Department of Physics

Publications

Publications in refereed journals

 

2017 

Imaging Bacterial Colonies and Phage–Bacterium Interaction at Sub-Nanometer Resolution Using Helium-Ion Microscopy
M. LeppänenL.-R. SundbergE. LaantoG. M. de F. AlmeidaP. PapponenI. J. Maasilta 
Adv. Biosys. (2017)

InAs nanowire superconducting tunnel junctions: Quasiparticle spectroscopy, thermometry, and nanorefrigeration
J. Mastomäki, S. Roddaro, M. Rocci, V. Zannier, D. Ercolani, L. Sorba, I. J. Maasilta, N. Ligato, A. Fornieri, E. Strambini, F. Giazotto
Nano Res. (2017)

Beating Darwin-Bragg losses in lab-based ultrafast x-ray experiments
W. K. Fullagar, J. Uhlig, U. Mandal, D. Kurunthu, A. El Nahhas, H.Tatsuno, A. Honarfar, F. Parnefjord Gustaffson, V. Sundström, M. R. J. Palosaari, K. M. Kinnunen, I. J. Maasilta, L. Miaja-Avila, G. C. O’Neil, Y. Il Joe, D. S. Swetz, and J. N. Ullom
Structural Dynamics 4, 044011 
(2017)

Intregrating metallic wiring with three-dimensional polystyrene colloidal crystals using electron-beam lithography and three-dimensional laser lithography
Y. Tian, T. J. Isotalo, M. Konttinen, J. Li, S. Heiskanen, Z. Geng and I. J. Maasilta 
J. Phys. D: Appl. Phys. 50, 055302 (2017)

2016 

Stability, sub-gap current, 1/f-noise, and elemental depth profiling of annealed Al:Mn-AlOX-Al normal metal-insulator-superconducting tunnel junctions
J. K. Julin, S. Chaudhuri, M. Laitinen, T. Sajavaara, and I. J. Maasilta 
AIP Advances 6, 125026 (2016)

Low temperature heat capacity of phononic crystal membranes
T. A. Puurtinen and I. J. Maasilta
AIP Advances 6, 121902 (2016) 

Applications and non-idealities of submicron Al-AlOx-Nb tunnel junctions
J. K. Julin and I. J. Maasilta
Supercond. Sci. Technol. 29, 105003 (2016)

Broadband Ultrahigh-Resolution Spectroscopy of Particle-Induced X Rays: Extending the Limits of Nondestructive Analysis
M. R. J. Palosaari, M. Käyhkö, K. M. Kinnunen, M. Laitinen, J. Julin, J. Malm, T. Sajavaara, W. B. Doriese, J. Fowler, C. Reintsema,
D. Swetz, D. Schmidt, J. N. Ullom, and I. J. Maasilta
Phys. Rev. Applied 6, 024002 (2016)

Low-Temperature Coherent Thermal Conduction in Thin Phononic Crystal Membranes
T. A. Puurtinen and I. J. Maasilta
Crystals  6, 72 (2016)

Phononic Thermal Conduction Engineering for Bolometers: From Phononic Crystals to Radial Casimir Limit 
J. Maasilta, T. A. Puurtinen, Y. Tian, Z. Geng
J. Low Temp. Phys. 184, 211 (2016)

Metal frame as local protection of superconducting films from thermomagnetic avalanches                                                                                         
P. MikheenkoJ. I. Vestgården S. ChaudhuriI. J. MaasiltaY. M. Galperin and T. H. Johansen                                                                                
AIP Advances 6, 035304 (2016)

2015

Ray optics behavior of flux avalanche propagation in superconducting films 
P. Mikheenko, T. H. Johansen, S. Chaudhuri, I. J. Maasilta, and Y. M. Galperin 
Phys. Rev. B 91, 060507(R) (2015)

Normal-Metal–Insulator–Superconductor Tunnel Junction With Atomic-Layer-Deposited Titanium Nitride as Superconductor
A. Torgovkin, S. Chaudhuri, J. Malm, T. Sajavaara, and I. J. Maasilta
IEEE Trans. Appl. Supercond. 25, 1101604 (2015)

Large 256 Pixel X-ray Transition-Edge Sensor Arrays with Mo/TiW/Cu Trilayers
M. R. J. Palosaari, L. Grönberg, K. M. Kinnunen, D. Gunnarsson, M. Prunnila, and I. J. Maasilta
IEEE Trans. Appl. Supercond. 25, 2100304 (2015)

