https://doi.org/10.3390/s19020398

[39] T. Lee, H. W. Baac, Q. Li, and L. J. Guo,    

Efficient Photoacoustic Conversion in Optical Nanomaterials and Composites, 

Adv. Opt. Mater. 6(24), 1800491 (2018).   

https://doi.org/10.1002/adom.201800491

[38] K.-T. Lee, H. W. Baac, D. H. Park, J. G. Ok, and H. J. Park,

Enhanced Optical Properties of Colored Semitransparent Ultrathin Hybrid Solar Cells Employing Fabry-Perot Etalon with a Dielectric Overlay, 

IEEE Photonics J. 10(6), 8400510 (2018).   

https://doi.org/10.1109/JPHOT.2018.2876397

[37] P. G. Sang, J. Heo, H. J. Park, and H. W. Baac,     

Photoacoustic Energy Sensor for Nanosecond Optical Pulse Measurement, 

Sensors 18(11), 3879 (2018).   

https://doi.org/10.3390/s18113879

[36] K.-T. Lee, D. H. Park, H. W. Baac, and S. Han,    

Graphene- and Carbon-Nanotube-Based Transparent Electrodes for Semitransparent Solar Cells, 

Materials 11(9), 1503 (2018).   

https://doi.org/10.3390/ma11091503     

[35] S. J. Park, J. G. Ok, H. J. Park, K.-T. Lee, J. H. Lee, J. D. Kim, E. Cho, H. W. Baac, S. Kang, L. J. Guo, and A. J. Hart,    

Modulation of the effective density and refractive index of carbon nanotube forests via nanoimprint lithography, 

Carbon 129, 8 (2018).   

https://doi.org/10.1016/j.carbon.2017.11.079

[34] T. Lee, H. W. Baac, J. G. Ok, and L. J. Guo,    

Polymer-Nanomaterial Composites for Optoacoustic Conversion, 

Functional Organic and Hybrid Nanostructured Materials Bookchapter (Wiley-VCH), 519-546 (2018).      

[33] Y.-C. Chen, H. W. Baac, K.-T. Lee, S. Fouladdel, K. Teichert, J. G. Ok, Y.-H. Cheng, P. Ingram, A. J. Hart, E. Azizi, L. J. Guo, M. Wicha, and E. Yoon,  

Selective photo-mechanical detachment and retrieval of divided sister cells from enclosed microfluidics for downstream analyses

ACS Nano 11(5), 4660 (2017). 
https://doi.org/10.1021/acsnano.7b00413
   

[32] X. Wang, W. Cho, H. W. Baac, D. Seo, and I. H. Cho,  

Optimization of double gate vertical channel tunneling field effect transistor (DVTFET) with sidewall dielectric layer, 

J. Semicond. Tech. Sci. 17(2), 192 (2017).  

[31] A. Akter, G. Yoo, S. Kim, H. W. Baac, and J. Heo, 

AlxGa1-xN cladding effect on intraband absorption of InGaN disk embedded in GaN nanowire, 

J. Nanosci. Nanotech. 17(5), 3279 (2017).   

https://doi.org/10.1166/jnn.2017.14060

[30] Y. Park, S. Lee, H. J. Park, H. W. Baac, G. Yoo, and J. Heo, 

Hybrid metal-halide perovskite-MoS2 phototransistor, 

J. Nanosci. Nanotech. 16, 11722 (2016).   

https://doi.org/10.1166/jnn.2016.13581

[29] G. Yoo, Y. Park, P. Sang, H. W. Baac, and J. Heo, 

High-frequency optoacoustic transmitter based on nanostructured germanium via metal-assisted chemical etching, 

Opt. Mater. Express 6, 2567 (2016).   

https://doi.org/10.1364/OME.6.002567

[28] Y. Park, H. W. Baac, G. Yu, and J. Heo, 

Thermally activated trap charges responsible for hysteresis in multilayer MoS2 field-effect transistors, 

Appl. Phys. Lett. 108, 083102 (2016).   

https://doi.org/10.1063/1.4942406

[27] T. Lee, J. G. Ok, L. J. Guo, and H. W. Baac, 

Low f-number photoacoustic lens for tight ultrasonic focusing and free-field micro-cavitation in water, 

Appl. Phys. Lett. 108, 104102 (2016).   

https://doi.org/10.1063/1.4943369

[26] S. Koo, S. H. Lee, J. D. Kim, J. G. Hong, H. W. Baac, M. K. Kwak, and J. G. Ok,  