2014

Radial phononic thermal conductance in thin membranes in the Casimir limit: Design guidelines for devices
T. A. Puurtinen and I. J. Maasilta
AIP Advances 4, 124503 (2014)

Heat under the microscope
I. J. Maasilta and A. Minnich
Phys. Today 67, 285-290 (2014)

Microwave nanobolometer based on proximity Josephson junctions
J. Govenius, R. E. Lake, K. Y. Tan, V. Pietilä, J. K. Julin, I. J. Maasilta, P. Virtanen, and M. Möttönen
Phys. Rev. B 90, 064505 (2014)

Transition-Edge Sensors for Particle Induced X-ray Emission Measurements
M. R. J. Palosaari, K. M. Kinnunen, J. Julin, M. Laitinen, M. Napari, T. Sajavaara, W. B. Doriese, J. Fowler, C. Reintsema, D. Swetz, D. Schmidt, J. Ullom and I. J. Maasilta
J. Low Temp. Phys. 176, 285-290 (2014)

Superconducting tantalum nitride-based normal metal-insulator-superconductor tunnel junctions
S. Chaudhuri and I. J. Maasilta
Appl. Phys. Lett. 104, 122601 (2014)

Statistical characterization of self-assembled colloidal crystals by single-step vertical deposition
T. J. Isotalo, Y.-L. Tian, M. P. Konttinen, I. J. Maasilta
Colloids and Surfaces A: Physicochem. Eng. Aspects 443 (2014) 164– 170

Engineering thermal conductance using a two-dimensional phononic crystal
Z. Nobuyuki, T. A. Puurtinen, T. J. Isotalo, S. Chaudhuri and I. J. Maasilta
Nature Communications 5:3435 (2014)

2013

Fabrication of superconducting tantalum nitride thin films using infra-red pulsed laser deposition
S. Chaudhuri, L. Chandernagor, M. Lahtinen, M. Ging, and I. J. Maasilta
J. Vac. Sci. Technol. A, 31, 061502 (2013).

Niobium nitride-based normal metal-insulator-superconductor tunnel junction microthermometer
S. Chaudhuri, M. R. Nevala, and I. J. Maasilta
Appl. Phys. Lett. 102, 132601 (2013)

Table-top ultrafast X-ray microcalorimeter spectrometry for molecular structure
J. Uhlig, W. Fullagar, J. N. Ullom, W. B. Doriese, J. W. Fowler, D. S. Swetz, N. Gador, S. E. Canton, K. Kinnunen, I. J. Maasilta, C.D. Reintsema D.A. Bennett, L.R. Vale, G. C. Hilton, K. D. Irwin, D. R. Schmidt, and V. Sundström
Phys. Rev. Lett. 110, 138302 (2013)

Nanosecond voltage pulses from dendritic flux avalanches in superconducting NbN films
P. Mikheenko, A. J. Qviller, J. I. Vestgården, S. Chaudhuri, I. J. Maasilta, Y. M. Galperin, and T. H. Johansen
Appl. Phys. Lett. 102, 022601 (2013)

 

2012

On calculating the radiated ballistic phonon power in phononic crystal membranes
T. A. Puurtinen and I. J. Maasilta
AIP Conf. Proc. 1506, 9-14 (2012)

Impact of non-idealities on the conductance characteristics of superconductor-insulator-normal metal-insulator-superconductor tunnel junctions
S. Chaudhuri and I. J. Maasilta
J. Phys.: Conf. Ser. 400 042003 (2012)

Development of an Inductive NIS Thermometer
Z. Geng, K. M. Kinnunen and I. J. Maasilta
J. Phys.: Conf. Ser. 400 052005 (2012)

Fabrication and Modelling of Three-Dimensional Sub-kelvin Phononic Crystals
T. J. Isotalo, Y. L. Tian and I. J. Maasilta
J. Phys.: Conf. Ser. 400 052007 (2012)

Complex impedance, responsivity and noise of transition-edge sensors: Analytical solutions for two- and three-block thermal models
I. J. Maasilta
AIP Advances 2, 042110 (2012)

Sub-micron normal-metal/insulator/superconductor tunnel junction thermometer and cooler using Nb
M. R. Nevala, S. Chaudhuri, J. Halkosaari, J. T. Karvonen, and I. J. Maasilta
Appl. Phys. Lett. 101, 112601 (2012)

Normal metal - superconductor decoupling as a source of thermal fluctuation noise in transition-edge sensors
K. M. Kinnunen, M. R. J. Palosaari, I. J. Maasilta
J. Appl. Phys. 112, 034515 (2012)

Analysis of Impedance and Noise Data of an X-Ray Transition-Edge Sensor Using Complex Thermal Models
M. R. J. Palosaari, K. M. Kinnunen, M. L. Ridder, J. van der Kuur, H. F. C. Hoevers and I. J. Maasilta
J. Low Temp. Phys. 167, 129 (2012)

Effect of a Thin AlOx Layer on Transition-Edge Sensor Properties
K. M. Kinnunen, M. R. J. Palosaari and I. J. Maasilta
J. Low Temp. Phys. 167, 141 (2012)

Cooling, conductance and thermometric performance of non-ideal normal metal-superconductor tunnel junction pairs
S. Chaudhuri and I. J. Maasilta
Phys. Rev. B 85, 014519 (2012)

 

2011

Two-dimensional phononic thermal conductance in thin membranes in the Casimir limit
I.J. Maasilta
AIP Advances 1, 041704 (2011)

Temperature Profile for Ballistic and Diffusive Phonon Transport in a Suspended Membrane with a Radially Symmetric Heat Source
J.T. Karvonen, T. Kühn, and I.J. Maasilta
Chin. Journal Phys. 49, 435 (2011)

Infrared Pulsed Laser Deposition of Niobium Nitride Thin Films
S. Chaudhuri, M. R. Nevala, T. Hakkarainen, T. Niemi and I. J. Maasilta
IEEE Transactions on Applied Superconductivity vol. 21, issue 3 (2011) 143

 

2010

Reduction of low-frequency 1/f noise in Al-AlOx-Al tunnel junctions by thermal annealing
J. K. Julin, P. J. Koppinen and I. J. Maasilta
Appl. Phys. Lett. 97, 152501 (2010)

Lab-based ultrafast molecular structure
W. Fullagar, J. Uhlig, N. Gador, K. Kinnunen, I. Maasilta, C.-G. Wahlström, V. Sundström
AIP Conf. Proc. 1234 (2010) 919

Strain sensing with sub-micron sized Al-AlOx-Al tunnel junctions
P. J. Koppinen, J. T. Lievonen, M. Ahlskog, and I. J. Maasilta
Review of Scientific Instruments 81, 023901 (2010)

Irreversibility of the threshold field for dendritic flux avalanches in superconductors
A.J. Qviller, V.V. Yurchenko, K. Eliassen, J.I. Vestgården, T.H. Johansen, M.R. Nevala, I.J. Maasilta, K. Senapati, R.C. Budhani
Physica C 470 (2010) 897–900

 

2009

Phonon cooling of nanomechanical beams with tunnel junctions
P. J. Koppinen and I. J. Maasilta
Phys. Rev. Lett. 102, 165502 (2009)

Effects of Charging Energy on SINIS Tunnel Junction Thermometry
P. J. Koppinen, T. Kühn and I. J. Maasilta
J. Low Temp. Phys. 154, 179 (2009)

Cooling of suspended nanostructures with tunnel junctions
P.J. Koppinen and I. J. Maasilta
J. Phys.: Conf. Series 150, 012025 (2009)

Phonon transport in suspended silicon nitride membranes at low temperatures
J. T. Karvonen, T. Kühn and I. J. Maasilta
J. Phys.: Conf. Series 150, 012019 (2009)

Fabrication and characterization of epitaxial NbN/TaN/NbN Josephson junctions by grown by pulsed laser ablation
M. R. Nevala, I. J. Maasilta, K. Senapati and R. C. Budhani
IEEE Trans. Appl. Supercond., vol. 19, no. 3 (2009) 253

New analysis method for I-V and complex impedance data of transition-edge sensor
I. J. Maasilta and K. M. Kinnunen
AIP Conf. Proc. 1185, (2009) 38

Boundary engineering for SINIS bolometers with integrated tunnel junction coolers
P. J. Koppinen, T. J. Isotalo and I. J. Maasilta
AIP Conf. Proc. 1185, (2009) 318

 

2008

A Transition-Edge Sensor with Two Excess Noise Mechanisms
K. M. Kinnunen, A. K. Nuottajärvi and I. J. Maasilta
J. Low Temp. Phys. 151, (2008) 144.

Reducing Excess Noise in Au/Ti Transition Edge Sensors
K. M. Kinnunen, A. K. Nuottajärvi, J. Leppäniemi and I. J. Maasilta
J. Low Temp. Phys. 151, (2008) 119.