Controlled airbrush coating of polymer resists in roll-to-roll nanoimprinting with regimented residual layer thickness, 

Int. J. Precis. Eng. Man. 17, 943 (2016).   

https://doi.org/10.1007/s12541-016-0115-8

[25] H. W. Baac, J. G. Ok, T. Lee, and L. J. Guo,

Nano-structural characteristics of carbon nanotube-polymer composite films for high-amplitude optoacoustic generation, 

Nanoscale 7, 14460 (2015). 
https://doi.org/10.1039/C5NR03769G

[24] T. Lee, H. W. Baac, J. G. Ok, H. S. Youn, and L. J. Guo,

Nozzle-free liquid micro-jetting via homogeneous bubble nucleation,

Phys. Rev. Appl. 3, 044007 (2015).   

https://doi.org/10.1103/PhysRevApplied.3.044007

[23] G. Yu, H. Yoon, J. Heo, U. Thakur, H. J. Park, H. W. Baac*, and J. S. Heo*,

All-Optical Ultrasound Transducer using CNT-PDMS and etalon Thin-Film Structure, 

IEEE Photonics J. 7(6), 6803708 (2015).   

https://doi.org/10.1109/JPHOT.2015.2496862 

  

[22] K. Beaudette, H. W. Baac, W.-J. Madore, M. Villiger, N. Godbout, B. E. Bouma, and C. Boudoux,

Double-clad fiber coupler for image-guided laser tissue coagulation,

Biomed. Opt. Express 6(4), 1293 (2015).   

https://doi.org/10.1364/BOE.6.001293 

[21] U. Thakur, B.-G. Kim, S. J. Park, H. W. Baac*, D. Lee*, and H. J. Park*,

Soft-contact printing of nanoparticle-based nanoink for functional nanopatterns, 

J. Nanomater. 723256, 1-6 (2015).
http://dx.doi.org/10.1155/2015/723256 

[20] T. Lee, H. W. Baac, J. G. Ok, H. S. Youn, and L. J. Guo,

Controlled generation of single-microbubble at solid surfaces by a nanosecond pressure pulse,

Phys. Rev. Appl. 2, 024007 (2014).   

https://doi.org/10.1103/PhysRevApplied.2.024007

[19] H. W. Baac, N. Uribe-Patarroyo, and B. E. Bouma, 

High-energy pulsed Raman fiber laser for biological tissue coagulation,

Opt. Express 22(6), 7113 (2014).   

https://doi.org/10.1364/OE.22.007113 

[18] J. G. Ok, J. Y. Lee, H. W. Baac, H. S. Youn, S. H. Tawfick, L. J. Guo, and A. J. Hart,

Rapid anisotropic photoconductive response of ZnO-coated aligned CNT sheets,

ACS Appl. Mater. Interfaces 6(2), 874 (2014).   

https://doi.org/10.1021/am404131r

[17] H. W. Baac, T. Lee, J. G. Ok, T. Hall, and L. J. Guo,

Dual-frequency focused ultrasound using optoacoustic and piezoelectric transmitters for single-pulsed free-field cavitation in water,

Appl. Phys. Lett. 103, 234103 (2013).   

https://doi.org/10.1063/1.4836315

[16] H. W. Baac, T. Lee, and L. J. Guo,

Micro-ultrasonic cleaving of cell clusters by laser-generated focused ultrasound and its mechanisms,

Biomed. Opt. Express 4(8), 1442 (2013).   

https://doi.org/10.1364/BOE.4.001442 

[15] H. W. Baac, J. Frampton, J. G. Ok, S. Takayama, and L. J. Guo,

Localized micro-scale disruption of cells using laser-generated focused ultrasound,

J. Biophoton. 6, 905 (2013).   

https://doi.org/10.1002/jbio.201200247

[14] H. W. Baac, J. G. Ok, A. Maxwell, K.-T. Lee, Y.-C. Chen, A. J. Hart, Z. Xu, E. Yoon, and L. J. Guo,

Carbon-nanotube optoacoustic lens for focused ultrasound generation and high-precision targeted therapy,

Sci. Rep. 2, 989 (2012).   

https://doi.org/10.1038/srep00989

[13] H. Shi, J. G. Ok, H. W. Baac, and L. J. Guo,

Low density carbon nanotube forest as an index-matched and near perfect absorption coating,

Appl. Phys. Lett. 99, 211103 (2011).   

https://doi.org/10.1063/1.3663873 

[12] H. W. Baac, J. G. Ok, H. J. Park, T. Ling, S.-L. Chen, A. J. Hart, and L. J. Guo,