Effect of thin ballistic membranes on transition-edge sensor performance
I. J. Maasilta and T. Kühn
J. Low Temp. Phys. 151, (2008) 64.

 

2007

Tunnel junction based displacement sensing for nanoelectromechanical systems
P. J. Koppinen, J. T. Lievonen, M. E. Ahlskog and I. J. Maasilta
J. Phys.: Conf. Series 92, (2007) 012051

Maximizing phonon thermal conductance for  ballistic  membranes
T. Kühn and I. J. Maasilta
J. Phys.: Conf. Series 92, (2007) 012082

Observation of Phonon Dimensionality Effects on Electron Energy Relaxation
J. T. Karvonen and I. J. Maasilta
J. Phys.: Conf. Series 92, (2007) 012043

Influence of Phonon Dimensionality on Electron Energy Relaxation

J. T. Karvonen and I. J. Maasilta
Phys. Rev. Lett. 99, (2007) 145503

Reentrant stability of superconducting films and the vanishing of dendritic flux instability
V. V. Yurchenko, D. V. Shantsev, M. R. Nevala, I. J. Maasilta, K. Senapati, R. C. Budhani, and T. H. Johansen
Phys. Rev. B 76, (2007) 092504

Optimal operation of transition-edge sensors on ballistic membranes
T. Kühn and I. J. Maasilta
submitted, [cond-mat/0702542]

Complete stabilization and improvement of the characteristics of tunnel junctions by thermal annealing
P. J. Koppinen, L. M. Väistö and I. J. Maasilta
Appl. Phys. Lett. 90, (2007) 053503

Influence of temperature gradients on tunnel junction thermometry below 1 K: cooling and electron-phonon coupling
J. T. Karvonen, L. J. Taskinen and I. J. Maasilta
J. Low Temp. Phys. 146, (2007) 213

 

2006

Improving the performance of hot-electron bolometers and solid state coolers with disordered alloys
L. J. Taskinen and I. J. Maasilta
Appl. Phys. Lett. 89, (2006) 143511

Operation of TES sensors with excess thermal noise
I.J. Maasilta, K. M. Kinnunen, A. K. Nuottajärvi, J. Leppäniemi and A. Luukanen
Supercond. Sci. and Technol. 19, (2006) S242

Direct measurement of sub-Kelvin thermal relaxation rate in nanostructures
I. J. Maasilta and L. J. Taskinen
AIP Conf. Proc. 850, (2006) 1554

Thermal conduction in nanostructures by virtual photons
P. J. Koppinen, J. T. Karvonen, L. J. Taskinen, and I. J. Maasilta
AIP Conf. Proc. 850, (2006) 1556

Effects of annealing to tunnel junction stability
P. J. Koppinen, L. M. Väistö, and I. J. Maasilta
AIP Conf. Proc. 850, (2006) 1639

Optimizing the operating temperature of a transition edge sensor
I. J. Maasilta
Nucl. Instr. and Meth. A 559, (2006) 706

Electron-phonon interaction in a thin Al-Mn film
L. J. Taskinen, J. T. Karvonen and I. J. Maasilta
Nucl. Instr. and Meth. A 559,  (2006) 639

Ballistic phonon transport in dielectric membranes
T. Kuhn and I. J. Maasilta
Nucl. Instr. and Meth. A 559, (2006) 724

 

2005 and older

Observation of disorder-induced weakening of electron-phonon interaction in thin noble-metal films
J. T. Karvonen, L. J. Taskinen and I. J. Maasilta
Phys. Rev. B 72, (2005) 012302

Direct measurement of the electron-phonon relaxation rate in thin copper films
L. J. Taskinen, J. K. Kivioja, J. T. Karvonen, and I. J. Maasilta
Phys. Stat. Solidi (c) 1, (2004) 2856

Electron-phonon interaction in thin copper and gold films
J. T. Karvonen, L. J. Taskinen and I. J. Maasilta
Phys. Stat. Solidi (c) 1, (2004) 2799

Development of SQUID amplifier and ac-biased bolometer for detection of sub-mm radiation
J. Penttilä, A. Virtanen, M. Nevala, K. Kinnunen, A. Luukanen, J. Hassel, M. Kiviranta, P. Helistö, I. Maasilta, H. Seppä
URSI/IEEE XXIX Convention on Radio Science, ed. Manu Lahdes, VTT Symposium 235, pp. 139-142, Espoo 2004.

Fluctuation-limited noise in a superconducting transition-edge sensor
A. Luukanen, K. M. Kinnunen, A. K. Nuottajärvi, H. F. C. Hoevers
W. M. Bergmann Tiest, and J. P. Pekola, Phys. Rev. Lett. 90, 238306 (2003)

Response time of a thermometer based on normal metal-insulator-superconductor (NIS) tunnel junctions
J. M. Kivioja, I. J. Maasilta, J. T. Karvonen, and J. P. Pekola
Physica E: Low-dimensional Systems and Nanostructures 18, 21 (2003)

Publications on other research topics

Modeling electric field sensitive scanning probe measurements for a tip of arbitary shape
I. Kuljanishvili, S. Chakraborty, I. J. Maasilta, S. H. Tessmer, and M. R. Melloch
Ultramicroscopy 102, (2004) 7

Imaging a two-dimensional electron system with a scanning charged probe
S. Chakraborty, I. J. Maasilta, S. H. Tessmer, and M. R. Melloch
Phys. Rev. B 69, (2004) 073308

Direct observation of micron-scale ordered structure in a two-dimensional electron system
I. J. Maasilta, S. Chakraborty, I. Kuljanishvili, S. H. Tessmer, and M. R. Melloch
Phys. Rev. B 68, 205328 (2003)

Tunneling images of a two-dimensional electron system in a quantizing magnetic field
I. J. Maasilta, S. Chakraborty, I. Kuljanishvili, S. H. Tessmer, and M. R. Melloch
Physica E: Low-dimensional Systems and Nanostructures 18, 167 (2003)

High-scan-range cryogenic scanning probe microscope
S. Urahzdin, I. J. Maasilta, S. Chakraborty, I. Moraru and S. H. Tessmer
Rev. Sci. Instrum. 71, 4170 (2000)

Tunneling through a coherent ``Quantum Antidot Molecule''
I. J. Maasilta and V. J. Goldman
Phys. Rev. Lett. 84, 1776 (2000)

Tunneling through a coherent quantum antidot molecule
I. J. Maasilta and V. J. Goldman
Physica B 284-288, 1722 (2000)

Energetics of quantum antidot states in quantum Hall regime
I. J. Maasilta and V. J. Goldman
Phys. Rev. B 57, R4273 (1998)

Line shape of resonant tunneling between fractional quantum Hall edges
I. J. Maasilta and V. J. Goldman
Phys. Rev. B 55, 4081 (1997)

 


Non-refereed publications

 

 

Analysis of i-V and complex impedance data for Ti/Au transition-edge sensors
K. M. Kinnunen, M. R. Palosaari, I. J. Maasilta, M. L. Ridder, J. van der Kuur, and H. F. C. Hoevers
in Extended Abstracts of the 12th International Superconductive Electronics Conference (2009).

DC characteristics of NbN/TaN/NbN Josephson junctions grown by pulsed laser ablation
M. Nevala, I. Maasilta, K. Senapati and R.Budhani
in Extended Abstracts of the 12th International Superconductive Electronics Conference (2009)

Experiments with a superconducting antenna-coupled microbolometer
P. Helistö, H. Sipola, J. S. Penttilä, H. Seppä, K. Kinnunen, M. Nevala, and I. Maasilta
in Extended Abstracts of the 10th International Superconductive Electronics Conference (2005)

Optimal operating temperature and excess noise in TES sensors
I. J. Maasilta, K. M. Kinnunen, A. K. Nuottajärvi, J. Leppäniemi, A. Luukanen and E. N. Grossman
in Extended Abstracts of the 10th International Superconductive Electronics Conference (2005)

Optimizing the operation of transition edge sensors
I. J. Maasilta, K. M. Kinnunen, A. K. Nuottajärvi, T. I. Suppula and A. Luukanen
in Proceedings of the 6th European Workshop on Low Temperature Electronics, ESA publication WPP-227 (2004).

Electrons and phonons at sub-Kelvin temperatures: the role of disorder
I. J. Maasilta, J. T. Karvonen and L. J. Taskinen
in Proceedings of the 6th European Workshop on Low Temperature Electronics, ESA publication WPP-227 (2004) 189

Optimizing the operation of transition edge sensors
I. J. Maasilta, K. M. Kinnunen, A. K. Nuottajärvi, T. I. Suppula and A. Luukanen
in Proceedings of the 6th European Workshop on Low Temperature Electronics, ESA publication WPP-227 (2004) 313

Jyväskylästäkö nanotieteiden keskus?
I. J. Maasilta
Nanoharju viikkokolumni, viikko 40, http://www.nanoharju.fi/ (2004)