Carbon nanotube composite optoacoustic transmitters for strong and high frequency ultrasound generation,

Appl. Phys. Lett. 97, 234104 (2010).   

https://doi.org/10.1063/1.3522833 

[11] S.-L. Chen, T. Ling, S.-W. Huang, H. W. Baac, and L. J. Guo,

Photoacoustic correlation spectroscopy and its application to low-speed flow measurement,

Opt. Lett. 35(8), 1200 (2010).   

https://doi.org/10.1364/OL.35.001200 

[10] H. W. Baac, T. Ling, S. W. Huang, S. Ashkenazi, and L. J. Guo,

Characterization of optical microring ultrasound detector by using a high frequency focused photoacoustic transmitter,

Appl. Phys. Lett. 95, 144105 (2009).   

https://doi.org/10.1063/1.3243337

[9] S. A. Kim, K. M. Byun, J. Lee, J. H. Kim, D.-G. A. Kim, H. Baac, M. L. Shuler, and S. J. Kim,

Optical measurement of neural activity using surface plasmon resonance,

Opt. Lett. 33(9), 918 (2008).   

https://doi.org/10.1364/OL.33.000914

[8] H. Baac, J. Hajos, J. Lee, D. Kim, S. J. Kim, and M. Shuler,

Antibody-Based Surface Plasmon Resonance Detection of Intact Viral Pathogen,

Biotechnol. Bioeng. 94(4), 815 (2006).   

https://doi.org/10.1002/bit.20882

[7] J. K. Lee, H. Baac, S.-H. Song, E. Jang, S.-D. Lee, D. Park, and S. J. Kim,

Neural prosthesis in the wake of nanotechnology: controlled growth of neurons using surface nano structures,

Acta Neurochirurgica 99, 141 (2006). [non-SCI]   

https://doi.org/10.1007/978-3-211-35205-2_27 

[6] E. Jang, H. Baac, Y.-T. Kim, and S.-D. Lee,

Electrically and Optically Controllable Liquid Crystal Grating with a Patterned Surface-Command Layer,

Mol. Cryst. Liq. Cryst. 293, 453 (2006).   

https://doi.org/10.1080/15421400600653720 

[5] H. Baac, J.-H. Lee, J.-M. Seo, T. H. Park, H. Chung, S.-D. Lee, and S. J. Kim,

Submicron-Scale Topographical Control of Cell Growth using Holographic Surface Relief Grating,

Mat. Sci. Eng. C 24, 209 (2004).   

https://doi.org/10.1016/j.msec.2003.09.009 

[4] E.-T. Kim, S. J. Oh, H. Baac, and S. J. Kim,

Feasibility of Optoelectronic Neural Stimulation shown in Sciatic Nerve of Rats,

J. Biomed. Eng. Res. 25(6), 611 (2004). [domestic; non-SCI]

[3] H. Baac, J.-H. Park, J.-H Lee, S.-D. Lee, S. H. Kang, and D.-H. Choi,

Optical and Electro-Optical Control of Grating Efficiency in a Nematic Liquid Crystal Cell with Azo Polymer Boundary,

Mol. Cryst. Liq. Cryst. 371, 227 (2001).   

https://doi.org/10.1080/10587250108024728

[2] T.-Y. Yoon, H. Baac, and S.-D. Lee,

Optical Properties of a Chiral Liquid Crystal in a Generalized Coupled Mode Formalism,

Mol. Cryst. Liq. Cryst. 371, 203 (2001).   

https://doi.org/10.1080/10587250108024722 

[1] H. Baac, J.-H. Park, J.-H. Lee, S.-D. Lee, S.H. Kang, and D.-H. Choi,

One Beam Controllable Grating in a Liquid Crystal Cell with an Azo Polymer Surface,

Mol. Cryst. Liq. Cryst. 368(5), 403 (2001).   

https://doi.org/10.1080/10587250108029971

US patent (as of Sep 2020)

[2] Seong-Gi Kim, Minah Suh, Chaejeong Heo, Hyoung Won Baac, 

Partial skull replacements capable of monitoring in real time and delivering substances into brain tissue, and uses thereof, 

US Patent 10639397B2 (2020). 

https://patents.google.com/patent/US10639397B2/en

[1] Lingie Jay Guo, Hyoung Won Baac, 

Methods and devices for generating high-amplitude and high-frequency focused ultrasound with light-absorbing materials, 

US Patent 9601103B2 (2017). 

https://patents.google.com/patent/US9601103B2/en